midas.cxx

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/********************************************************************\
 
  Name:         MIDAS.C
  Created by:   Stefan Ritt
 
  Contents:     MIDAS main library funcitons
 
  $Id$
 
\********************************************************************/
 
#undef NDEBUG // midas required assert() to be always enabled
 
#include "midas.h"
#include "msystem.h"
#include "git-revision.h"
#include "mstrlcpy.h"
#include "odbxx.h"
 
#include <assert.h>
#include <signal.h>
#include <sys/resource.h>
 
#include <mutex>
#include <deque>
#include <thread>
#include <atomic>
#include <algorithm>
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
/* data type sizes */
static const int tid_size[] = {
        0,   /* tid == 0 not defined                               */
        1,   /* TID_UINT8     unsigned byte         0       255    */
        1,   /* TID_INT8      signed byte         -128      127    */
        1,   /* TID_CHAR      single character      0       255    */
        2,   /* TID_UINT16    two bytes             0      65535   */
        2,   /* TID_INT16     signed word        -32768    32767   */
        4,   /* TID_UINT32    four bytes            0      2^32-1  */
        4,   /* TID_INT32     signed dword        -2^31    2^31-1  */
        4,   /* TID_BOOL      four bytes bool       0        1     */
        4,   /* TID_FLOAT     4 Byte float format                  */
        8,   /* TID_DOUBLE    8 Byte float format                  */
        4,   /* TID_BITFIELD  32 Bits Bitfield    0000... 11111... */
        0,   /* TID_STRING    zero terminated string               */
        0,   /* TID_ARRAY     variable length array of unkown type */
        0,   /* TID_STRUCT    C structure                          */
        0,   /* TID_KEY       key in online database               */
        0,   /* TID_LINK      link in online database              */
        8,   /* TID_INT64     8 bytes int          -2^63   2^63-1  */
        8    /* TID_UINT64    8 bytes unsigned int  0      2^64-1  */
};
 
/* data type names */
static const char *tid_name_old[] = {
        "NULL",
        "BYTE",
        "SBYTE",
        "CHAR",
        "WORD",
        "SHORT",
        "DWORD",
        "INT",
        "BOOL",
        "FLOAT",
        "DOUBLE",
        "BITFIELD",
        "STRING",
        "ARRAY",
        "STRUCT",
        "KEY",
        "LINK",
        "INT64",
        "UINT64"
};
 
static const char *tid_name[] = {
        "NULL",
        "UINT8",
        "INT8",
        "CHAR",
        "UINT16",
        "INT16",
        "UINT32",
        "INT32",
        "BOOL",
        "FLOAT",
        "DOUBLE",
        "BITFIELD",
        "STRING",
        "ARRAY",
        "STRUCT",
        "KEY",
        "LINK",
        "INT64",
        "UINT64"
};
 
std::string cm_transition_name(int transition)
{
   if (transition == TR_START) return "START";
   if (transition == TR_STOP)  return "STOP";
   if (transition == TR_PAUSE) return "PAUSE";
   if (transition == TR_RESUME) return "RESUME";
   if (transition == TR_STARTABORT) return "STARTABORT";
   if (transition == TR_DEFERRED) return "DEFERRED";
   return msprintf("UNKNOWN TRANSITION %d", transition);
}
 
const char *mname[] = {
        "January",
        "February",
        "March",
        "April",
        "May",
        "June",
        "July",
        "August",
        "September",
        "October",
        "November",
        "December"
};
 
/* Globals */
#ifdef OS_MSDOS
extern unsigned _stklen = 60000U;
#endif
 
extern DATABASE *_database;
extern INT _database_entries;
 
//
// locking rules for gBuffers and gBuffersMutex:
//
// - all access to gBuffers must be done while holding gBufferMutex
// - while holding gBufferMutex:
// - taking additional locks not permitted (no calling odb, no locking event buffers, etc)
// - calling functions that can take additional locks not permitted (no calling db_xxx(), bm_xxx(), etc)
// - calling functions that can come back recursively not permitted
//
// after obtaining a BUFFER*pbuf pointer from gBuffers:
//
// - holding gBuffersMutex is not required
// - to access pbuf data, must hold buffer_mutex or call bm_lock_buffer()
// - except for:
//     pbuf->attached - no need to hold a lock (std::atomic)
//     pbuf->buffer_name - no need to hold a lock (constant data, only changed by bm_open_buffer())
//
// object life time:
//
// - gBuffers never shrinks
// - new BUFFER objects are created by bm_open_buffer(), added to gBuffers when ready for use, pbuf->attached set to true
// - bm_close_buffer() sets pbuf->attached to false
// - BUFFER objects are never deleted to avoid race between delete and bm_send_event() & co
// - BUFFER objects are never reused, bm_open_buffer() always creates a new object
// - gBuffers[i] set to NULL are empty slots available for reuse
// - closed buffers have corresponding gBuffers[i]->attached set to false
// 
 
static std::mutex gBuffersMutex; // protects gBuffers vector itself, but not it's contents!
static std::vector<BUFFER*> gBuffers;
 
static INT _msg_buffer = 0;
static EVENT_HANDLER *_msg_dispatch = NULL;
 
/* Event request descriptor */
 
struct EventRequest
{
   INT buffer_handle = 0;            /* Buffer handle */
   short int event_id = 0;           /* same as in EVENT_HEADER */
   short int trigger_mask = 0;       /* same as in EVENT_HEADER */
   EVENT_HANDLER* dispatcher = NULL; /* Dispatcher func. */
 
   void clear()
   {
      buffer_handle = 0;
      event_id = 0;
      trigger_mask = 0;
      dispatcher = NULL;
   }
};
 
static std::mutex _request_list_mutex;
static std::vector<EventRequest> _request_list;
 
//static char *_tcp_buffer = NULL;
//static INT _tcp_wp = 0;
//static INT _tcp_rp = 0;
//static INT _tcp_sock = 0;
 
static MUTEX_T *_mutex_rpc = NULL; // mutex to protect RPC calls
 
static void (*_debug_print)(const char *) = NULL;
 
static INT _debug_mode = 0;
 
static int _rpc_connect_timeout = 10000;
 
// for use on a single machine it is best to restrict RPC access to localhost
// by binding the RPC listener socket to the localhost IP address.
static int disable_bind_rpc_to_localhost = 0;
 
/* table for transition functions */
 
struct TRANS_TABLE {
   INT transition;
   INT sequence_number;
   INT (*func)(INT, char *);
};
 
static std::mutex _trans_table_mutex;
static std::vector<TRANS_TABLE> _trans_table;
 
static TRANS_TABLE _deferred_trans_table[] = {
        {TR_START,  0, NULL},
        {TR_STOP,   0, NULL},
        {TR_PAUSE,  0, NULL},
        {TR_RESUME, 0, NULL},
        {0,         0, NULL}
};
 
static BOOL _rpc_registered = FALSE;
static int _rpc_listen_socket = 0;
 
static INT rpc_transition_dispatch(INT idx, void *prpc_param[]);
 
void cm_ctrlc_handler(int sig);
 
typedef struct {
   INT code;
   const char *string;
} ERROR_TABLE;
 
static const ERROR_TABLE _error_table[] = {
        {CM_WRONG_PASSWORD, "Wrong password"},
        {CM_UNDEF_EXP,      "Experiment not defined"},
        {CM_UNDEF_ENVIRON,
                            "\"exptab\" file not found and MIDAS_DIR or MIDAS_EXPTAB environment variable is not defined"},
        {RPC_NET_ERROR,     "Cannot connect to remote host"},
        {0, NULL}
};
 
typedef struct {
   void *adr;
   int size;
   char file[80];
   int line;
} DBG_MEM_LOC;
 
static DBG_MEM_LOC *_mem_loc = NULL;
static INT _n_mem = 0;
 
struct TR_PARAM
{
   INT transition;
   INT run_number;
   char *errstr;
   INT errstr_size;
   INT async_flag;
   INT debug_flag;
   std::atomic_int status{0};
   std::atomic_bool finished{false};
   std::atomic<std::thread*> thread{NULL};
};
 
static TR_PARAM _trp;
 
/*------------------------------------------------------------------*/
 
void *dbg_malloc(unsigned int size, char *file, int line) {
   FILE *f;
   void *adr;
   int i;
 
   adr = malloc(size);
 
   /* search for deleted entry */
   for (i = 0; i < _n_mem; i++)
      if (_mem_loc[i].adr == NULL)
         break;
 
   if (i == _n_mem) {
      _n_mem++;
      if (!_mem_loc)
         _mem_loc = (DBG_MEM_LOC *) malloc(sizeof(DBG_MEM_LOC));
      else
         _mem_loc = (DBG_MEM_LOC *) realloc(_mem_loc, sizeof(DBG_MEM_LOC) * _n_mem);
   }
 
   assert(_mem_loc != NULL);
 
   _mem_loc[i].adr = adr;
   _mem_loc[i].size = size;
   strcpy(_mem_loc[i].file, file);
   _mem_loc[i].line = line;
 
   f = fopen("mem.txt", "w");
   
   assert(f != NULL);
 
   for (i = 0; i < _n_mem; i++)
      if (_mem_loc[i].adr)
         fprintf(f, "%s:%d size=%d adr=%p\n", _mem_loc[i].file, _mem_loc[i].line, _mem_loc[i].size, _mem_loc[i].adr);
 
   fclose(f);
 
   return adr;
}
 
void *dbg_calloc(unsigned int size, unsigned int count, char *file, int line) {
   void *adr;
 
   adr = dbg_malloc(size * count, file, line);
   if (adr)
      memset(adr, 0, size * count);
 
   return adr;
}
 
void dbg_free(void *adr, char *file, int line) {
   FILE *f;
   int i;
 
   free(adr);
 
   for (i = 0; i < _n_mem; i++)
      if (_mem_loc[i].adr == adr)
         break;
 
   if (i < _n_mem)
      _mem_loc[i].adr = NULL;
 
   f = fopen("mem.txt", "w");
   
   assert(f != NULL);
 
   for (i = 0; i < _n_mem; i++)
      if (_mem_loc[i].adr)
         fprintf(f, "%s:%d %s:%d size=%d adr=%p\n", _mem_loc[i].file, _mem_loc[i].line,
                 file, line, _mem_loc[i].size, _mem_loc[i].adr);
 
   fclose(f);
}
 
static std::vector<std::string> split(const char* sep, const std::string& s)
{
   unsigned sep_len = strlen(sep);
   std::vector<std::string> v;
   std::string::size_type pos = 0;
   while (1) {
      std::string::size_type next = s.find(sep, pos);
      if (next == std::string::npos) {
         v.push_back(s.substr(pos));
         break;
      }
      v.push_back(s.substr(pos, next-pos));
      pos = next+sep_len;
   }
   return v;
}
 
static std::string join(const char* sep, const std::vector<std::string>& v)
{
   std::string s;
 
   for (unsigned i=0; i<v.size(); i++) {
      if (i>0) {
         s += sep;
      }
      s += v[i];
   }
 
   return s;
}
 
bool ends_with_char(const std::string& s, char c)
{
   if (s.length() < 1)
      return false;
   return s[s.length()-1] == c;
}
 
std::string msprintf(const char *format, ...) {
   va_list ap, ap1;
   va_start(ap, format);
   va_copy(ap1, ap);
   size_t size = vsnprintf(nullptr, 0, format, ap1) + 1;
   char *buffer = (char *)malloc(size);
   if (!buffer) {
      va_end(ap);
      va_end(ap1);
      return "";
   }
   vsnprintf(buffer, size, format, ap);
   va_end(ap);
   va_end(ap1);
   std::string s(buffer);
   free(buffer);
   return s;
}
 
/********************************************************************\
*                                                                    *
*              Common message functions                              *
*                                                                    *
\********************************************************************/
 
typedef int (*MessagePrintCallback)(const char *);
 
static std::atomic<MessagePrintCallback> _message_print{puts};
 
static std::atomic_int _message_mask_system{MT_ALL};
static std::atomic_int _message_mask_user{MT_ALL};
 
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
std::string cm_get_error(INT code)
{
   for (int i = 0; _error_table[i].code; i++) {
      if (_error_table[i].code == code) {
         return _error_table[i].string;
      }
   }
 
   return msprintf("unlisted status code %d", code);
}
 
/********************************************************************/
int cm_msg_early_init(void) {
 
   return CM_SUCCESS;
}
 
/********************************************************************/
 
int cm_msg_open_buffer(void) {
   //printf("cm_msg_open_buffer!\n");
   if (_msg_buffer == 0) {
      int status = bm_open_buffer(MESSAGE_BUFFER_NAME, MESSAGE_BUFFER_SIZE, &_msg_buffer);
      if (status != BM_SUCCESS && status != BM_CREATED) {
         return status;
      }
   }
   return CM_SUCCESS;
}
 
/********************************************************************/
 
int cm_msg_close_buffer(void) {
   //printf("cm_msg_close_buffer!\n");
   if (_msg_buffer) {
      bm_close_buffer(_msg_buffer);
      _msg_buffer = 0;
   }
   return CM_SUCCESS;
}
 
/********************************************************************/
 
INT EXPRT cm_msg_facilities(STRING_LIST *list) {
   std::string path;
 
   cm_msg_get_logfile("midas", 0, &path, NULL, NULL);
 
   /* extract directory name from full path name of midas.log */
   size_t pos = path.rfind(DIR_SEPARATOR);
   if (pos != std::string::npos) {
      path.resize(pos);
   } else {
      path = "";
   }
 
   //printf("cm_msg_facilities: path [%s]\n", path.c_str());
 
   STRING_LIST flist;
   
   ss_file_find(path.c_str(), "*.log", &flist);
 
   for (size_t i = 0; i < flist.size(); i++) {
      const char *p = flist[i].c_str();
      if (strchr(p, '_') == NULL && !(p[0] >= '0' && p[0] <= '9')) {
         size_t pos = flist[i].rfind('.');
         if (pos != std::string::npos) {
            flist[i].resize(pos);
         }
         list->push_back(flist[i]);
      }
   }
 
   return SUCCESS;
}
 
/********************************************************************/
 
void cm_msg_get_logfile(const char *fac, time_t t, std::string* filename, std::string* linkname, std::string* linktarget) {
   HNDLE hDB;
   int status;
 
   status = cm_get_experiment_database(&hDB, NULL);
 
   // check for call to cm_msg() before MIDAS is fully initialized
   // or after MIDAS is partially shutdown.
   if (status != CM_SUCCESS) {
      if (filename)
         *filename = std::string(fac) + ".log";
      if (linkname)
         *linkname = "";
      if (linktarget)
         *linktarget = "";
      return;
   }
 
   if (filename)
      *filename = "";
   if (linkname)
      *linkname = "";
   if (linktarget)
      *linktarget = "";
 
   std::string facility;
   if (fac && fac[0])
      facility = fac;
   else
      facility = "midas";
 
   std::string message_format;
   db_get_value_string(hDB, 0, "/Logger/Message file date format", 0, &message_format, TRUE);
   if (message_format.find('%') != std::string::npos) {
      /* replace stings such as %y%m%d with current date */
      struct tm tms;
 
      ss_tzset();
      if (t == 0)
         time(&t);
      localtime_r(&t, &tms);
 
      char de[256];
      de[0] = '_';
      strftime(de + 1, sizeof(de)-1, strchr(message_format.c_str(), '%'), &tms);
      message_format = de;
   }
 
   std::string message_dir;
   db_get_value_string(hDB, 0, "/Logger/Message dir", 0, &message_dir, TRUE);
   if (message_dir.empty()) {
      db_get_value_string(hDB, 0, "/Logger/Data dir", 0, &message_dir, FALSE);
      if (message_dir.empty()) {
         message_dir = cm_get_path();
         if (message_dir.empty()) {
            message_dir = ss_getcwd();
         }
      }
   }
 
   // prepend experiment directory
   if (message_dir[0] != DIR_SEPARATOR)
      message_dir = cm_get_path() + message_dir;
 
   if (message_dir.back() != DIR_SEPARATOR)
      message_dir.push_back(DIR_SEPARATOR);
 
   if (filename)
      *filename = message_dir + facility + message_format + ".log";
   if (!message_format.empty()) {
      if (linkname)
         *linkname = message_dir + facility  + ".log";
      if (linktarget)
         *linktarget = facility  + message_format + ".log";
   }
}
 
/********************************************************************/
INT cm_set_msg_print(INT system_mask, INT user_mask, int (*func)(const char *)) {
   _message_mask_system = system_mask;
   _message_mask_user = user_mask;
   _message_print = func;
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg_log(INT message_type, const char *facility, const char *message) {
   INT status;
 
   if (rpc_is_remote()) {
      if (rpc_is_connected()) {
         status = rpc_call(RPC_CM_MSG_LOG, message_type, facility, message);
         if (status != RPC_SUCCESS) {
            fprintf(stderr, "cm_msg_log: Message \"%s\" not written to midas.log because rpc_call(RPC_CM_MSG_LOG) failed with status %d\n", message, status);
         }
         return status;
      } else {
         fprintf(stderr, "cm_msg_log: Message \"%s\" not written to midas.log, no connection to mserver\n", message);
         return RPC_NET_ERROR;
      }
   }
 
   if (message_type != MT_DEBUG) {
      std::string filename, linkname, linktarget;
 
      cm_msg_get_logfile(facility, 0, &filename, &linkname, &linktarget);
 
#ifdef OS_LINUX
      if (!linkname.empty()) {
         //printf("cm_msg_log: filename [%s] linkname [%s] linktarget [%s]\n", filename.c_str(), linkname.c_str(), linktarget.c_str());
         // If filename does not exist, user just switched from non-date format to date format.
         // In that case we must copy linkname to filename, otherwise messages might get lost.
         if (ss_file_exist(linkname.c_str()) && !ss_file_link_exist(linkname.c_str())) {
            ss_file_copy(linkname.c_str(), filename.c_str(), true);
         }
 
         unlink(linkname.c_str());
         status = symlink(linktarget.c_str(), linkname.c_str());
         if (status != 0) {
            fprintf(stderr,
                    "cm_msg_log: Error: Cannot symlink message log file \'%s' to \'%s\', symlink() errno: %d (%s)\n",
                    linktarget.c_str(), linkname.c_str(), errno, strerror(errno));
         }
      }
#endif
 
      int fh = open(filename.c_str(), O_WRONLY | O_CREAT | O_APPEND | O_LARGEFILE, 0644);
      if (fh < 0) {
         fprintf(stderr,
                 "cm_msg_log: Message \"%s\" not written to midas.log because open(%s) failed with errno %d (%s)\n",
                 message, filename.c_str(), errno, strerror(errno));
      } else {
 
         struct timeval tv;
         struct tm tms;
 
         ss_tzset();
         gettimeofday(&tv, NULL);
         localtime_r(&tv.tv_sec, &tms);
 
         char str[256];
         strftime(str, sizeof(str), "%H:%M:%S", &tms);
         sprintf(str + strlen(str), ".%03d ", (int) (tv.tv_usec / 1000));
         strftime(str + strlen(str), sizeof(str), "%G/%m/%d", &tms);
 
         std::string msg;
         msg += str;
         msg += " ";
         msg += message;
         msg += "\n";
 
         /* avoid c++ complaint about comparison between
            unsigned size_t returned by msg.length() and
            signed ssize_t returned by write() */
         ssize_t len = msg.length();
 
         /* atomic write, no need to take a semaphore */
         ssize_t wr = write(fh, msg.c_str(), len);
 
         if (wr < 0) {
            fprintf(stderr, "cm_msg_log: Message \"%s\" not written to \"%s\", write() error, errno %d (%s)\n", message, filename.c_str(), errno, strerror(errno));
         } else if (wr != len) {
            fprintf(stderr, "cm_msg_log: Message \"%s\" not written to \"%s\", short write() wrote %d instead of %d bytes\n", message, filename.c_str(), (int)wr, (int)len);
         }
 
         close(fh);
      }
   }
 
   return CM_SUCCESS;
}
 
 
static std::string cm_msg_format(INT message_type, const char *filename, INT line, const char *routine, const char *format, va_list *argptr)
{
   /* strip path */
   const char* pc = filename + strlen(filename);
   while (*pc != '\\' && *pc != '/' && pc != filename)
      pc--;
   if (pc != filename)
      pc++;
 
   /* convert type to string */
   std::string type_str;
   if (message_type & MT_ERROR)
      type_str += MT_ERROR_STR;
   if (message_type & MT_INFO)
      type_str += MT_INFO_STR;
   if (message_type & MT_DEBUG)
      type_str += MT_DEBUG_STR;
   if (message_type & MT_USER)
      type_str += MT_USER_STR;
   if (message_type & MT_LOG)
      type_str += MT_LOG_STR;
   if (message_type & MT_TALK)
      type_str += MT_TALK_STR;
 
   std::string message;
 
   /* print client name into string */
   if (message_type == MT_USER)
      message = msprintf("[%s] ", routine);
   else {
      std::string name = rpc_get_name();
      if (name.length() > 0)
         message = msprintf("[%s,%s] ", name.c_str(), type_str.c_str());
      else
         message = "";
   }
 
   /* preceed error messages with file and line info */
   if (message_type == MT_ERROR) {
      message += msprintf("[%s:%d:%s,%s] ", pc, line, routine, type_str.c_str());
   } else if (message_type == MT_USER) {
      message = msprintf("[%s,%s] ", routine, type_str.c_str());
   }
 
   int bufsize = 1024;
   char* buf = (char*)malloc(bufsize);
   assert(buf);
 
   for (int i=0; i<10; i++) {
      va_list ap;
      va_copy(ap, *argptr);
      
      /* print argument list into message */
      int n = vsnprintf(buf, bufsize-1, format, ap);
 
      //printf("vsnprintf [%s] %d %d\n", format, bufsize, n);
 
      va_end(ap);
 
      if (n < bufsize) {
         break;
      }
 
      bufsize += 100;
      bufsize *= 2;
      buf = (char*)realloc(buf, bufsize);
      assert(buf);
   }
 
   message += buf;
   free(buf);
 
   return message;
}
 
static INT cm_msg_send_event(DWORD ts, INT message_type, const char *send_message) {
   //printf("cm_msg_send: ts %d, type %d, message [%s]\n", ts, message_type, send_message);
 
   /* send event if not of type MLOG */
   if (message_type != MT_LOG) {
      if (_msg_buffer) {
         /* copy message to event */
         size_t len = strlen(send_message);
         int event_length = sizeof(EVENT_HEADER) + len + 1;
         char event[event_length];
         EVENT_HEADER *pevent = (EVENT_HEADER *) event;
 
         memcpy(event + sizeof(EVENT_HEADER), send_message, len + 1);
 
         /* setup the event header and send the message */
         bm_compose_event(pevent, EVENTID_MESSAGE, (WORD) message_type, len + 1, 0);
         if (ts)
            pevent->time_stamp = ts;
         //printf("cm_msg_send_event: len %d, header %d, allocated %d, data_size %d, bm_send_event %p+%d\n", (int)len, (int)sizeof(EVENT_HEADER), event_length, pevent->data_size, pevent, (int)(pevent->data_size + sizeof(EVENT_HEADER)));
         bm_send_event(_msg_buffer, pevent, 0, BM_WAIT);
      }
   }
 
   return CM_SUCCESS;
}
 
struct msg_buffer_entry {
   DWORD ts;
   int message_type;
   std::string message;
};
 
static std::deque<msg_buffer_entry> gMsgBuf;
static std::mutex gMsgBufMutex;
 
/********************************************************************/
INT cm_msg_flush_buffer() {
   int i;
 
   //printf("cm_msg_flush_buffer!\n");
 
   for (i = 0; i < 100; i++) {
      msg_buffer_entry e;
      {
         std::lock_guard<std::mutex> lock(gMsgBufMutex);
         if (gMsgBuf.empty())
            break;
         e = gMsgBuf.front();
         gMsgBuf.pop_front();
         // implicit unlock
      }
 
      /* log message */
      cm_msg_log(e.message_type, "midas", e.message.c_str());
 
      /* send message to SYSMSG */
      int status = cm_msg_send_event(e.ts, e.message_type, e.message.c_str());
      if (status != CM_SUCCESS)
         return status;
   }
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg(INT message_type, const char *filename, INT line, const char *routine, const char *format, ...)
{
   DWORD ts = ss_time();
 
   /* print argument list into message */
   std::string message;
   va_list argptr;
   va_start(argptr, format);
   message = cm_msg_format(message_type, filename, line, routine, format, &argptr);
   va_end(argptr);
 
   //printf("message [%s]\n", message.c_str());
 
   /* call user function if set via cm_set_msg_print */
   MessagePrintCallback f = _message_print.load();
   if (f != NULL && (message_type & _message_mask_user) != 0) {
      if (message_type != MT_LOG) { // do not print MLOG messages
         (*f)(message.c_str());
      }
   }
 
   /* return if system mask is not set */
   if ((message_type & _message_mask_system) == 0) {
      return CM_SUCCESS;
   }
 
   gMsgBufMutex.lock();
   gMsgBuf.push_back(msg_buffer_entry{ts, message_type, message});
   gMsgBufMutex.unlock();
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg1(INT message_type, const char *filename, INT line,
            const char *facility, const char *routine, const char *format, ...) {
   va_list argptr;
   std::string message;
   static BOOL in_routine = FALSE;
 
   /* avoid recursive calles */
   if (in_routine)
      return 0;
 
   in_routine = TRUE;
 
   /* print argument list into message */
   va_start(argptr, format);
   message = cm_msg_format(message_type, filename, line, routine, format, &argptr);
   va_end(argptr);
 
   /* call user function if set via cm_set_msg_print */
   MessagePrintCallback f = _message_print.load();
   if (f != NULL && (message_type & _message_mask_user) != 0)
      (*f)(message.c_str());
 
   /* return if system mask is not set */
   if ((message_type & _message_mask_system) == 0) {
      in_routine = FALSE;
      return CM_SUCCESS;
   }
 
   /* send message to SYSMSG */
   cm_msg_send_event(0, message_type, message.c_str());
 
   /* log message */
   cm_msg_log(message_type, facility, message.c_str());
 
   in_routine = FALSE;
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg_register(EVENT_HANDLER *func) {
   INT status, id;
 
   // we should only come here after the message buffer
   // was opened by cm_connect_experiment()
   assert(_msg_buffer);
 
   _msg_dispatch = func;
 
   status = bm_request_event(_msg_buffer, EVENTID_ALL, TRIGGER_ALL, GET_NONBLOCKING, &id, func);
 
   return status;
}
 
static void add_message(char **messages, int *length, int *allocated, time_t tstamp, const char *new_message) {
   int new_message_length = strlen(new_message);
   int new_allocated = 1024 + 2 * ((*allocated) + new_message_length);
   char buf[100];
   int buf_length;
 
   //printf("add_message: new message %d, length %d, new end: %d, allocated: %d, maybe reallocate size %d\n", new_message_length, *length, *length + new_message_length, *allocated, new_allocated);
 
   if (*length + new_message_length + 100 > *allocated) {
      *messages = (char *) realloc(*messages, new_allocated);
      assert(*messages != NULL);
      *allocated = new_allocated;
   }
 
   if (*length > 0)
      if ((*messages)[(*length) - 1] != '\n') {
         (*messages)[*length] = '\n'; // separator between messages
         (*length) += 1;
      }
 
   sprintf(buf, "%ld ", tstamp);
   buf_length = strlen(buf);
   memcpy(&((*messages)[*length]), buf, buf_length);
   (*length) += buf_length;
 
   memcpy(&((*messages)[*length]), new_message, new_message_length);
   (*length) += new_message_length;
   (*messages)[*length] = 0; // make sure string is NUL terminated
}
 
/* Retrieve message from an individual file. Internal use only */
static int cm_msg_retrieve1(const char *filename, time_t t, INT n_messages, char **messages, int *length, int *allocated,
                            int *num_messages) {
   BOOL stop;
   int fh;
   char *p, str[1000];
   struct stat stat_buf;
   time_t tstamp, tstamp_valid, tstamp_last;
 
   ss_tzset(); // required by localtime_r()
 
   *num_messages = 0;
 
   fh = open(filename, O_RDONLY | O_TEXT, 0644);
   if (fh < 0) {
      cm_msg(MERROR, "cm_msg_retrieve1", "Cannot open log file \"%s\", errno %d (%s)", filename, errno,
             strerror(errno));
      return SS_FILE_ERROR;
   }
 
   /* read whole file into memory */
   fstat(fh, &stat_buf);
   ssize_t size = stat_buf.st_size;
 
   /* if file is too big, only read tail of file */
   ssize_t maxsize = 10 * 1024 * 1024;
   if (size > maxsize) {
      lseek(fh, -maxsize, SEEK_END);
      //printf("lseek status %d, errno %d (%s)\n", status, errno, strerror(errno));
      size = maxsize;
   }
 
   char *buffer = (char *) malloc(size + 1);
 
   if (buffer == NULL) {
      cm_msg(MERROR, "cm_msg_retrieve1", "Cannot malloc %d bytes to read log file \"%s\", errno %d (%s)", (int) size,
             filename, errno, strerror(errno));
      close(fh);
      return SS_FILE_ERROR;
   }
 
   ssize_t rd = read(fh, buffer, size);
 
   if (rd != size) {
      cm_msg(MERROR, "cm_msg_retrieve1", "Cannot read %d bytes from log file \"%s\", read() returned %d, errno %d (%s)",
             (int) size, filename, (int) rd, errno, strerror(errno));
      close(fh);
      return SS_FILE_ERROR;
   }
 
   buffer[size] = 0;
   close(fh);
 
   p = buffer + size - 1;
   tstamp_last = tstamp_valid = 0;
   stop = FALSE;
 
   while (*p == '\n' || *p == '\r')
      p--;
 
   int n;
   for (n = 0; !stop && p > buffer;) {
 
      /* go to beginning of line */
      int i;
      for (i = 0; p != buffer && (*p != '\n' && *p != '\r'); i++)
         p--;
 
      /* limit line length to sizeof(str) */
      if (i >= (int) sizeof(str))
         i = sizeof(str) - 1;
 
      if (p == buffer) {
         i++;
         memcpy(str, p, i);
      } else
         memcpy(str, p + 1, i);
      str[i] = 0;
      if (strchr(str, '\n'))
         *strchr(str, '\n') = 0;
      if (strchr(str, '\r'))
         *strchr(str, '\r') = 0;
      mstrlcat(str, "\n", sizeof(str));
 
      // extract time tag
      time_t now;
      time(&now);
 
      struct tm tms;
      localtime_r(&now, &tms); // must call tzset() beforehand!
 
      if (str[0] >= '0' && str[0] <= '9') {
         // new format
         tms.tm_hour = atoi(str);
         tms.tm_min = atoi(str + 3);
         tms.tm_sec = atoi(str + 6);
         tms.tm_year = atoi(str + 13) - 1900;
         tms.tm_mon = atoi(str + 18) - 1;
         tms.tm_mday = atoi(str + 21);
      } else {
         // old format
         tms.tm_hour = atoi(str + 11);
         tms.tm_min = atoi(str + 14);
         tms.tm_sec = atoi(str + 17);
         tms.tm_year = atoi(str + 20) - 1900;
         for (i = 0; i < 12; i++)
            if (strncmp(str + 4, mname[i], 3) == 0)
               break;
         tms.tm_mon = i;
         tms.tm_mday = atoi(str + 8);
      }
      tstamp = ss_mktime(&tms);
      if (tstamp != -1)
         tstamp_valid = tstamp;
 
      // for new messages (n=0!), stop when t reached
      if (n_messages == 0) {
         if (tstamp_valid < t)
            break;
      }
 
      // for old messages, stop when all messages belonging to tstamp_last are sent
      if (n_messages != 0) {
         if (tstamp_last > 0 && tstamp_valid < tstamp_last)
            break;
      }
 
      if (t == 0 || tstamp == -1 ||
          (n_messages > 0 && tstamp <= t) ||
          (n_messages == 0 && tstamp >= t)) {
 
         n++;
 
         add_message(messages, length, allocated, tstamp, str);
      }
 
      while (*p == '\n' || *p == '\r')
         p--;
 
      if (n_messages == 1)
         stop = TRUE;
      else if (n_messages > 1) {
         // continue collecting messages until time stamp differs from current one
         if (n == n_messages)
            tstamp_last = tstamp_valid;
 
         // if all messages without time tags, just return after n
         if (n == n_messages && tstamp_valid == 0)
            break;
      }
   }
 
   free(buffer);
 
   *num_messages = n;
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg_retrieve2(const char *facility, time_t t, INT n_message, char **messages, int *num_messages) {
   std::string filename, linkname;
   INT n, i;
   time_t filedate;
   int length = 0;
   int allocated = 0;
 
   time(&filedate);
   cm_msg_get_logfile(facility, filedate, &filename, &linkname, NULL);
 
   //printf("facility %s, filename \"%s\" \"%s\"\n", facility, filename, linkname);
 
   // see if file exists, use linkname if not
   if (!linkname.empty()) {
      if (!ss_file_exist(filename.c_str()))
         filename = linkname;
   }
 
   if (ss_file_exist(filename.c_str())) {
      cm_msg_retrieve1(filename.c_str(), t, n_message, messages, &length, &allocated, &n);
   } else {
      n = 0;
   }
 
   /* if there is no symlink, then there is no additional log files to read */
   if (linkname.empty()) {
      *num_messages = n;
      return CM_SUCCESS;
   }
 
   //printf("read more messages %d %d!\n", n, n_message);
 
   int missing = 0;
   while (n < n_message) {
      filedate -= 3600 * 24;         // go one day back
 
      cm_msg_get_logfile(facility, filedate, &filename, NULL, NULL);
 
      //printf("read [%s] for time %d!\n", filename.c_str(), filedate);
 
      if (ss_file_exist(filename.c_str())) {
         cm_msg_retrieve1(filename.c_str(), t, n_message - n, messages, &length, &allocated, &i);
         n += i;
         missing = 0;
      } else {
         missing++;
      }
 
      // stop if ten consecutive files are not found
      if (missing > 10)
         break;
   }
 
   *num_messages = n;
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_msg_retrieve(INT n_message, char *message, INT buf_size) {
   int status;
   char *messages = NULL;
   int num_messages = 0;
 
   if (rpc_is_remote())
      return rpc_call(RPC_CM_MSG_RETRIEVE, n_message, message, buf_size);
 
   status = cm_msg_retrieve2("midas", 0, n_message, &messages, &num_messages);
 
   if (messages) {
      mstrlcpy(message, messages, buf_size);
      int len = strlen(messages);
      if (len > buf_size)
         status = CM_TRUNCATED;
      free(messages);
   }
 
   return status;
}
 
 
/********************************************************************/
INT cm_synchronize(DWORD *seconds) {
   INT sec, status;
 
   /* if connected to server, get time from there */
   if (rpc_is_remote()) {
      status = rpc_call(RPC_CM_SYNCHRONIZE, &sec);
 
      /* set local time */
      if (status == CM_SUCCESS)
         ss_settime(sec);
   }
 
   /* return time to caller */
   if (seconds != NULL) {
      *seconds = ss_time();
   }
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_asctime(char *str, INT buf_size) {
   /* if connected to server, get time from there */
   if (rpc_is_remote())
      return rpc_call(RPC_CM_ASCTIME, str, buf_size);
 
   /* return local time */
   mstrlcpy(str, ss_asctime().c_str(), buf_size);
 
   return CM_SUCCESS;
}
 
/********************************************************************/
std::string cm_asctime() {
   /* if connected to server, get time from there */
   if (rpc_is_remote()) {
      char buf[256];
      int status = rpc_call(RPC_CM_ASCTIME, buf, sizeof(buf));
      if (status == CM_SUCCESS) {
         return buf;
      } else {
         return "";
      }
   }
 
   /* return local time */
   return ss_asctime();
}
 
/********************************************************************/
INT cm_time(DWORD *t) {
   /* if connected to server, get time from there */
   if (rpc_is_remote())
      return rpc_call(RPC_CM_TIME, t);
 
   /* return local time */
   *t = ss_time();
 
   return CM_SUCCESS;
}
 
 
/********************************************************************\
*                                                                    *
*           cm_xxx  -  Common Functions to buffer & database         *
*                                                                    *
\********************************************************************/
 
/* Globals */
 
static HNDLE _hKeyClient = 0;   /* key handle for client in ODB */
static HNDLE _hDB = 0;          /* Database handle */
static std::string _experiment_name;
static std::string _client_name;
static std::string _path_name;
static INT _watchdog_timeout = DEFAULT_WATCHDOG_TIMEOUT;
INT _semaphore_alarm = -1;
INT _semaphore_elog = -1;
INT _semaphore_history = -1;
//INT _semaphore_msg = -1;
 
const char *cm_get_version() {
   return MIDAS_VERSION;
}
 
const char *cm_get_revision() {
   return GIT_REVISION;
}
 
/********************************************************************/
INT cm_set_path(const char *path) {
   assert(path);
   assert(path[0] != 0);
 
   _path_name = path;
 
   if (_path_name.back() != DIR_SEPARATOR) {
      _path_name += DIR_SEPARATOR_STR;
   }
 
   //printf("cm_set_path [%s]\n", _path_name.c_str());
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_get_path(char *path, int path_size) {
   // check that we were not accidentally called
   // with the size of the pointer to a string
   // instead of the size of the string buffer
   assert(path_size != sizeof(char *));
   assert(path);
   assert(_path_name.length() > 0);
 
   mstrlcpy(path, _path_name.c_str(), path_size);
 
   return CM_SUCCESS;
}
 
/********************************************************************/
std::string cm_get_path() {
   assert(_path_name.length() > 0);
   return _path_name;
}
 
/********************************************************************/
/* C++ wrapper for cm_get_path */
 
INT EXPRT cm_get_path_string(std::string *path) {
   assert(path != NULL);
   assert(_path_name.length() > 0);
   *path = _path_name;
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_set_experiment_name(const char *name) {
   _experiment_name = name;
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_get_experiment_name(char *name, int name_length) {
   mstrlcpy(name, _experiment_name.c_str(), name_length);
   return CM_SUCCESS;
}
 
/********************************************************************/
std::string cm_get_experiment_name() {
   return _experiment_name;
}
 
 
#ifdef LOCAL_ROUTINES
 
struct exptab_entry {
   std::string name;
   std::string directory;
   std::string user;
};
 
struct exptab_struct {
   std::string filename;
   std::vector<exptab_entry> exptab;
};
 
static exptab_struct _exptab; // contents of exptab file
 
INT cm_read_exptab(exptab_struct *exptab)
{
   exptab->exptab.clear();
 
   /* MIDAS_DIR overrides exptab */
   if (getenv("MIDAS_DIR")) {
      exptab->filename = "MIDAS_DIR";
 
      exptab_entry e;
 
      if (getenv("MIDAS_EXPT_NAME")) {
         e.name = getenv("MIDAS_EXPT_NAME");
      } else {
         e.name = "Default";
         cm_msg(MERROR, "cm_read_exptab", "Experiments that use MIDAS_DIR must also set MIDAS_EXPT_NAME to the name of the experiment! Using experiment name \"%s\"", e.name.c_str());
      }
 
      e.directory = getenv("MIDAS_DIR");
      e.user = "";
 
      exptab->exptab.push_back(e);
 
      return CM_SUCCESS;
   }
 
   /* default directory for different OSes */
#if defined (OS_WINNT)
   std::string str;
   if (getenv("SystemRoot"))
      str = getenv("SystemRoot");
   else if (getenv("windir"))
      str = getenv("windir");
   else
      str = "";
 
   std::string alt_str = str;
   str += "\\system32\\exptab";
   alt_str += "\\system\\exptab";
#elif defined (OS_UNIX)
   std::string str = "/etc/exptab";
   std::string alt_str = "/exptab";
#else
   std::strint str = "exptab";
   std::string alt_str = "exptab";
#endif
 
   /* MIDAS_EXPTAB overrides default directory */
   if (getenv("MIDAS_EXPTAB")) {
      str = getenv("MIDAS_EXPTAB");
      alt_str = getenv("MIDAS_EXPTAB");
   }
   
   exptab->filename = str;
 
   /* read list of available experiments */
   FILE* f = fopen(str.c_str(), "r");
   if (f == NULL) {
      f = fopen(alt_str.c_str(), "r");
      if (f == NULL)
         return CM_UNDEF_ENVIRON;
      exptab->filename = alt_str;
   }
 
   if (f != NULL) {
      do {
         char buf[256];
         memset(buf, 0, sizeof(buf));
         char* str = fgets(buf, sizeof(buf)-1, f);
         if (str == NULL)
            break;
         if (str[0] == 0) continue; // empty line
         if (str[0] == '#') continue; // comment line
 
         exptab_entry e;
 
         // following code emulates the function of this sprintf():
         //sscanf(str, "%s %s %s", exptab[i].name, exptab[i].directory, exptab[i].user);
 
         // skip leading spaces
         while (*str && isspace(*str))
            str++;
 
         char* p1 = str;
         char* p2 = str;
 
         while (*p2 && !isspace(*p2))
            p2++;
 
         ssize_t len = p2-p1;
 
         if (len<1)
            continue;
         
         //printf("str %d [%s] p1 [%s] p2 %d [%s] len %d\n", *str, str, p1, *p2, p2, (int)len);
 
         e.name = std::string(p1, len);
 
         if (*p2 == 0)
            continue;
 
         str = p2;
 
         // skip leading spaces
         while (*str && isspace(*str))
            str++;
         
         p1 = str;
         p2 = str;
 
         while (*p2 && !isspace(*p2))
            p2++;
 
         len = p2-p1;
 
         if (len<1)
            continue;
         
         //printf("str %d [%s] p1 [%s] p2 %d [%s] len %d\n", *str, str, p1, *p2, p2, (int)len);
 
         e.directory = std::string(p1, len);
 
         if (*p2 == 0)
            continue;
 
         str = p2;
 
         // skip leading spaces
         while (*str && isspace(*str))
            str++;
         
         p1 = str;
         p2 = str;
 
         while (*p2 && !isspace(*p2))
            p2++;
 
         len = p2-p1;
 
         //printf("str %d [%s] p1 [%s] p2 %d [%s] len %d\n", *str, str, p1, *p2, p2, (int)len);
 
         e.user = std::string(p1, len);
         
         /* check for trailing directory separator */
         if (!ends_with_char(e.directory, DIR_SEPARATOR)) {
            e.directory += DIR_SEPARATOR_STR;
         }
         
         exptab->exptab.push_back(e);
      } while (!feof(f));
      fclose(f);
   }
 
#if 0
   cm_msg(MINFO, "cm_read_exptab", "Read exptab \"%s\":", exptab->filename.c_str()); 
   for (unsigned j=0; j<exptab->exptab.size(); j++) {
      cm_msg(MINFO, "cm_read_exptab", "entry %d, experiment \"%s\", directory \"%s\", user \"%s\"", j, exptab->exptab[j].name.c_str(), exptab->exptab[j].directory.c_str(), exptab->exptab[j].user.c_str());
   }
#endif
 
   return CM_SUCCESS;
}
 
/********************************************************************/
int cm_get_exptab_filename(char *s, int size) {
   mstrlcpy(s, _exptab.filename.c_str(), size);
   return CM_SUCCESS;
}
 
std::string cm_get_exptab_filename() {
   return _exptab.filename;
}
 
/********************************************************************/
int cm_get_exptab(const char *expname, std::string* dir, std::string* user) {
 
   if (_exptab.exptab.size() == 0) {
      int status = cm_read_exptab(&_exptab);
      if (status != CM_SUCCESS)
         return status;
   }
 
   for (unsigned i = 0; i < _exptab.exptab.size(); i++) {
      if (_exptab.exptab[i].name == expname) {
         if (dir)
            *dir = _exptab.exptab[i].directory;
         if (user)
            *user = _exptab.exptab[i].user;
         return CM_SUCCESS;
      }
   }
   if (dir)
      *dir = "";
   if (user)
      *user = "";
   return CM_UNDEF_EXP;
}
 
/********************************************************************/
int cm_get_exptab(const char *expname, char *dir, int dir_size, char *user, int user_size) {
   std::string sdir, suser;
   int status = cm_get_exptab(expname, &sdir, &suser);
   if (status == CM_SUCCESS) {
      if (dir)
         mstrlcpy(dir, sdir.c_str(), dir_size);
      if (user)
         mstrlcpy(user, suser.c_str(), user_size);
      return CM_SUCCESS;
   }
   return CM_UNDEF_EXP;
}
 
#endif // LOCAL_ROUTINES
 
/********************************************************************/
INT cm_delete_client_info(HNDLE hDB, INT pid) {
   /* only do it if local */
   if (!rpc_is_remote()) {
      db_delete_client_info(hDB, pid);
   }
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_check_client(HNDLE hDB, HNDLE hKeyClient) {
   if (rpc_is_remote())
      return rpc_call(RPC_CM_CHECK_CLIENT, hDB, hKeyClient);
 
#ifdef LOCAL_ROUTINES
   return db_check_client(hDB, hKeyClient);
#endif                          /*LOCAL_ROUTINES */
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_set_client_info(HNDLE hDB, HNDLE *hKeyClient, const char *host_name,
                       char *client_name, INT hw_type, const char *password, DWORD watchdog_timeout) {
   if (rpc_is_remote())
      return rpc_call(RPC_CM_SET_CLIENT_INFO, hDB, hKeyClient,
                      host_name, client_name, hw_type, password, watchdog_timeout);
 
#ifdef LOCAL_ROUTINES
   {
      INT status, pid, data, i, idx, size;
      HNDLE hKey, hSubkey;
      char str[256], name[NAME_LENGTH], orig_name[NAME_LENGTH], pwd[NAME_LENGTH];
      BOOL call_watchdog, allow;
      PROGRAM_INFO_STR(program_info_str);
 
      /* check security if password is present */
      status = db_find_key(hDB, 0, "/Experiment/Security/Password", &hKey);
      if (hKey) {
         /* get password */
         size = sizeof(pwd);
         db_get_data(hDB, hKey, pwd, &size, TID_STRING);
 
         /* first check allowed hosts list */
         allow = FALSE;
         db_find_key(hDB, 0, "/Experiment/Security/Allowed hosts", &hKey);
         if (hKey && db_find_key(hDB, hKey, host_name, &hKey) == DB_SUCCESS)
            allow = TRUE;
 
         /* check allowed programs list */
         db_find_key(hDB, 0, "/Experiment/Security/Allowed programs", &hKey);
         if (hKey && db_find_key(hDB, hKey, client_name, &hKey) == DB_SUCCESS)
            allow = TRUE;
 
         /* now check password */
         if (!allow && strcmp(password, pwd) != 0) {
            if (password[0])
               cm_msg(MINFO, "cm_set_client_info", "Wrong password for host %s", host_name);
            return CM_WRONG_PASSWORD;
         }
      }
 
      /* make following operation atomic by locking database */
      db_lock_database(hDB);
 
      /* check if entry with this pid exists already */
      pid = ss_getpid();
 
      sprintf(str, "System/Clients/%0d", pid);
      status = db_find_key(hDB, 0, str, &hKey);
      if (status == DB_SUCCESS) {
         db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE | MODE_DELETE, TRUE);
         db_delete_key(hDB, hKey);
      }
 
      if (strlen(client_name) >= NAME_LENGTH)
         client_name[NAME_LENGTH] = 0;
 
      strcpy(name, client_name);
      strcpy(orig_name, client_name);
 
      /* check if client name already exists */
      status = db_find_key(hDB, 0, "System/Clients", &hKey);
 
      for (idx = 1; status != DB_NO_MORE_SUBKEYS; idx++) {
         for (i = 0;; i++) {
            status = db_enum_key(hDB, hKey, i, &hSubkey);
            if (status == DB_NO_MORE_SUBKEYS)
               break;
 
            if (status == DB_SUCCESS) {
               size = sizeof(str);
               status = db_get_value(hDB, hSubkey, "Name", str, &size, TID_STRING, FALSE);
               if (status != DB_SUCCESS)
                  continue;
            }
 
            /* check if client is living */
            if (cm_check_client(hDB, hSubkey) == CM_NO_CLIENT)
               continue;
 
            if (equal_ustring(str, name)) {
               sprintf(name, "%s%d", client_name, idx);
               break;
            }
         }
      }
 
      /* set name */
      sprintf(str, "System/Clients/%0d/Name", pid);
      status = db_set_value(hDB, 0, str, name, NAME_LENGTH, 1, TID_STRING);
      if (status != DB_SUCCESS) {
         db_unlock_database(hDB);
         cm_msg(MERROR, "cm_set_client_info", "cannot set client name, db_set_value(%s) status %d", str, status);
         return status;
      }
 
      /* copy new client name */
      strcpy(client_name, name);
      db_set_client_name(hDB, client_name);
 
      /* set also as rpc name */
      rpc_set_name(client_name);
 
      /* use /system/clients/PID as root */
      sprintf(str, "System/Clients/%0d", pid);
      db_find_key(hDB, 0, str, &hKey);
 
      /* set host name */
      status = db_set_value(hDB, hKey, "Host", host_name, HOST_NAME_LENGTH, 1, TID_STRING);
      if (status != DB_SUCCESS) {
         db_unlock_database(hDB);
         return status;
      }
 
      /* set computer id */
      status = db_set_value(hDB, hKey, "Hardware type", &hw_type, sizeof(hw_type), 1, TID_INT32);
      if (status != DB_SUCCESS) {
         db_unlock_database(hDB);
         return status;
      }
 
      /* set server port */
      data = 0;
      status = db_set_value(hDB, hKey, "Server Port", &data, sizeof(INT), 1, TID_INT32);
      if (status != DB_SUCCESS) {
         db_unlock_database(hDB);
         return status;
      }
 
      /* lock client entry */
      db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
      /* get (set) default watchdog timeout */
      size = sizeof(watchdog_timeout);
      sprintf(str, "/Programs/%s/Watchdog Timeout", orig_name);
      db_get_value(hDB, 0, str, &watchdog_timeout, &size, TID_INT32, TRUE);
 
      /* define /programs entry */
      sprintf(str, "/Programs/%s", orig_name);
      db_create_record(hDB, 0, str, strcomb1(program_info_str).c_str());
 
      /* save handle for ODB and client */
      cm_set_experiment_database(hDB, hKey);
 
      /* save watchdog timeout */
      cm_get_watchdog_params(&call_watchdog, NULL);
      cm_set_watchdog_params(call_watchdog, watchdog_timeout);
 
      /* end of atomic operations */
      db_unlock_database(hDB);
 
      /* touch notify key to inform others */
      data = 0;
      db_set_value(hDB, 0, "/System/Client Notify", &data, sizeof(data), 1, TID_INT32);
 
      *hKeyClient = hKey;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return CM_SUCCESS;
}
 
/********************************************************************/
std::string cm_get_client_name()
{
   INT status;
   HNDLE hDB, hKey;
 
   /* get root key of client */
   cm_get_experiment_database(&hDB, &hKey);
   if (!hDB) {
      return "unknown";
   }
 
   std::string name;
 
   status = db_get_value_string(hDB, hKey, "Name", 0, &name);
   if (status != DB_SUCCESS) {
      return "unknown";
   }
 
   //printf("get client name: [%s]\n", name.c_str());
 
   return name;
}
 
/********************************************************************/
INT cm_get_environment(char *host_name, int host_name_size, char *exp_name, int exp_name_size) {
   if (host_name)
      host_name[0] = 0;
   if (exp_name)
      exp_name[0] = 0;
 
   if (host_name && getenv("MIDAS_SERVER_HOST"))
      mstrlcpy(host_name, getenv("MIDAS_SERVER_HOST"), host_name_size);
 
   if (exp_name && getenv("MIDAS_EXPT_NAME"))
      mstrlcpy(exp_name, getenv("MIDAS_EXPT_NAME"), exp_name_size);
 
   return CM_SUCCESS;
}
 
INT cm_get_environment(std::string *host_name, std::string *exp_name) {
   if (host_name)
      *host_name = "";
   if (exp_name)
      *exp_name = "";
 
   if (host_name && getenv("MIDAS_SERVER_HOST"))
      *host_name = getenv("MIDAS_SERVER_HOST");
 
   if (exp_name && getenv("MIDAS_EXPT_NAME"))
      *exp_name = getenv("MIDAS_EXPT_NAME");
 
   return CM_SUCCESS;
}
 
#ifdef LOCAL_ROUTINES
 
int cm_set_experiment_local(const char* exp_name)
{
   std::string exp_name1;
 
   if ((exp_name != NULL) && (strlen(exp_name) > 0)) {
      exp_name1 = exp_name;
   } else {
      int status = cm_select_experiment_local(&exp_name1);
      if (status != CM_SUCCESS)
         return status;
   }
 
   std::string expdir, expuser;
   
   int status = cm_get_exptab(exp_name1.c_str(), &expdir, &expuser);
   
   if (status != CM_SUCCESS) {
      cm_msg(MERROR, "cm_set_experiment_local", "Experiment \"%s\" not found in exptab file \"%s\"", exp_name1.c_str(), cm_get_exptab_filename().c_str());
      return CM_UNDEF_EXP;
   }
 
   if (!ss_dir_exist(expdir.c_str())) {
      cm_msg(MERROR, "cm_set_experiment_local", "Experiment \"%s\" directory \"%s\" does not exist", exp_name1.c_str(), expdir.c_str());
      return CM_UNDEF_EXP;
   }
   
   cm_set_experiment_name(exp_name1.c_str());
   cm_set_path(expdir.c_str());
 
   return CM_SUCCESS;
}
 
#endif // LOCAL_ROUTINES
   
/********************************************************************/
void cm_check_connect(void) {
   if (_hKeyClient) {
      cm_msg(MERROR, "cm_check_connect", "cm_disconnect_experiment not called at end of program");
      cm_msg_flush_buffer();
   }
}
 
/********************************************************************/
INT cm_connect_experiment(const char *host_name, const char *exp_name, const char *client_name, void (*func)(char *)) {
   INT status;
 
   status = cm_connect_experiment1(host_name, exp_name, client_name, func, DEFAULT_ODB_SIZE, DEFAULT_WATCHDOG_TIMEOUT);
   cm_msg_flush_buffer();
   if (status != CM_SUCCESS) {
      std::string s = cm_get_error(status);
      puts(s.c_str());
   }
 
   return status;
}
 
/********************************************************************/
INT cm_connect_experiment1(const char *host_name, const char *default_exp_name,
                           const char *client_name, void (*func)(char *), INT odb_size, DWORD watchdog_timeout) {
   INT status, size;
   char client_name1[NAME_LENGTH];
   char password[NAME_LENGTH], str[256];
   HNDLE hDB = 0, hKeyClient = 0;
   BOOL call_watchdog;
 
   ss_tzset(); // required for localtime_r()
 
   if (_hKeyClient)
      cm_disconnect_experiment();
 
   cm_msg_early_init();
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg before connecting to experiment");
   //cm_msg_flush_buffer();
 
   rpc_set_name(client_name);
 
   /* check for local host */
   if (equal_ustring(host_name, "local"))
      host_name = NULL;
 
#ifdef OS_WINNT
   {
      WSADATA WSAData;
 
      /* Start windows sockets */
      if (WSAStartup(MAKEWORD(1, 1), &WSAData) != 0)
         return RPC_NET_ERROR;
   }
#endif
 
   std::string default_exp_name1;
   if (default_exp_name)
      default_exp_name1 = default_exp_name;
 
   /* connect to MIDAS server */
   if (host_name && host_name[0]) {
      if (default_exp_name1.length() == 0) {
         status = cm_select_experiment_remote(host_name, &default_exp_name1);
         if (status != CM_SUCCESS)
            return status;
      }
 
      cm_set_experiment_name(default_exp_name1.c_str());
 
      status = rpc_server_connect(host_name, default_exp_name1.c_str());
      if (status != RPC_SUCCESS)
         return status;
 
      /* register MIDAS library functions */
      status = rpc_register_functions(rpc_get_internal_list(1), NULL);
      if (status != RPC_SUCCESS)
         return status;
   } else {
      /* lookup path for *SHM files and save it */
 
#ifdef LOCAL_ROUTINES
      status = cm_set_experiment_local(default_exp_name1.c_str());
      if (status != CM_SUCCESS)
         return status;
 
      default_exp_name1 = cm_get_experiment_name();
 
      ss_suspend_init_odb_port();
 
      INT semaphore_elog, semaphore_alarm, semaphore_history, semaphore_msg;
 
      /* create alarm and elog semaphores */
      status = ss_semaphore_create("ALARM", &semaphore_alarm);
      if (status != SS_CREATED && status != SS_SUCCESS) {
         cm_msg(MERROR, "cm_connect_experiment", "Cannot create alarm semaphore");
         return status;
      }
      status = ss_semaphore_create("ELOG", &semaphore_elog);
      if (status != SS_CREATED && status != SS_SUCCESS) {
         cm_msg(MERROR, "cm_connect_experiment", "Cannot create elog semaphore");
         return status;
      }
      status = ss_semaphore_create("HISTORY", &semaphore_history);
      if (status != SS_CREATED && status != SS_SUCCESS) {
         cm_msg(MERROR, "cm_connect_experiment", "Cannot create history semaphore");
         return status;
      }
      status = ss_semaphore_create("MSG", &semaphore_msg);
      if (status != SS_CREATED && status != SS_SUCCESS) {
         cm_msg(MERROR, "cm_connect_experiment", "Cannot create message semaphore");
         return status;
      }
 
      cm_set_experiment_semaphore(semaphore_alarm, semaphore_elog, semaphore_history, semaphore_msg);
#else
      return CM_UNDEF_EXP;
#endif
   }
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg before open ODB");
   //cm_msg_flush_buffer();
 
   /* open ODB */
   if (odb_size == 0)
      odb_size = DEFAULT_ODB_SIZE;
 
   status = db_open_database("ODB", odb_size, &hDB, client_name);
   if (status != DB_SUCCESS && status != DB_CREATED) {
      cm_msg(MERROR, "cm_connect_experiment1", "cannot open database, db_open_database() status %d", status);
      return status;
   }
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg after open ODB");
   //cm_msg_flush_buffer();
 
   int odb_timeout = db_set_lock_timeout(hDB, 0);
   size = sizeof(odb_timeout);
   status = db_get_value(hDB, 0, "/Experiment/ODB timeout", &odb_timeout, &size, TID_INT32, TRUE);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment1", "cannot get ODB /Experiment/ODB timeout, status %d", status);
   }
 
   if (odb_timeout > 0) {
      db_set_lock_timeout(hDB, odb_timeout);
   }
 
   BOOL protect_odb = FALSE;
   size = sizeof(protect_odb);
   status = db_get_value(hDB, 0, "/Experiment/Protect ODB", &protect_odb, &size, TID_BOOL, TRUE);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment1", "cannot get ODB /Experiment/Protect ODB, status %d", status);
   }
 
   if (protect_odb) {
      db_protect_database(hDB);
   }
 
   BOOL enable_core_dumps = FALSE;
   size = sizeof(enable_core_dumps);
   status = db_get_value(hDB, 0, "/Experiment/Enable core dumps", &enable_core_dumps, &size, TID_BOOL, TRUE);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment1", "cannot get ODB /Experiment/Enable core dumps, status %d", status);
   }
 
   if (enable_core_dumps) {
#ifdef RLIMIT_CORE
      struct rlimit limit;
      limit.rlim_cur = RLIM_INFINITY;
      limit.rlim_max = RLIM_INFINITY;
      status = setrlimit(RLIMIT_CORE, &limit);
      if (status != 0) {
         cm_msg(MERROR, "cm_connect_experiment", "Cannot setrlimit(RLIMIT_CORE, RLIM_INFINITY), errno %d (%s)", errno,
                strerror(errno));
      }
#else
#warning setrlimit(RLIMIT_CORE) is not available
#endif
   }
 
   size = sizeof(disable_bind_rpc_to_localhost);
   status = db_get_value(hDB, 0, "/Experiment/Security/Enable non-localhost RPC", &disable_bind_rpc_to_localhost, &size,
                         TID_BOOL, TRUE);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment1",
             "cannot get ODB /Experiment/Security/Enable non-localhost RPC, status %d", status);
   }
 
   std::string local_host_name;
   
   /* now setup client info */
   if (!disable_bind_rpc_to_localhost)
      local_host_name = "localhost";
   else
      local_host_name = ss_gethostname();
 
   /* check watchdog timeout */
   if (watchdog_timeout == 0)
      watchdog_timeout = DEFAULT_WATCHDOG_TIMEOUT;
 
   strcpy(client_name1, client_name);
   password[0] = 0;
   status = cm_set_client_info(hDB, &hKeyClient, local_host_name.c_str(), client_name1, rpc_get_hw_type(), password, watchdog_timeout);
 
   if (status == CM_WRONG_PASSWORD) {
      if (func == NULL)
         strcpy(str, ss_getpass("Password: "));
      else
         func(str);
 
      strcpy(password, ss_crypt(str, "mi"));
      status = cm_set_client_info(hDB, &hKeyClient, local_host_name.c_str(), client_name1, rpc_get_hw_type(), password, watchdog_timeout);
      if (status != CM_SUCCESS) {
         /* disconnect */
         if (rpc_is_remote())
            rpc_server_disconnect();
         cm_disconnect_experiment();
 
         return status;
      }
   }
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg after set client info");
   //cm_msg_flush_buffer();
 
   /* tell the rest of MIDAS that ODB is open for business */
 
   cm_set_experiment_database(hDB, hKeyClient);
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg after set experiment database");
   //cm_msg_flush_buffer();
 
   /* cm_msg_open_buffer() calls bm_open_buffer() calls ODB function
    * to get event buffer size, etc */
 
   status = cm_msg_open_buffer();
   if (status != CM_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment1", "cannot open message buffer, cm_msg_open_buffer() status %d", status);
      return status;
   }
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg after message system is ready");
   //cm_msg_flush_buffer();
 
   /* set experiment name in ODB if not present */
   std::string current_name;
   db_get_value_string(hDB, 0, "/Experiment/Name", 0, &current_name, TRUE);
   if (current_name.length() == 0 || current_name == "Default") {
      db_set_value_string(hDB, 0, "/Experiment/Name", &default_exp_name1);
   }
 
   if (!rpc_is_remote()) {
      /* experiment path is only set for local connections */
      /* set data dir in ODB */
      std::string path = cm_get_path();
      db_get_value_string(hDB, 0, "/Logger/Data dir", 0, &path, TRUE);
   }
 
   /* register server to be able to be called by other clients */
   status = cm_register_server();
   if (status != CM_SUCCESS) {
      cm_msg(MERROR, "cm_connect_experiment", "Cannot register RPC server, cm_register_server() status %d", status);
      if (!equal_ustring(client_name, "odbedit")) {
         return status;
      }
   }
 
   /* set watchdog timeout */
   cm_get_watchdog_params(&call_watchdog, &watchdog_timeout);
   size = sizeof(watchdog_timeout);
   sprintf(str, "/Programs/%s/Watchdog Timeout", client_name);
   db_get_value(hDB, 0, str, &watchdog_timeout, &size, TID_INT32, TRUE);
   cm_set_watchdog_params(call_watchdog, watchdog_timeout);
 
   /* set command line */
   std::string cmdline = ss_get_cmdline();
   std::string path = "/Programs/" + std::string(client_name);
   midas::odb prog(path);
   if (!midas::odb::exists(path + "/Start command") ||
       prog["Start command"] == std::string(""))
      prog["Start command"].set_string_size(cmdline, 256);
 
   /* get final client name */
   std::string xclient_name = rpc_get_name();
 
   /* startup message is not displayed */
   cm_msg(MLOG, "cm_connect_experiment", "Program %s on host %s started", xclient_name.c_str(), local_host_name.c_str());
 
   /* enable system and user messages to stdout as default */
   cm_set_msg_print(MT_ALL, MT_ALL, puts);
 
   /* call cm_check_connect when exiting */
   atexit((void (*)(void)) cm_check_connect);
 
   /* register ctrl-c handler */
   ss_ctrlc_handler(cm_ctrlc_handler);
 
   //cm_msg(MERROR, "cm_connect_experiment", "test cm_msg after connect to experiment is complete");
   //cm_msg_flush_buffer();
 
   return CM_SUCCESS;
}
 
#ifdef LOCAL_ROUTINES
/********************************************************************/
INT cm_list_experiments_local(STRING_LIST *exp_names) {
   assert(exp_names != NULL);
   exp_names->clear();
 
   if (_exptab.exptab.size() == 0) {
      int status = cm_read_exptab(&_exptab);
      if (status != CM_SUCCESS)
         return status;
   }
   
   for (unsigned i=0; i<_exptab.exptab.size(); i++) {
      exp_names->push_back(_exptab.exptab[i].name);
   }
   
   return CM_SUCCESS;
}
#endif // LOCAL_ROUTINES
 
/********************************************************************/
INT cm_list_experiments_remote(const char *host_name, STRING_LIST *exp_names) {
   INT status;
   INT sock;
   int port = MIDAS_TCP_PORT;
   char hname[256];
   char *s;
 
   assert(exp_names != NULL);
   exp_names->clear();
 
   /* extract port number from host_name */
   mstrlcpy(hname, host_name, sizeof(hname));
   s = strchr(hname, ':');
   if (s) {
      *s = 0;
      port = strtoul(s + 1, NULL, 0);
   }
 
   std::string errmsg;
 
   status = ss_socket_connect_tcp(hname, port, &sock, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "cm_list_experiments_remote", "Cannot connect to \"%s\" port %d: %s", hname, port, errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   /* request experiment list */
   send(sock, "I", 2, 0);
 
   while (1) {
      char str[256];
 
      status = recv_string(sock, str, sizeof(str), _rpc_connect_timeout);
 
      if (status < 0)
         return RPC_NET_ERROR;
 
      if (status == 0)
         break;
 
      exp_names->push_back(str);
   }
 
   ss_socket_close(&sock);
 
   return CM_SUCCESS;
}
 
#ifdef LOCAL_ROUTINES
/********************************************************************/
INT cm_select_experiment_local(std::string *exp_name) {
   INT status;
   STRING_LIST expts;
 
   assert(exp_name != NULL);
 
   /* retrieve list of experiments and make selection */
   status = cm_list_experiments_local(&expts);
   if (status != CM_SUCCESS)
      return status;
 
   if (expts.size() == 1) {
      *exp_name = expts[0];
   } else if (expts.size() > 1) {
      printf("Available experiments on local computer:\n");
 
      for (unsigned i = 0; i < expts.size(); i++) {
         printf("%d : %s\n", i, expts[i].c_str());
      }
 
      while (1) {
         printf("Select number from 0 to %d: ", ((int)expts.size())-1);
         char str[32];
         ss_gets(str, 32);
         int isel = atoi(str);
         if (isel < 0)
            continue;
         if (isel >= (int)expts.size())
            continue;
         *exp_name = expts[isel];
         break;
      }
   } else {
      return CM_UNDEF_EXP;
   }
 
   return CM_SUCCESS;
}
#endif // LOCAL_ROUTINES
 
/********************************************************************/
INT cm_select_experiment_remote(const char *host_name, std::string *exp_name) {
   INT status;
   STRING_LIST expts;
 
   assert(exp_name != NULL);
 
   /* retrieve list of experiments and make selection */
   status = cm_list_experiments_remote(host_name, &expts);
   if (status != CM_SUCCESS)
      return status;
 
   if (expts.size() > 1) {
      printf("Available experiments on server %s:\n", host_name);
 
      for (unsigned i = 0; i < expts.size(); i++) {
         printf("%d : %s\n", i, expts[i].c_str());
      }
 
      while (1) {
         printf("Select number from 0 to %d: ", ((int)expts.size())-1);
         char str[32];
         ss_gets(str, 32);
         int isel = atoi(str);
         if (isel < 0)
            continue;
         if (isel >= (int)expts.size())
            continue;
         *exp_name = expts[isel];
         break;
      }
   } else {
      *exp_name = expts[0];
   }
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_connect_client(const char *client_name, HNDLE *hConn) {
   HNDLE hDB, hKeyRoot, hSubkey, hKey;
   INT status, i, length, port;
   char name[NAME_LENGTH], host_name[HOST_NAME_LENGTH];
 
   /* find client entry in ODB */
   cm_get_experiment_database(&hDB, &hKey);
 
   status = db_find_key(hDB, 0, "System/Clients", &hKeyRoot);
   if (status != DB_SUCCESS)
      return status;
 
   i = 0;
   do {
      /* search for client with specific name */
      status = db_enum_key(hDB, hKeyRoot, i++, &hSubkey);
      if (status == DB_NO_MORE_SUBKEYS)
         return CM_NO_CLIENT;
 
      status = db_find_key(hDB, hSubkey, "Name", &hKey);
      if (status != DB_SUCCESS)
         return status;
 
      length = NAME_LENGTH;
      status = db_get_data(hDB, hKey, name, &length, TID_STRING);
      if (status != DB_SUCCESS)
         return status;
 
      if (equal_ustring(name, client_name)) {
         status = db_find_key(hDB, hSubkey, "Server Port", &hKey);
         if (status != DB_SUCCESS)
            return status;
 
         length = sizeof(INT);
         status = db_get_data(hDB, hKey, &port, &length, TID_INT32);
         if (status != DB_SUCCESS)
            return status;
 
         status = db_find_key(hDB, hSubkey, "Host", &hKey);
         if (status != DB_SUCCESS)
            return status;
 
         length = sizeof(host_name);
         status = db_get_data(hDB, hKey, host_name, &length, TID_STRING);
         if (status != DB_SUCCESS)
            return status;
 
         /* client found -> connect to its server port */
         return rpc_client_connect(host_name, port, client_name, hConn);
      }
 
 
   } while (TRUE);
}
 
static void rpc_client_shutdown();
 
/********************************************************************/
INT cm_disconnect_client(HNDLE hConn, BOOL bShutdown) {
   return rpc_client_disconnect(hConn, bShutdown);
}
 
/********************************************************************/
INT cm_disconnect_experiment(void) {
   HNDLE hDB, hKey;
 
   //cm_msg(MERROR, "cm_disconnect_experiment", "test cm_msg before disconnect from experiment");
   //cm_msg_flush_buffer();
 
   /* wait on any transition thread */
   if (_trp.transition && !_trp.finished) {
      printf("Waiting for transition to finish...\n");
      do {
         ss_sleep(10);
      } while (!_trp.finished);
   }
 
   /* stop the watchdog thread */
   cm_stop_watchdog_thread();
 
   /* send shutdown notification */
   std::string client_name = rpc_get_name();
 
   std::string local_host_name;
   
   if (!disable_bind_rpc_to_localhost)
      local_host_name = "localhost";
   else {
      local_host_name = ss_gethostname();
      //if (strchr(local_host_name, '.'))
      //   *strchr(local_host_name, '.') = 0;
   }
 
   /* disconnect message not displayed */
   cm_msg(MLOG, "cm_disconnect_experiment", "Program %s on host %s stopped", client_name.c_str(), local_host_name.c_str());
   cm_msg_flush_buffer();
 
   if (rpc_is_remote()) {
      if (rpc_is_connected()) {
         /* close open records */
         db_close_all_records();
 
         cm_msg_close_buffer();
      }
 
      rpc_client_shutdown();
      rpc_server_disconnect();
 
      cm_set_experiment_database(0, 0);
   } else {
      rpc_client_shutdown();
 
      /* delete client info */
      cm_get_experiment_database(&hDB, &hKey);
 
      if (hDB)
         cm_delete_client_info(hDB, 0);
 
      //cm_msg(MERROR, "cm_disconnect_experiment", "test cm_msg before close all buffers, close all databases");
      //cm_msg_flush_buffer();
 
      cm_msg_close_buffer();
      bm_close_all_buffers();
      db_close_all_databases();
 
      cm_set_experiment_database(0, 0);
 
      //cm_msg(MERROR, "cm_disconnect_experiment", "test cm_msg after close all buffers, close all databases");
      //cm_msg_flush_buffer();
   }
 
   if (!rpc_is_mserver())
      rpc_server_shutdown();
 
   /* free RPC list */
   rpc_deregister_functions();
 
   //cm_msg(MERROR, "cm_disconnect_experiment", "test cm_msg before deleting the message ring buffer");
   //cm_msg_flush_buffer();
 
   /* last flush before we delete the message ring buffer */
   cm_msg_flush_buffer();
 
   //cm_msg(MERROR, "cm_disconnect_experiment", "test cm_msg after disconnect is completed");
   //cm_msg_flush_buffer();
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_set_experiment_database(HNDLE hDB, HNDLE hKeyClient) {
   //printf("cm_set_experiment_database: hDB %d, hKeyClient %d\n", hDB, hKeyClient);
 
   _hDB = hDB;
   _hKeyClient = hKeyClient;
 
   //if (hDB == 0) {
   //   rpc_set_server_option(RPC_ODB_HANDLE, 0);
   //}
 
   return CM_SUCCESS;
}
 
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT cm_set_experiment_semaphore(INT semaphore_alarm, INT semaphore_elog, INT semaphore_history, INT semaphore_msg)
/********************************************************************\
 
  Routine: cm_set_experiment_semaphore
 
  Purpose: Set the handle to the experiment wide semaphorees
 
  Input:
    INT    semaphore_alarm      Alarm semaphore
    INT    semaphore_elog       Elog semaphore
    INT    semaphore_history    History semaphore
    INT    semaphore_msg        Message semaphore
 
  Output:
    none
 
  Function value:
    CM_SUCCESS              Successful completion
 
\********************************************************************/
{
   _semaphore_alarm = semaphore_alarm;
   _semaphore_elog = semaphore_elog;
   _semaphore_history = semaphore_history;
   //_semaphore_msg = semaphore_msg;
 
   return CM_SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT cm_get_experiment_database(HNDLE *hDB, HNDLE *hKeyClient) {
   if (_hDB) {
      //printf("cm_get_experiment_database %d %d\n", _hDB, _hKeyClient);
      if (hDB != NULL)
         *hDB = _hDB;
      if (hKeyClient != NULL)
         *hKeyClient = _hKeyClient;
      return CM_SUCCESS;
   } else {
      //printf("cm_get_experiment_database no init\n");
      if (hDB != NULL)
         *hDB = 0;
      if (hKeyClient != NULL)
         *hKeyClient = 0;
      return CM_DB_ERROR;
   }
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT cm_get_experiment_semaphore(INT *semaphore_alarm, INT *semaphore_elog, INT *semaphore_history, INT *semaphore_msg)
/********************************************************************\
 
  Routine: cm_get_experiment_semaphore
 
  Purpose: Get the handle to the experiment wide semaphores
 
  Input:
    none
 
  Output:
    INT    semaphore_alarm      Alarm semaphore
    INT    semaphore_elog       Elog semaphore
    INT    semaphore_history    History semaphore
    INT    semaphore_msg        Message semaphore
 
  Function value:
    CM_SUCCESS              Successful completion
 
\********************************************************************/
{
   if (semaphore_alarm)
      *semaphore_alarm = _semaphore_alarm;
   if (semaphore_elog)
      *semaphore_elog = _semaphore_elog;
   if (semaphore_history)
      *semaphore_history = _semaphore_history;
   //if (semaphore_msg)
   //   *semaphore_msg = _semaphore_msg;
   if (semaphore_msg)
      *semaphore_msg = -1;
 
   return CM_SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
#ifdef LOCAL_ROUTINES
static BUFFER* bm_get_buffer(const char *who, INT buffer_handle, int *pstatus);
static int bm_lock_buffer_read_cache(BUFFER *pbuf);
static int bm_lock_buffer_write_cache(BUFFER *pbuf);
static int bm_lock_buffer_mutex(BUFFER *pbuf);
static int xbm_lock_buffer(BUFFER *pbuf);
static void xbm_unlock_buffer(BUFFER *pbuf);
 
class bm_lock_buffer_guard
{
public:
   bool fDebug = false;
   
public:
   bm_lock_buffer_guard(BUFFER* pbuf, bool do_not_lock=false) // ctor
   {
      assert(pbuf != NULL);
      fBuf = pbuf;
      if (do_not_lock) {
         if (fDebug)
            printf("lock_buffer_guard(%s) ctor without lock\n", fBuf->buffer_name);
         return;
      }
      if (fDebug)
         printf("lock_buffer_guard(%s) ctor\n", fBuf->buffer_name);
      int status = xbm_lock_buffer(fBuf);
      if (status != BM_SUCCESS) {
         fLocked = false;
         fError  = true;
         fStatus = status;
      } else {
         fLocked = true;
      }
   }
 
   ~bm_lock_buffer_guard() // dtor
   {
      if (fInvalid) {
         if (fDebug)
            printf("lock_buffer_guard(invalid) dtor\n");
      } else {
         assert(fBuf != NULL);
         if (fDebug)
            printf("lock_buffer_guard(%s) dtor, locked %d, error %d\n", fBuf->buffer_name, fLocked, fError);
         if (fLocked) {
            xbm_unlock_buffer(fBuf);
            fLocked = false;
            fError = false;
         }
         fBuf = NULL;
      }
   }
 
   // make object uncopyable
   bm_lock_buffer_guard(const bm_lock_buffer_guard&) = delete;
   bm_lock_buffer_guard& operator=(const bm_lock_buffer_guard&) = delete;
 
   void unlock()
   {
      assert(fBuf != NULL);
      if (fDebug)
         printf("lock_buffer_guard(%s) unlock, locked %d, error %d\n", fBuf->buffer_name, fLocked, fError);
      assert(fLocked);
      xbm_unlock_buffer(fBuf);
      fLocked = false;
      fError = false;
   }
 
   bool relock()
   {
      assert(fBuf != NULL);
      if (fDebug)
         printf("lock_buffer_guard(%s) relock, locked %d, error %d\n", fBuf->buffer_name, fLocked, fError);
      assert(!fLocked);
      int status = xbm_lock_buffer(fBuf);
      if (status != BM_SUCCESS) {
         fLocked = false;
         fError  = true;
         fStatus = status;
      } else {
         fLocked = true;
      }
      return fLocked;
   }
 
   void invalidate()
   {
      assert(fBuf != NULL);
      if (fDebug)
         printf("lock_buffer_guard(%s) invalidate, locked %d, error %d\n", fBuf->buffer_name, fLocked, fError);
      assert(!fLocked);
      fInvalid = true;
      fBuf = NULL;
   }
 
   bool is_locked() const
   {
      return fLocked;
   }
 
   bool is_error() const
   {
      return fError;
   }
 
   int get_status() const
   {
      return fStatus;
   }
 
   BUFFER* get_pbuf() const
   {
      assert(!fInvalid); // pbuf was deleted
      assert(fBuf); // we do not return NULL
      return fBuf;
   }
   
private:
   BUFFER* fBuf    = NULL;
   bool    fLocked = false;
   bool    fError  = false;
   bool    fInvalid = false;
   int     fStatus = 0;
};
 
static BUFFER_CLIENT *bm_get_my_client_locked(bm_lock_buffer_guard& pbuf_guard);
 
#endif
 
static INT bm_notify_client(const char *buffer_name, int s);
 
static INT bm_push_event(const char *buffer_name);
 
static void bm_defragment_event(HNDLE buffer_handle, HNDLE request_id,
                                EVENT_HEADER *pevent, void *pdata,
                                EVENT_HANDLER *dispatcher);
 
/********************************************************************/
INT cm_set_watchdog_params_local(BOOL call_watchdog, DWORD timeout)
{
#ifdef LOCAL_ROUTINES
   _watchdog_timeout = timeout;
 
   std::vector<BUFFER*> mybuffers;
 
   gBuffersMutex.lock();
   mybuffers = gBuffers;
   gBuffersMutex.unlock();
 
   /* set watchdog timeout of all open buffers */
   for (BUFFER* pbuf : mybuffers) {
      
      if (!pbuf || !pbuf->attached)
         continue;
 
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked())
         continue;
      
      BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
      
      /* clear entry from client structure in buffer header */
      pclient->watchdog_timeout = timeout;
      
      /* show activity */
      pclient->last_activity = ss_millitime();
   }
 
   /* set watchdog timeout for ODB */
   db_set_watchdog_params(timeout);
 
#endif /* LOCAL_ROUTINES */
 
   return CM_SUCCESS;
}
 
INT cm_set_watchdog_params(BOOL call_watchdog, DWORD timeout)
{
   /* set also local timeout to requested value (needed by cm_enable_watchdog()) */
   _watchdog_timeout = timeout;
 
   if (rpc_is_remote()) { // we are connected remotely
 
      return rpc_call(RPC_CM_SET_WATCHDOG_PARAMS, call_watchdog, timeout);
 
   } else if (rpc_is_mserver()) { // we are the mserver
 
      RPC_SERVER_ACCEPTION* sa = rpc_get_mserver_acception();
      if (sa)
         sa->watchdog_timeout = timeout;
      
      /* write timeout value to client entry in ODB */
      HNDLE hDB, hKey;
      cm_get_experiment_database(&hDB, &hKey);
      
      if (hDB) {
         db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
         db_set_value(hDB, hKey, "Link timeout", &timeout, sizeof(timeout), 1, TID_INT32);
         db_set_mode(hDB, hKey, MODE_READ, TRUE);
      }
 
      /* set the watchdog for the local mserver program */
      return cm_set_watchdog_params_local(call_watchdog, timeout);
 
   } else { // only running locally
 
      return cm_set_watchdog_params_local(call_watchdog, timeout);
 
   }
}
 
/********************************************************************/
INT cm_get_watchdog_params(BOOL *call_watchdog, DWORD *timeout) {
   if (call_watchdog)
      *call_watchdog = FALSE;
   if (timeout)
      *timeout = _watchdog_timeout;
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_get_watchdog_info(HNDLE hDB, const char *client_name, DWORD *timeout, DWORD *last) {
   if (rpc_is_remote())
      return rpc_call(RPC_CM_GET_WATCHDOG_INFO, hDB, client_name, timeout, last);
 
#ifdef LOCAL_ROUTINES
   return db_get_watchdog_info(hDB, client_name, timeout, last);
#else                           /* LOCAL_ROUTINES */
   return CM_SUCCESS;
#endif                          /* LOCAL_ROUTINES */
}
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
 
static void load_rpc_hosts(HNDLE hDB, HNDLE hKey, int index, void *info) {
   int status;
   int i, last;
   KEY key;
   int max_size;
   char *str;
 
//   if (index != -99)
//      cm_msg(MINFO, "load_rpc_hosts", "Reloading RPC hosts access control list via hotlink callback");
 
   status = db_get_key(hDB, hKey, &key);
 
   if (status != DB_SUCCESS)
      return;
 
   //printf("clear rpc hosts!\n");
   rpc_clear_allowed_hosts();
 
   max_size = key.item_size;
   str = (char *) malloc(max_size);
 
   last = 0;
   for (i = 0; i < key.num_values; i++) {
      int size = max_size;
      status = db_get_data_index(hDB, hKey, str, &size, i, TID_STRING);
      if (status != DB_SUCCESS)
         break;
 
      if (strlen(str) < 1) // skip emties
         continue;
 
      if (str[0] == '#') // skip commented-out entries
         continue;
 
      //printf("add rpc hosts %d [%s]\n", i, str);
      rpc_add_allowed_host(str);
      last = i;
   }
 
   if (key.num_values - last < 10) {
      int new_size = last + 10;
      status = db_set_num_values(hDB, hKey, new_size);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "load_rpc_hosts",
                "Cannot resize the RPC hosts access control list, db_set_num_values(%d) status %d", new_size, status);
      }
   }
 
   free(str);
}
 
static void init_rpc_hosts(HNDLE hDB) {
   int status;
   char buf[256];
   int size, i;
   HNDLE hKey;
 
   strcpy(buf, "localhost");
   size = sizeof(buf);
 
   status = db_get_value(hDB, 0, "/Experiment/Security/RPC hosts/Allowed hosts[0]", buf, &size, TID_STRING, TRUE);
 
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "init_rpc_hosts", "Cannot create the RPC hosts access control list, db_get_value() status %d",
             status);
      return;
   }
 
   size = sizeof(i);
   i = 0;
   status = db_get_value(hDB, 0, "/Experiment/Security/Disable RPC hosts check", &i, &size, TID_BOOL, TRUE);
 
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "init_rpc_hosts", "Cannot create \"Disable RPC hosts check\", db_get_value() status %d", status);
      return;
   }
 
   if (i != 0) // RPC hosts check is disabled
      return;
 
   status = db_find_key(hDB, 0, "/Experiment/Security/RPC hosts/Allowed hosts", &hKey);
 
   if (status != DB_SUCCESS || hKey == 0) {
      cm_msg(MERROR, "init_rpc_hosts", "Cannot find the RPC hosts access control list, db_find_key() status %d",
             status);
      return;
   }
 
   load_rpc_hosts(hDB, hKey, -99, NULL);
 
   status = db_watch(hDB, hKey, load_rpc_hosts, NULL);
 
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "init_rpc_hosts", "Cannot watch the RPC hosts access control list, db_watch() status %d", status);
      return;
   }
}
 
/********************************************************************/
INT cm_register_server(void)
/********************************************************************\
 
  Routine: cm_register_server
 
  Purpose: Register a server which can be called from other clients
           of a specific experiment.
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    CM_SUCCESS              Successful completion
 
\********************************************************************/
{
   if (!_rpc_registered) {
      INT status;
      int size;
      HNDLE hDB, hKey;
      char name[NAME_LENGTH];
      char str[256];
      int port = 0;
 
      cm_get_experiment_database(&hDB, &hKey);
 
      size = sizeof(name);
      status = db_get_value(hDB, hKey, "Name", &name, &size, TID_STRING, FALSE);
 
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_register_server", "cannot get client name, db_get_value() status %d", status);
         return status;
      }
 
      mstrlcpy(str, "/Experiment/Security/RPC ports/", sizeof(str));
      mstrlcat(str, name, sizeof(str));
 
      size = sizeof(port);
      status = db_get_value(hDB, 0, str, &port, &size, TID_UINT32, TRUE);
 
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_register_server", "cannot get RPC port number, db_get_value(%s) status %d", str, status);
         return status;
      }
 
      int lport = 0; // actual port number assigned to us by the OS
 
      status = rpc_register_server(port, &_rpc_listen_socket, &lport);
      if (status != RPC_SUCCESS) {
         cm_msg(MERROR, "cm_register_server", "error, rpc_register_server(port=%d) status %d", port, status);
         return status;
      }
 
      _rpc_registered = TRUE;
 
      /* register MIDAS library functions */
      rpc_register_functions(rpc_get_internal_list(1), NULL);
 
      /* store port number in ODB */
 
      status = db_find_key(hDB, hKey, "Server Port", &hKey);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_register_server", "error, db_find_key(\"Server Port\") status %d", status);
         return status;
      }
 
      /* unlock database */
      db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
 
      /* set value */
      status = db_set_data(hDB, hKey, &lport, sizeof(INT), 1, TID_INT32);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_register_server", "error, db_set_data(\"Server Port\"=%d) status %d", port, status);
         return status;
      }
 
      /* lock database */
      db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
      init_rpc_hosts(hDB);
   }
 
   return CM_SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT cm_register_transition(INT transition, INT(*func)(INT, char *), INT sequence_number) {
   INT status;
   HNDLE hDB, hKey, hKeyTrans;
   KEY key;
   char str[256];
 
   /* check for valid transition */
   if (transition != TR_START && transition != TR_STOP && transition != TR_PAUSE && transition != TR_RESUME && transition != TR_STARTABORT) {
      cm_msg(MERROR, "cm_register_transition", "Invalid transition request \"%d\"", transition);
      return CM_INVALID_TRANSITION;
   }
 
   cm_get_experiment_database(&hDB, &hKey);
 
   rpc_register_function(RPC_RC_TRANSITION, rpc_transition_dispatch);
 
   /* register new transition request */
 
   {
      std::lock_guard<std::mutex> guard(_trans_table_mutex);
 
      for (size_t i = 0; i < _trans_table.size(); i++) {
         if (_trans_table[i].transition == transition && _trans_table[i].sequence_number == sequence_number) {
            cm_msg(MERROR, "cm_register_transition", "transition %s with sequence number %d is already registered", cm_transition_name(transition).c_str(), sequence_number);
            return CM_INVALID_TRANSITION;
         }
      }
 
      bool found = false;
      for (size_t i = 0; i < _trans_table.size(); i++) {
         if (!_trans_table[i].transition) {
            _trans_table[i].transition = transition;
            _trans_table[i].sequence_number = sequence_number;
            _trans_table[i].func = func;
            found = true;
            break;
         }
      }
 
      if (!found) {
         TRANS_TABLE tt;
         tt.transition = transition;
         tt.sequence_number = sequence_number;
         tt.func = func;
         _trans_table.push_back(tt);
      }
 
      // implicit unlock
   }
 
   sprintf(str, "Transition %s", cm_transition_name(transition).c_str());
 
   /* unlock database */
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE | MODE_DELETE, TRUE);
 
   /* set value */
   status = db_find_key(hDB, hKey, str, &hKeyTrans);
   if (!hKeyTrans) {
      status = db_set_value(hDB, hKey, str, &sequence_number, sizeof(INT), 1, TID_INT32);
      if (status != DB_SUCCESS)
         return status;
   } else {
      status = db_get_key(hDB, hKeyTrans, &key);
      if (status != DB_SUCCESS)
         return status;
      status = db_set_data_index(hDB, hKeyTrans, &sequence_number, sizeof(INT), key.num_values, TID_INT32);
      if (status != DB_SUCCESS)
         return status;
   }
 
   /* re-lock database */
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   return CM_SUCCESS;
}
 
INT cm_deregister_transition(INT transition) {
   INT status;
   HNDLE hDB, hKey, hKeyTrans;
   char str[256];
 
   /* check for valid transition */
   if (transition != TR_START && transition != TR_STOP && transition != TR_PAUSE && transition != TR_RESUME && transition != TR_STARTABORT) {
      cm_msg(MERROR, "cm_deregister_transition", "Invalid transition request \"%d\"", transition);
      return CM_INVALID_TRANSITION;
   }
 
   cm_get_experiment_database(&hDB, &hKey);
 
   {
      std::lock_guard<std::mutex> guard(_trans_table_mutex);
 
      /* remove existing transition request */
      for (size_t i = 0; i < _trans_table.size(); i++) {
         if (_trans_table[i].transition == transition) {
            _trans_table[i].transition = 0;
            _trans_table[i].sequence_number = 0;
            _trans_table[i].func = NULL;
         }
      }
 
      // implicit unlock
   }
      
   sprintf(str, "Transition %s", cm_transition_name(transition).c_str());
 
   /* unlock database */
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE | MODE_DELETE, TRUE);
 
   /* set value */
   status = db_find_key(hDB, hKey, str, &hKeyTrans);
   if (hKeyTrans) {
      status = db_delete_key(hDB, hKeyTrans);
      if (status != DB_SUCCESS)
         return status;
   }
 
   /* re-lock database */
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_set_transition_sequence(INT transition, INT sequence_number) {
   INT status;
   HNDLE hDB, hKey;
   char str[256];
 
   /* check for valid transition */
   if (transition != TR_START && transition != TR_STOP && transition != TR_PAUSE && transition != TR_RESUME) {
      cm_msg(MERROR, "cm_set_transition_sequence", "Invalid transition request \"%d\"", transition);
      return CM_INVALID_TRANSITION;
   }
 
   {
      std::lock_guard<std::mutex> guard(_trans_table_mutex);
 
      int count = 0;
      for (size_t i = 0; i < _trans_table.size(); i++) {
         if (_trans_table[i].transition == transition) {
            _trans_table[i].sequence_number = sequence_number;
            count++;
         }
      }
 
      if (count == 0) {
         cm_msg(MERROR, "cm_set_transition_sequence", "transition %s is not registered", cm_transition_name(transition).c_str());
         return CM_INVALID_TRANSITION;
      } else if (count > 1) {
         cm_msg(MERROR, "cm_set_transition_sequence", "cannot change sequence number, transition %s is registered %d times", cm_transition_name(transition).c_str(), count);
         return CM_INVALID_TRANSITION;
      }
 
      /* Change local sequence number for this transition type */
 
      for (size_t i = 0; i < _trans_table.size(); i++) {
         if (_trans_table[i].transition == transition) {
            _trans_table[i].sequence_number = sequence_number;
         }
      }
 
      // implicit unlock
   }
 
   cm_get_experiment_database(&hDB, &hKey);
 
   /* unlock database */
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
 
   sprintf(str, "Transition %s", cm_transition_name(transition).c_str());
 
   /* set value */
   status = db_set_value(hDB, hKey, str, &sequence_number, sizeof(INT), 1, TID_INT32);
   if (status != DB_SUCCESS)
      return status;
 
   /* re-lock database */
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   return CM_SUCCESS;
 
}
 
INT cm_set_client_run_state(INT state) {
   INT status;
   HNDLE hDB, hKey;
   KEY key;
 
   cm_get_experiment_database(&hDB, &hKey);
 
   /* check that hKey is still valid */
   status = db_get_key(hDB, hKey, &key);
 
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_set_client_run_state",
             "Cannot set client run state, client hKey %d into /System/Clients is not valid, maybe this client was removed by a watchdog timeout",
             hKey);
      return status;
   }
 
   /* unlock database */
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
 
   /* set value */
   status = db_set_value(hDB, hKey, "Run state", &state, sizeof(INT), 1, TID_INT32);
   if (status != DB_SUCCESS)
      return status;
 
   /* re-lock database */
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   return CM_SUCCESS;
 
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
static INT _requested_transition;
static DWORD _deferred_transition_mask;
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT cm_register_deferred_transition(INT transition, BOOL(*func)(INT, BOOL)) {
   INT status, size;
   char tr_key_name[256];
   HNDLE hDB, hKey;
 
   cm_get_experiment_database(&hDB, &hKey);
 
   for (int i = 0; _deferred_trans_table[i].transition; i++)
      if (_deferred_trans_table[i].transition == transition)
         _deferred_trans_table[i].func = (int (*)(int, char *)) func;
 
   /* set new transition mask */
   _deferred_transition_mask |= transition;
 
   sprintf(tr_key_name, "Transition %s DEFERRED", cm_transition_name(transition).c_str());
 
   /* unlock database */
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
 
   /* set value */
   int i = 0;
   status = db_set_value(hDB, hKey, tr_key_name, &i, sizeof(INT), 1, TID_INT32);
   if (status != DB_SUCCESS)
      return status;
 
   /* re-lock database */
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   /* hot link requested transition */
   size = sizeof(_requested_transition);
   db_get_value(hDB, 0, "/Runinfo/Requested Transition", &_requested_transition, &size, TID_INT32, TRUE);
   db_find_key(hDB, 0, "/Runinfo/Requested Transition", &hKey);
   status = db_open_record(hDB, hKey, &_requested_transition, sizeof(INT), MODE_READ, NULL, NULL);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_register_deferred_transition", "Cannot hotlink /Runinfo/Requested Transition");
      return status;
   }
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_check_deferred_transition() {
   INT i, status;
   char str[256];
   static BOOL first;
 
   if (_requested_transition == 0)
      first = TRUE;
 
   if (_requested_transition & _deferred_transition_mask) {
      for (i = 0; _deferred_trans_table[i].transition; i++)
         if (_deferred_trans_table[i].transition == _requested_transition)
            break;
 
      if (_deferred_trans_table[i].transition == _requested_transition) {
         if (((BOOL(*)(INT, BOOL)) _deferred_trans_table[i].func)(_requested_transition, first)) {
            status = cm_transition(_requested_transition | TR_DEFERRED, 0, str, sizeof(str), TR_SYNC, FALSE);
            if (status != CM_SUCCESS)
               cm_msg(MERROR, "cm_check_deferred_transition", "Cannot perform deferred transition: %s", str);
 
            /* bypass hotlink and set _requested_transition directly to zero */
            _requested_transition = 0;
 
            return status;
         }
         first = FALSE;
      }
   }
 
   return SUCCESS;
}
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
struct TrClient {
   int transition = 0;
   int run_number = 0;
   int async_flag = 0;
   int debug_flag = 0;
   int sequence_number = 0;
   std::vector<int> wait_for_index;
   std::string host_name;
   std::string client_name;
   int port = 0;
   std::string key_name; /* this client key name in /System/Clients */
   std::atomic_int status{0};
   std::thread* thread = NULL;
   std::string errorstr;
   DWORD init_time = 0;    // time when tr_client created
   std::string waiting_for_client; // name of client we are waiting for
   DWORD connect_timeout = 0;
   DWORD connect_start_time = 0; // time when client rpc connection is started
   DWORD connect_end_time = 0;   // time when client rpc connection is finished
   DWORD rpc_timeout = 0;
   DWORD rpc_start_time = 0;     // time client rpc call is started
   DWORD rpc_end_time = 0;       // time client rpc call is finished
   DWORD end_time = 0;           // time client thread is finished
 
   TrClient() // ctor
   {
      // empty
   }
 
   ~TrClient() // dtor
   {
      //printf("TrClient::dtor: client \"%s\"\n", client_name);
      assert(thread == NULL);
   }
 
   void Print() const
   {
      printf("client \"%s\", transition %d, seqno %d, status %d", client_name.c_str(), transition, sequence_number, int(status));
      if (wait_for_index.size() > 0) {
         printf(", wait for:");
         for (size_t i=0; i<wait_for_index.size(); i++) {
            printf(" %d", wait_for_index[i]);
         }
      }
   }
};
 
static bool tr_compare(const std::unique_ptr<TrClient>& arg1, const std::unique_ptr<TrClient>& arg2) {
   return arg1->sequence_number < arg2->sequence_number;
}
 
/*------------------------------------------------------------------*/
 
struct TrState {
   int transition = 0;
   int run_number = 0;
   int async_flag = 0;
   int debug_flag = 0;
   int status     = 0;
   std::string errorstr;
   DWORD start_time = 0;
   DWORD end_time   = 0;
   std::vector<std::unique_ptr<TrClient>> clients;
};
 
/*------------------------------------------------------------------*/
 
static int tr_finish(HNDLE hDB, TrState* tr, int transition, int status, const char *errorstr)
{
   DWORD end_time = ss_millitime();
 
   if (transition != TR_STARTABORT) {
      db_set_value(hDB, 0, "/System/Transition/end_time", &end_time, sizeof(DWORD), 1, TID_UINT32);
      db_set_value(hDB, 0, "/System/Transition/status", &status, sizeof(INT), 1, TID_INT32);
 
      if (errorstr) {
         db_set_value(hDB, 0, "/System/Transition/error", errorstr, strlen(errorstr) + 1, 1, TID_STRING);
      } else if (status == CM_SUCCESS) {
         const char *buf = "Success";
         db_set_value(hDB, 0, "/System/Transition/error", buf, strlen(buf) + 1, 1, TID_STRING);
      } else {
         char buf[256];
         sprintf(buf, "status %d", status);
         db_set_value(hDB, 0, "/System/Transition/error", buf, strlen(buf) + 1, 1, TID_STRING);
      }
   }
 
   tr->status = status;
   tr->end_time = end_time;
   if (errorstr) {
      tr->errorstr = errorstr;
   } else {
      tr->errorstr = "(null)";
   }
 
   return status;
}
 
/*------------------------------------------------------------------*/
 
static void write_tr_client_to_odb(HNDLE hDB, const TrClient *tr_client) {
   //printf("Writing client [%s] to ODB\n", tr_client->client_name.c_str());
 
   int status;
   HNDLE hKey;
 
   if (tr_client->transition == TR_STARTABORT) {
      status = db_create_key(hDB, 0, "/System/Transition/TR_STARTABORT", TID_KEY);
      status = db_find_key(hDB, 0, "/System/Transition/TR_STARTABORT", &hKey);
      if (status != DB_SUCCESS)
         return;
   } else {
      status = db_create_key(hDB, 0, "/System/Transition/Clients", TID_KEY);
      status = db_find_key(hDB, 0, "/System/Transition/Clients", &hKey);
      if (status != DB_SUCCESS)
         return;
   }
 
   // same client_name can exist with different sequence numbers!
   std::string keyname = msprintf("%s_%d", tr_client->client_name.c_str(), tr_client->sequence_number);
 
   status = db_create_key(hDB, hKey, keyname.c_str(), TID_KEY);
   status = db_find_key(hDB, hKey, keyname.c_str(), &hKey);
   if (status != DB_SUCCESS)
      return;
   
   DWORD now = ss_millitime();
 
   //int   transition;
   //int   run_number;
   //int   async_flag;
   //int   debug_flag;
   status = db_set_value(hDB, hKey, "sequence_number", &tr_client->sequence_number, sizeof(INT), 1, TID_INT32);
   status = db_set_value(hDB, hKey, "client_name", tr_client->client_name.c_str(), tr_client->client_name.length() + 1, 1, TID_STRING);
   status = db_set_value(hDB, hKey, "host_name", tr_client->host_name.c_str(), tr_client->host_name.length() + 1, 1, TID_STRING);
   status = db_set_value(hDB, hKey, "port", &tr_client->port, sizeof(INT), 1, TID_INT32);
   status = db_set_value(hDB, hKey, "init_time", &tr_client->init_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "waiting_for_client", tr_client->waiting_for_client.c_str(), tr_client->waiting_for_client.length() + 1, 1, TID_STRING);
   status = db_set_value(hDB, hKey, "connect_timeout", &tr_client->connect_timeout, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "connect_start_time", &tr_client->connect_start_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "connect_end_time", &tr_client->connect_end_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "rpc_timeout", &tr_client->rpc_timeout, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "rpc_start_time", &tr_client->rpc_start_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "rpc_end_time", &tr_client->rpc_end_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "end_time", &tr_client->end_time, sizeof(DWORD), 1, TID_UINT32);
   status = db_set_value(hDB, hKey, "status", &tr_client->status, sizeof(INT), 1, TID_INT32);
   status = db_set_value(hDB, hKey, "error", tr_client->errorstr.c_str(), tr_client->errorstr.length() + 1, 1, TID_STRING);
   status = db_set_value(hDB, hKey, "last_updated", &now, sizeof(DWORD), 1, TID_UINT32);
}
 
/*------------------------------------------------------------------*/
 
/* Perform a detached transition through the external "mtransition" program */
static int cm_transition_detach(INT transition, INT run_number, char *errstr, INT errstr_size, INT async_flag, INT debug_flag) {
   HNDLE hDB;
   int status;
   const char *args[100];
   std::string path;
   char debug_arg[256];
   char start_arg[256];
   std::string expt_name;
   std::string mserver_hostname;
 
   int iarg = 0;
 
   cm_get_experiment_database(&hDB, NULL);
 
   const char *midassys = getenv("MIDASSYS");
   if (midassys) {
      path += midassys;
      path += DIR_SEPARATOR_STR;
      path += "bin";
      path += DIR_SEPARATOR_STR;
   }
   path += "mtransition";
 
   args[iarg++] = path.c_str();
 
   if (rpc_is_remote()) {
      /* if connected to mserver, pass connection info to mtransition */
      mserver_hostname = rpc_get_mserver_hostname();
      args[iarg++] = "-h";
      args[iarg++] = mserver_hostname.c_str();
   }
 
   /* get experiment name from ODB */
   db_get_value_string(hDB, 0, "/Experiment/Name", 0, &expt_name, FALSE);
 
   if (expt_name.length() > 0) {
      args[iarg++] = "-e";
      args[iarg++] = expt_name.c_str();
   }
 
   if (debug_flag) {
      args[iarg++] = "-d";
 
      sprintf(debug_arg, "%d", debug_flag);
      args[iarg++] = debug_arg;
   }
 
   if (transition == TR_STOP)
      args[iarg++] = "STOP";
   else if (transition == TR_PAUSE)
      args[iarg++] = "PAUSE";
   else if (transition == TR_RESUME)
      args[iarg++] = "RESUME";
   else if (transition == TR_START) {
      args[iarg++] = "START";
 
      sprintf(start_arg, "%d", run_number);
      args[iarg++] = start_arg;
   }
 
   args[iarg++] = NULL;
 
#if 0
   for (iarg = 0; args[iarg] != NULL; iarg++) {
      printf("arg[%d] [%s]\n", iarg, args[iarg]);
   }
#endif
 
   status = ss_spawnv(P_DETACH, args[0], args);
 
   if (status != SS_SUCCESS) {
      if (errstr != NULL) {
         sprintf(errstr, "Cannot execute mtransition, ss_spawnv() returned %d", status);
      }
      return CM_SET_ERROR;
   }
 
   return CM_SUCCESS;
}
 
/*------------------------------------------------------------------*/
 
/* contact a client via RPC and execute the remote transition */
static int cm_transition_call(TrState* s, int idx) {
   INT old_timeout, status, i, t1, t0, size;
   HNDLE hDB;
   HNDLE hConn = -1;
   int connect_timeout = 10000;
   int timeout = 120000;
 
   cm_get_experiment_database(&hDB, NULL);
   assert(hDB);
 
   TrClient *tr_client = s->clients[idx].get();
 
   tr_client->errorstr = "";
   //tr_client->init_time = ss_millitime();
   tr_client->waiting_for_client = "";
   tr_client->connect_timeout = 0;
   tr_client->connect_start_time = 0;
   tr_client->connect_end_time = 0;
   tr_client->rpc_timeout = 0;
   tr_client->rpc_start_time = 0;
   tr_client->rpc_end_time = 0;
   tr_client->end_time = 0;
 
   write_tr_client_to_odb(hDB, tr_client);
 
   /* wait for predecessor if set */
   if (tr_client->async_flag & TR_MTHREAD && !tr_client->wait_for_index.empty()) {
      while (1) {
         TrClient* wait_for = NULL;
 
         for (size_t i = 0; i < tr_client->wait_for_index.size(); i++) {
            int wait_for_index = tr_client->wait_for_index[i];
 
            assert(wait_for_index >= 0);
            assert(wait_for_index < (int)s->clients.size());
 
            TrClient *t = s->clients[wait_for_index].get();
 
            if (!t)
               continue;
 
            if (t->status == 0) {
               wait_for = t;
               break;
            }
 
            if (t->status != SUCCESS && tr_client->transition != TR_STOP) {
               cm_msg(MERROR, "cm_transition_call", "Transition %d aborted: client \"%s\" returned status %d", tr_client->transition, t->client_name.c_str(), int(t->status));
               tr_client->status = -1;
               tr_client->errorstr = msprintf("Aborted by failure of client \"%s\"", t->client_name.c_str());
               tr_client->end_time = ss_millitime();
               write_tr_client_to_odb(hDB, tr_client);
               return CM_SUCCESS;
            }
         }
 
         if (wait_for == NULL)
            break;
 
         tr_client->waiting_for_client = wait_for->client_name;
         write_tr_client_to_odb(hDB, tr_client);
 
         if (tr_client->debug_flag == 1)
            printf("Client \"%s\" waits for client \"%s\"\n", tr_client->client_name.c_str(), wait_for->client_name.c_str());
 
         i = 0;
         size = sizeof(i);
         status = db_get_value(hDB, 0, "/Runinfo/Transition in progress", &i, &size, TID_INT32, FALSE);
 
         if (status == DB_SUCCESS && i == 0) {
            cm_msg(MERROR, "cm_transition_call", "Client \"%s\" transition %d aborted while waiting for client \"%s\": \"/Runinfo/Transition in progress\" was cleared", tr_client->client_name.c_str(), tr_client->transition, wait_for->client_name.c_str());
            tr_client->status = -1;
            tr_client->errorstr = "Canceled";
            tr_client->end_time = ss_millitime();
            write_tr_client_to_odb(hDB, tr_client);
            return CM_SUCCESS;
         }
 
         ss_sleep(100);
      };
   }
 
   tr_client->waiting_for_client[0] = 0;
 
   /* contact client if transition mask set */
   if (tr_client->debug_flag == 1)
      printf("Connecting to client \"%s\" on host %s...\n", tr_client->client_name.c_str(), tr_client->host_name.c_str());
   if (tr_client->debug_flag == 2)
      cm_msg(MINFO, "cm_transition_call", "cm_transition_call: Connecting to client \"%s\" on host %s...", tr_client->client_name.c_str(), tr_client->host_name.c_str());
 
   /* get transition timeout for rpc connect */
   size = sizeof(timeout);
   db_get_value(hDB, 0, "/Experiment/Transition connect timeout", &connect_timeout, &size, TID_INT32, TRUE);
 
   if (connect_timeout < 1000)
      connect_timeout = 1000;
 
   /* get transition timeout */
   size = sizeof(timeout);
   db_get_value(hDB, 0, "/Experiment/Transition timeout", &timeout, &size, TID_INT32, TRUE);
 
   if (timeout < 1000)
      timeout = 1000;
 
   /* set our timeout for rpc_client_connect() */
   //old_timeout = rpc_get_timeout(RPC_HNDLE_CONNECT);
   rpc_set_timeout(RPC_HNDLE_CONNECT, connect_timeout, &old_timeout);
 
   tr_client->connect_timeout = connect_timeout;
   tr_client->connect_start_time = ss_millitime();
 
   write_tr_client_to_odb(hDB, tr_client);
 
   /* client found -> connect to its server port */
   status = rpc_client_connect(tr_client->host_name.c_str(), tr_client->port, tr_client->client_name.c_str(), &hConn);
 
   rpc_set_timeout(RPC_HNDLE_CONNECT, old_timeout);
 
   tr_client->connect_end_time = ss_millitime();
   write_tr_client_to_odb(hDB, tr_client);
 
   if (status != RPC_SUCCESS) {
      cm_msg(MERROR, "cm_transition_call",
             "cannot connect to client \"%s\" on host %s, port %d, status %d",
             tr_client->client_name.c_str(), tr_client->host_name.c_str(), tr_client->port, status);
      tr_client->errorstr = msprintf("Cannot connect to client \"%s\"", tr_client->client_name.c_str());
 
      /* clients that do not respond to transitions are dead or defective, get rid of them. K.O. */
      cm_shutdown(tr_client->client_name.c_str(), TRUE);
      cm_cleanup(tr_client->client_name.c_str(), TRUE);
 
      if (tr_client->transition != TR_STOP) {
         /* indicate abort */
         i = 1;
         db_set_value(hDB, 0, "/Runinfo/Start abort", &i, sizeof(INT), 1, TID_INT32);
         i = 0;
         db_set_value(hDB, 0, "/Runinfo/Transition in progress", &i, sizeof(INT), 1, TID_INT32);
      }
 
      tr_client->status = status;
      tr_client->end_time = ss_millitime();
 
      write_tr_client_to_odb(hDB, tr_client);
      return status;
   }
 
   if (tr_client->debug_flag == 1)
      printf("Connection established to client \"%s\" on host %s\n", tr_client->client_name.c_str(), tr_client->host_name.c_str());
   if (tr_client->debug_flag == 2)
      cm_msg(MINFO, "cm_transition_call",
             "cm_transition: Connection established to client \"%s\" on host %s",
             tr_client->client_name.c_str(), tr_client->host_name.c_str());
 
   /* call RC_TRANSITION on remote client with increased timeout */
   //old_timeout = rpc_get_timeout(hConn);
   rpc_set_timeout(hConn, timeout, &old_timeout);
 
   tr_client->rpc_timeout = timeout;
   tr_client->rpc_start_time = ss_millitime();
   write_tr_client_to_odb(hDB, tr_client);
 
   if (tr_client->debug_flag == 1)
      printf("Executing RPC transition client \"%s\" on host %s...\n",
             tr_client->client_name.c_str(), tr_client->host_name.c_str());
   if (tr_client->debug_flag == 2)
      cm_msg(MINFO, "cm_transition_call",
             "cm_transition: Executing RPC transition client \"%s\" on host %s...",
             tr_client->client_name.c_str(), tr_client->host_name.c_str());
 
   t0 = ss_millitime();
 
   char errorstr[TRANSITION_ERROR_STRING_LENGTH];
   errorstr[0] = 0;
 
   status = rpc_client_call(hConn, RPC_RC_TRANSITION, tr_client->transition, tr_client->run_number, errorstr, sizeof(errorstr), tr_client->sequence_number);
 
   tr_client->errorstr = errorstr;
 
   t1 = ss_millitime();
 
   tr_client->rpc_end_time = ss_millitime();
 
   write_tr_client_to_odb(hDB, tr_client);
 
   /* fix for clients returning 0 as error code */
   if (status == 0)
      status = FE_ERR_HW;
 
   /* reset timeout */
   rpc_set_timeout(hConn, old_timeout);
 
   //DWORD t2 = ss_millitime();
 
   if (tr_client->debug_flag == 1)
      printf("RPC transition finished client \"%s\" on host \"%s\" in %d ms with status %d\n",
             tr_client->client_name.c_str(), tr_client->host_name.c_str(), t1 - t0, status);
   if (tr_client->debug_flag == 2)
      cm_msg(MINFO, "cm_transition_call",
             "cm_transition: RPC transition finished client \"%s\" on host \"%s\" in %d ms with status %d",
             tr_client->client_name.c_str(), tr_client->host_name.c_str(), t1 - t0, status);
 
   if (status == RPC_NET_ERROR || status == RPC_TIMEOUT) {
      tr_client->errorstr = msprintf("RPC network error or timeout from client \'%s\' on host \"%s\"", tr_client->client_name.c_str(), tr_client->host_name.c_str());
      /* clients that do not respond to transitions are dead or defective, get rid of them. K.O. */
      cm_shutdown(tr_client->client_name.c_str(), TRUE);
      cm_cleanup(tr_client->client_name.c_str(), TRUE);
   } else if (status != CM_SUCCESS && tr_client->errorstr.empty()) {
      tr_client->errorstr = msprintf("Unknown error %d from client \'%s\' on host \"%s\"", status, tr_client->client_name.c_str(), tr_client->host_name.c_str());
   }
 
   tr_client->status = status;
   tr_client->end_time = ss_millitime();
 
   // write updated status and end_time to ODB
 
   write_tr_client_to_odb(hDB, tr_client);
 
#if 0
   printf("hconn %d cm_transition_call(%s) finished init %d connect %d end %d rpc %d end %d xxx %d end %d\n",
          hConn,
          tr_client->client_name.c_str(),
          tr_client->init_time - tr_client->init_time,
          tr_client->connect_start_time - tr_client->init_time,
          tr_client->connect_end_time - tr_client->init_time,
          tr_client->rpc_start_time - tr_client->init_time,
          tr_client->rpc_end_time - tr_client->init_time,
          t2 - tr_client->init_time,
          tr_client->end_time - tr_client->init_time);
#endif
 
   return CM_SUCCESS;
}
 
/*------------------------------------------------------------------*/
 
static int cm_transition_call_direct(TrClient *tr_client)
{
   HNDLE hDB;
 
   cm_get_experiment_database(&hDB, NULL);
 
   DWORD now = ss_millitime();
 
   tr_client->errorstr = "";
   //tr_client->init_time = now;
   tr_client->waiting_for_client = "";
   tr_client->connect_timeout = 0;
   tr_client->connect_start_time = now;
   tr_client->connect_end_time = now;
   tr_client->rpc_timeout = 0;
   tr_client->rpc_start_time = 0;
   tr_client->rpc_end_time = 0;
   tr_client->end_time = 0;
 
   write_tr_client_to_odb(hDB, tr_client);
 
   // find registered handler
   // NB: this code should match same code in rpc_transition_dispatch()
   // NB: only use the first handler, this is how MIDAS always worked
   // NB: we could run all handlers, but we can return the status and error string of only one of them.
 
   _trans_table_mutex.lock();
   size_t n = _trans_table.size();
   _trans_table_mutex.unlock();
 
   for (size_t i = 0; i < n; i++) {
      _trans_table_mutex.lock();
      TRANS_TABLE tt = _trans_table[i];
      _trans_table_mutex.unlock();
      if (tt.transition == tr_client->transition && tt.sequence_number == tr_client->sequence_number) {
         /* call registered function */
         if (tt.func) {
            if (tr_client->debug_flag == 1)
               printf("Calling local transition callback\n");
            if (tr_client->debug_flag == 2)
               cm_msg(MINFO, "cm_transition_call_direct", "cm_transition: Calling local transition callback");
            
            tr_client->rpc_start_time = ss_millitime();
 
            write_tr_client_to_odb(hDB, tr_client);
 
            char errorstr[TRANSITION_ERROR_STRING_LENGTH];
            errorstr[0] = 0;
            
            tr_client->status = tt.func(tr_client->run_number, errorstr);
 
            tr_client->errorstr = errorstr;
            
            tr_client->rpc_end_time = ss_millitime();
            
            if (tr_client->debug_flag == 1)
               printf("Local transition callback finished, status %d\n", int(tr_client->status));
            if (tr_client->debug_flag == 2)
               cm_msg(MINFO, "cm_transition_call_direct", "cm_transition: Local transition callback finished, status %d", int(tr_client->status));
 
            tr_client->end_time = ss_millitime();
 
            // write status and end_time to ODB
 
            write_tr_client_to_odb(hDB, tr_client);
 
            return tr_client->status;
         }
      }
   }
 
   cm_msg(MERROR, "cm_transition_call_direct", "no handler for transition %d with sequence number %d", tr_client->transition, tr_client->sequence_number);
 
   tr_client->status = CM_SUCCESS;
   tr_client->end_time = ss_millitime();
 
   // write status and end_time to ODB
 
   write_tr_client_to_odb(hDB, tr_client);
 
   return CM_SUCCESS;
}
 
/********************************************************************/
static INT cm_transition2(INT transition, INT run_number, char *errstr, INT errstr_size, INT async_flag, INT debug_flag)
{
   INT i, status, size, sequence_number, port, state;
   HNDLE hDB, hRootKey, hSubkey, hKey, hKeylocal, hKeyTrans;
   DWORD seconds;
   char tr_key_name[256];
   KEY key;
   BOOL deferred;
   char xerrstr[TRANSITION_ERROR_STRING_LENGTH];
 
   //printf("cm_transition2: transition %d, run_number %d, errstr %p, errstr_size %d, async_flag %d, debug_flag %d\n", transition, run_number, errstr, errstr_size, async_flag, debug_flag);
 
   /* if needed, use internal error string */
   if (!errstr) {
      errstr = xerrstr;
      errstr_size = sizeof(xerrstr);
   }
 
   /* erase error string */
   errstr[0] = 0;
 
   /* get key of local client */
   cm_get_experiment_database(&hDB, &hKeylocal);
 
   deferred = (transition & TR_DEFERRED) > 0;
   transition &= ~TR_DEFERRED;
 
   /* check for valid transition */
   if (transition != TR_START && transition != TR_STOP && transition != TR_PAUSE && transition != TR_RESUME
       && transition != TR_STARTABORT) {
      cm_msg(MERROR, "cm_transition", "Invalid transition request \"%d\"", transition);
      mstrlcpy(errstr, "Invalid transition request", errstr_size);
      return CM_INVALID_TRANSITION;
   }
 
   /* check if transition in progress */
   if (!deferred) {
      i = 0;
      size = sizeof(i);
      db_get_value(hDB, 0, "/Runinfo/Transition in progress", &i, &size, TID_INT32, TRUE);
      if (i == 1) {
         if (errstr) {
            sprintf(errstr, "Start/Stop transition %d already in progress, please try again later\n", i);
            mstrlcat(errstr, "or set \"/Runinfo/Transition in progress\" manually to zero.\n", errstr_size);
         }
         cm_msg(MERROR, "cm_transition", "another transition is already in progress");
         return CM_TRANSITION_IN_PROGRESS;
      }
   }
 
   /* indicate transition in progress */
   i = transition;
   db_set_value(hDB, 0, "/Runinfo/Transition in progress", &i, sizeof(INT), 1, TID_INT32);
 
   /* clear run abort flag */
   i = 0;
   db_set_value(hDB, 0, "/Runinfo/Start abort", &i, sizeof(INT), 1, TID_INT32);
 
   /* construct new transition state */
 
   TrState s;
   
   s.transition = transition;
   s.run_number = run_number;
   s.async_flag = async_flag;
   s.debug_flag = debug_flag;
   s.status = 0;
   s.errorstr[0] = 0;
   s.start_time = ss_millitime();
   s.end_time = 0;
 
   /* construct the ODB tree /System/Transition */
 
   status = db_delete(hDB, 0, "/System/Transition/TR_STARTABORT");
 
   if (transition != TR_STARTABORT) {
      status = db_delete(hDB, 0, "/System/Transition/Clients");
   }
 
   if (transition != TR_STARTABORT) {
      db_set_value(hDB, 0, "/System/Transition/transition", &transition, sizeof(INT), 1, TID_INT32);
      db_set_value(hDB, 0, "/System/Transition/run_number", &run_number, sizeof(INT), 1, TID_INT32);
      db_set_value(hDB, 0, "/System/Transition/start_time", &s.start_time, sizeof(DWORD), 1, TID_UINT32);
      db_set_value(hDB, 0, "/System/Transition/end_time", &s.end_time, sizeof(DWORD), 1, TID_UINT32);
      status = 0;
      db_set_value(hDB, 0, "/System/Transition/status", &status, sizeof(INT), 1, TID_INT32);
      db_set_value(hDB, 0, "/System/Transition/error", "", 1, 1, TID_STRING);
      db_set_value(hDB, 0, "/System/Transition/deferred", "", 1, 1, TID_STRING);
   }
 
   /* check for alarms */
   i = 0;
   size = sizeof(i);
   db_get_value(hDB, 0, "/Experiment/Prevent start on alarms", &i, &size, TID_BOOL, TRUE);
   if (i == TRUE && transition == TR_START) {
      al_check();
      std::string alarms;
      if (al_get_alarms(&alarms) > 0) {
         cm_msg(MERROR, "cm_transition", "Run start abort due to alarms: %s", alarms.c_str());
         mstrlcpy(errstr, "Cannot start run due to alarms: ", errstr_size);
         mstrlcat(errstr, alarms.c_str(), errstr_size);
         return tr_finish(hDB, &s, transition, AL_TRIGGERED, errstr);
      }
   }
 
   /* check for required programs */
   i = 0;
   size = sizeof(i);
   db_get_value(hDB, 0, "/Experiment/Prevent start on required progs", &i, &size, TID_BOOL, TRUE);
   if (i == TRUE && transition == TR_START) {
 
      HNDLE hkeyroot, hkey;
 
      /* check /programs alarms */
      db_find_key(hDB, 0, "/Programs", &hkeyroot);
      if (hkeyroot) {
         for (i = 0;; i++) {
            BOOL program_info_required = FALSE;
            status = db_enum_key(hDB, hkeyroot, i, &hkey);
            if (status == DB_NO_MORE_SUBKEYS)
               break;
 
            db_get_key(hDB, hkey, &key);
 
            /* don't check "execute on xxx" */
            if (key.type != TID_KEY)
               continue;
 
            size = sizeof(program_info_required);
            status = db_get_value(hDB, hkey, "Required", &program_info_required, &size, TID_BOOL, TRUE);
            if (status != DB_SUCCESS) {
               cm_msg(MERROR, "cm_transition", "Cannot get program info required, status %d", status);
               continue;
            }
 
            if (program_info_required) {
               std::string name = rpc_get_name();
               std::string str = name;
               str.resize(strlen(key.name));
               if (!equal_ustring(str.c_str(), key.name) && cm_exist(key.name, FALSE) == CM_NO_CLIENT) {
                  cm_msg(MERROR, "cm_transition", "Run start abort due to program \"%s\" not running", key.name);
                  std::string serrstr = msprintf("Run start abort due to program \"%s\" not running", key.name);
                  mstrlcpy(errstr, serrstr.c_str(), errstr_size);
                  return tr_finish(hDB, &s, transition, AL_TRIGGERED, errstr);
               }
            }
         }
      }
   }
 
   /* do detached transition via mtransition tool */
   if (async_flag & TR_DETACH) {
      status = cm_transition_detach(transition, run_number, errstr, errstr_size, async_flag, debug_flag);
      return tr_finish(hDB, &s, transition, status, errstr);
   }
 
   mstrlcpy(errstr, "Unknown error", errstr_size);
 
   if (debug_flag == 0) {
      size = sizeof(i);
      db_get_value(hDB, 0, "/Experiment/Transition debug flag", &debug_flag, &size, TID_INT32, TRUE);
   }
 
   /* if no run number is given, get it from ODB and increment it */
   if (run_number == 0) {
      size = sizeof(run_number);
      status = db_get_value(hDB, 0, "Runinfo/Run number", &run_number, &size, TID_INT32, TRUE);
      assert(status == SUCCESS);
      if (transition == TR_START) {
         run_number++;
      }
      s.run_number = run_number;
 
      if (transition != TR_STARTABORT) {
         db_set_value(hDB, 0, "/System/Transition/run_number", &run_number, sizeof(INT), 1, TID_INT32);
      }
   }
 
   if (run_number <= 0) {
      cm_msg(MERROR, "cm_transition", "aborting on attempt to use invalid run number %d", run_number);
      abort();
   }
 
   /* Set new run number in ODB */
   if (transition == TR_START) {
      if (debug_flag == 1)
         printf("Setting run number %d in ODB\n", run_number);
      if (debug_flag == 2)
         cm_msg(MINFO, "cm_transition", "cm_transition: Setting run number %d in ODB", run_number);
 
      status = db_set_value(hDB, 0, "Runinfo/Run number", &run_number, sizeof(run_number), 1, TID_INT32);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_transition", "cannot set Runinfo/Run number in database, status %d", status);
         abort();
      }
   }
 
   if (deferred) {
      if (debug_flag == 1)
         printf("Clearing /Runinfo/Requested transition\n");
      if (debug_flag == 2)
         cm_msg(MINFO, "cm_transition", "cm_transition: Clearing /Runinfo/Requested transition");
 
      /* remove transition request */
      i = 0;
      db_set_value(hDB, 0, "/Runinfo/Requested transition", &i, sizeof(int), 1, TID_INT32);
   } else {
      status = db_find_key(hDB, 0, "System/Clients", &hRootKey);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_transition", "cannot find System/Clients entry in database");
         if (errstr)
            mstrlcpy(errstr, "Cannot find /System/Clients in ODB", errstr_size);
         return tr_finish(hDB, &s, transition, status, errstr);
      }
 
      /* check if deferred transition already in progress */
      size = sizeof(i);
      db_get_value(hDB, 0, "/Runinfo/Requested transition", &i, &size, TID_INT32, TRUE);
      if (i) {
         if (errstr) {
            mstrlcpy(errstr, "Deferred transition already in progress", errstr_size);
            mstrlcat(errstr, ", to cancel, set \"/Runinfo/Requested transition\" to zero", errstr_size);
         }
         return tr_finish(hDB, &s, transition, CM_TRANSITION_IN_PROGRESS, errstr);
      }
 
      std::string trname = cm_transition_name(transition);
 
      sprintf(tr_key_name, "Transition %s DEFERRED", trname.c_str());
 
      /* search database for clients with deferred transition request */
      for (i = 0, status = 0;; i++) {
         status = db_enum_key(hDB, hRootKey, i, &hSubkey);
         if (status == DB_NO_MORE_SUBKEYS)
            break;
 
         if (status == DB_SUCCESS) {
            size = sizeof(sequence_number);
            status = db_get_value(hDB, hSubkey, tr_key_name, &sequence_number, &size, TID_INT32, FALSE);
 
            /* if registered for deferred transition, set flag in ODB and return */
            if (status == DB_SUCCESS) {
               char str[256];
               size = NAME_LENGTH;
               db_get_value(hDB, hSubkey, "Name", str, &size, TID_STRING, TRUE);
 
               if (debug_flag == 1)
                  printf("---- Transition %s deferred by client \"%s\" ----\n", trname.c_str(), str);
               if (debug_flag == 2)
                  cm_msg(MINFO, "cm_transition", "cm_transition: ---- Transition %s deferred by client \"%s\" ----", trname.c_str(), str);
 
               if (debug_flag == 1)
                  printf("Setting /Runinfo/Requested transition\n");
               if (debug_flag == 2)
                  cm_msg(MINFO, "cm_transition", "cm_transition: Setting /Runinfo/Requested transition");
 
               /* /Runinfo/Requested transition is hot-linked by mfe.c and writing to it
                * will activate the deferred transition code in the frontend.
                * the transition itself will be run from the frontend via cm_transition(TR_DEFERRED) */
 
               db_set_value(hDB, 0, "/Runinfo/Requested transition", &transition, sizeof(int), 1, TID_INT32);
 
               db_set_value(hDB, 0, "/System/Transition/deferred", str, strlen(str) + 1, 1, TID_STRING);
 
               if (errstr)
                  sprintf(errstr, "Transition %s deferred by client \"%s\"", trname.c_str(), str);
 
               return tr_finish(hDB, &s, transition, CM_DEFERRED_TRANSITION, errstr);
            }
         }
      }
   }
 
   /* execute programs on start */
   if (transition == TR_START) {
      char str[256];
      str[0] = 0;
      size = sizeof(str);
      db_get_value(hDB, 0, "/Programs/Execute on start run", str, &size, TID_STRING, TRUE);
      if (str[0])
         ss_system(str);
 
      db_find_key(hDB, 0, "/Programs", &hRootKey);
      if (hRootKey) {
         for (i = 0;; i++) {
            BOOL program_info_auto_start = FALSE;
            status = db_enum_key(hDB, hRootKey, i, &hKey);
            if (status == DB_NO_MORE_SUBKEYS)
               break;
 
            db_get_key(hDB, hKey, &key);
 
            /* don't check "execute on xxx" */
            if (key.type != TID_KEY)
               continue;
 
            size = sizeof(program_info_auto_start);
            status = db_get_value(hDB, hKey, "Auto start", &program_info_auto_start, &size, TID_BOOL, TRUE);
            if (status != DB_SUCCESS) {
               cm_msg(MERROR, "cm_transition", "Cannot get program info auto start, status %d", status);
               continue;
            }
 
            if (program_info_auto_start) {
               char start_command[MAX_STRING_LENGTH];
               start_command[0] = 0;
 
               size = sizeof(start_command);
               status = db_get_value(hDB, hKey, "Start command", &start_command, &size, TID_STRING, TRUE);
               if (status != DB_SUCCESS) {
                  cm_msg(MERROR, "cm_transition", "Cannot get program info start command, status %d", status);
                  continue;
               }
 
               if (start_command[0]) {
                  cm_msg(MINFO, "cm_transition", "Auto Starting program \"%s\", command \"%s\"", key.name,
                         start_command);
                  ss_system(start_command);
               }
            }
         }
      }
   }
 
   /* execute programs on startabort */
   if (transition == TR_STARTABORT) {
      /* make sure odb entry is always created, otherwise we only see it after the first aborted run start, maybe never */
      std::string cmd;
      db_get_value_string(hDB, 0, "/Programs/Execute on start abort", 0, &cmd, TRUE, 256);
      
      if (!cmd.empty())
         ss_system(cmd.c_str());
   }
 
   /* set new start time in database */
   if (transition == TR_START) {
      /* ASCII format */
      std::string now = cm_asctime();
      now.reserve(32);
      db_set_value(hDB, 0, "Runinfo/Start Time", now.c_str(), 32, 1, TID_STRING);
 
      /* reset stop time */
      seconds = 0;
      db_set_value(hDB, 0, "Runinfo/Stop Time binary", &seconds, sizeof(seconds), 1, TID_UINT32);
 
      /* Seconds since 1.1.1970 */
      cm_time(&seconds);
      db_set_value(hDB, 0, "Runinfo/Start Time binary", &seconds, sizeof(seconds), 1, TID_UINT32);
   }
 
   size = sizeof(state);
   status = db_get_value(hDB, 0, "Runinfo/State", &state, &size, TID_INT32, TRUE);
 
   /* set stop time in database */
   if (transition == TR_STOP) {
      if (status != DB_SUCCESS)
         cm_msg(MERROR, "cm_transition", "cannot get Runinfo/State in database");
 
      if (state != STATE_STOPPED) {
         /* stop time binary */
         cm_time(&seconds);
         status = db_set_value(hDB, 0, "Runinfo/Stop Time binary", &seconds, sizeof(seconds), 1, TID_UINT32);
         if (status != DB_SUCCESS)
            cm_msg(MERROR, "cm_transition", "cannot set \"Runinfo/Stop Time binary\" in database");
 
         /* stop time ascii */
         std::string now = cm_asctime();
         now.reserve(32);
         status = db_set_value(hDB, 0, "Runinfo/Stop Time", now.c_str(), 32, 1, TID_STRING);
         if (status != DB_SUCCESS)
            cm_msg(MERROR, "cm_transition", "cannot set \"Runinfo/Stop Time\" in database");
      }
   }
 
   status = db_find_key(hDB, 0, "System/Clients", &hRootKey);
   if (status != DB_SUCCESS) {
      cm_msg(MERROR, "cm_transition", "cannot find System/Clients entry in database");
      if (errstr)
         mstrlcpy(errstr, "Cannot find /System/Clients in ODB", errstr_size);
      return tr_finish(hDB, &s, transition, status, errstr);
   }
 
   std::string trname = cm_transition_name(transition);
 
   /* check that all transition clients are alive */
   for (int i = 0;;) {
      status = db_enum_key(hDB, hRootKey, i, &hSubkey);
      if (status != DB_SUCCESS)
         break;
 
      status = cm_check_client(hDB, hSubkey);
 
      if (status == DB_SUCCESS) {
         /* this client is alive. Check next one! */
         i++;
         continue;
      }
 
      assert(status == CM_NO_CLIENT);
 
      /* start from scratch: removing odb entries as we iterate over them
       * does strange things to db_enum_key() */
      i = 0;
   }
 
   /* check for broken RPC connections */
   rpc_client_check();
 
   if (debug_flag == 1)
      printf("---- Transition %s started ----\n", trname.c_str());
   if (debug_flag == 2)
      cm_msg(MINFO, "cm_transition", "cm_transition: ---- Transition %s started ----", trname.c_str());
 
   sprintf(tr_key_name, "Transition %s", trname.c_str());
 
   /* search database for clients which registered for transition */
 
   for (int i = 0, status = 0;; i++) {
      KEY subkey;
      status = db_enum_key(hDB, hRootKey, i, &hSubkey);
      if (status == DB_NO_MORE_SUBKEYS)
         break;
 
      status = db_get_key(hDB, hSubkey, &subkey);
      assert(status == DB_SUCCESS);
 
      if (status == DB_SUCCESS) {
         status = db_find_key(hDB, hSubkey, tr_key_name, &hKeyTrans);
 
         if (status == DB_SUCCESS) {
 
            db_get_key(hDB, hKeyTrans, &key);
 
            for (int j = 0; j < key.num_values; j++) {
               size = sizeof(sequence_number);
               status = db_get_data_index(hDB, hKeyTrans, &sequence_number, &size, j, TID_INT32);
               assert(status == DB_SUCCESS);
 
               TrClient *c = new TrClient;
 
               c->init_time  = ss_millitime();
               c->transition = transition;
               c->run_number = run_number;
               c->async_flag = async_flag;
               c->debug_flag = debug_flag;
               c->sequence_number = sequence_number;
               c->status = 0;
               c->key_name = subkey.name;
 
               /* get client info */
               char client_name[NAME_LENGTH];
               size = sizeof(client_name);
               db_get_value(hDB, hSubkey, "Name", client_name, &size, TID_STRING, TRUE);
               c->client_name = client_name;
 
               char host_name[HOST_NAME_LENGTH];
               size = sizeof(host_name);
               db_get_value(hDB, hSubkey, "Host", host_name, &size, TID_STRING, TRUE);
               c->host_name = host_name;
 
               //printf("Found client [%s] name [%s] transition [%s], i=%d, j=%d\n", subkey.name, client_name, tr_key_name, i, j);
 
               if (hSubkey == hKeylocal && ((async_flag & TR_MTHREAD) == 0)) {
                  /* remember own client */
                  c->port = 0;
               } else {
                  size = sizeof(port);
                  db_get_value(hDB, hSubkey, "Server Port", &port, &size, TID_INT32, TRUE);
                  c->port = port;
               }
 
               /* check for duplicates */
 
               bool found = false;
               for (size_t k=0; k<s.clients.size(); k++) {
                  TrClient* cc = s.clients[k].get();
                  if (cc->client_name == c->client_name)
                     if (cc->host_name == c->host_name)
                        if (cc->port == c->port)
                           if (cc->sequence_number == c->sequence_number)
                              found = true;
               }
 
               if (!found) {
                  s.clients.push_back(std::unique_ptr<TrClient>(c));
                  c = NULL;
               } else {
                  cm_msg(MERROR, "cm_transition", "transition %s: client \"%s\" is registered with sequence number %d more than once", trname.c_str(), c->client_name.c_str(), c->sequence_number);
                  delete c;
                  c = NULL;
               }
            }
         }
      }
   }
 
   std::sort(s.clients.begin(), s.clients.end(), tr_compare);
 
   /* set predecessor for multi-threaded transitions */
   for (size_t idx = 0; idx < s.clients.size(); idx++) {
      if (s.clients[idx]->sequence_number == 0) {
         // sequence number 0 means "don't care"
      } else {
         /* find clients with smaller sequence number */
         if (idx > 0) {
            for (size_t i = idx - 1; ; i--) {
               if (s.clients[i]->sequence_number < s.clients[idx]->sequence_number) {
                  if (s.clients[i]->sequence_number > 0) {
                     s.clients[idx]->wait_for_index.push_back(i);
                  }
               }
               if (i==0)
                  break;
            }
         }
      }
   }
 
   for (size_t idx = 0; idx < s.clients.size(); idx++) {
      write_tr_client_to_odb(hDB, s.clients[idx].get());
   }
 
#if 0
   for (size_t idx = 0; idx < s.clients.size(); idx++) {
      printf("TrClient[%d]: ", int(idx));
      s.clients[idx]->Print();
      printf("\n");
   }
#endif
 
   /* contact ordered clients for transition -----------------------*/
   status = CM_SUCCESS;
   for (size_t idx = 0; idx < s.clients.size(); idx++) {
      if (debug_flag == 1)
         printf("\n==== Found client \"%s\" with sequence number %d\n",
                s.clients[idx]->client_name.c_str(), s.clients[idx]->sequence_number);
      if (debug_flag == 2)
         cm_msg(MINFO, "cm_transition",
                "cm_transition: ==== Found client \"%s\" with sequence number %d",
                s.clients[idx]->client_name.c_str(), s.clients[idx]->sequence_number);
 
      if (async_flag & TR_MTHREAD) {
         status = CM_SUCCESS;
         assert(s.clients[idx]->thread == NULL);
         s.clients[idx]->thread = new std::thread(cm_transition_call, &s, idx);
      } else {
         if (s.clients[idx]->port == 0) {
            /* if own client call transition callback directly */
            status = cm_transition_call_direct(s.clients[idx].get());
         } else {
            /* if other client call transition via RPC layer */
            status = cm_transition_call(&s, idx);
         }
 
         if (status == CM_SUCCESS && transition != TR_STOP)
            if (s.clients[idx]->status != SUCCESS) {
               cm_msg(MERROR, "cm_transition", "transition %s aborted: client \"%s\" returned status %d", trname.c_str(),
                      s.clients[idx]->client_name.c_str(), int(s.clients[idx]->status));
               break;
            }
      }
 
      if (status != CM_SUCCESS)
         break;
   }
 
   /* wait until all threads have finished */
   for (size_t idx = 0; idx < s.clients.size(); idx++) {
      if (s.clients[idx]->thread) {
         // join() will wait forever until thread finishes
         s.clients[idx]->thread->join();
         delete s.clients[idx]->thread;
         s.clients[idx]->thread = NULL;
      }
   }
 
   /* at this point, all per-client threads have stopped and it is safe to delete TrState and return */
 
   i = 0;
   size = sizeof(i);
   status = db_get_value(hDB, 0, "/Runinfo/Transition in progress", &i, &size, TID_INT32, FALSE);
 
   if (status == DB_SUCCESS && i == 0) {
      cm_msg(MERROR, "cm_transition", "transition %s aborted: \"/Runinfo/Transition in progress\" was cleared", trname.c_str());
 
      if (errstr != NULL)
         mstrlcpy(errstr, "Canceled", errstr_size);
 
      return tr_finish(hDB, &s, transition, CM_TRANSITION_CANCELED, "Canceled");
   }
 
   /* search for any error */
   for (size_t idx = 0; idx < s.clients.size(); idx++)
      if (s.clients[idx]->status != CM_SUCCESS) {
         status = s.clients[idx]->status;
         if (errstr)
            mstrlcpy(errstr, s.clients[idx]->errorstr.c_str(), errstr_size);
         s.errorstr = msprintf("Aborted by client \"%s\"", s.clients[idx]->client_name.c_str());
         break;
      }
 
   if (transition != TR_STOP && status != CM_SUCCESS) {
      /* indicate abort */
      i = 1;
      db_set_value(hDB, 0, "/Runinfo/Start abort", &i, sizeof(INT), 1, TID_INT32);
      i = 0;
      db_set_value(hDB, 0, "/Runinfo/Transition in progress", &i, sizeof(INT), 1, TID_INT32);
 
      return tr_finish(hDB, &s, transition, status, errstr);
   }
 
   if (debug_flag == 1)
      printf("\n---- Transition %s finished ----\n", trname.c_str());
   if (debug_flag == 2)
      cm_msg(MINFO, "cm_transition", "cm_transition: ---- Transition %s finished ----", trname.c_str());
 
   /* set new run state in database */
   if (transition == TR_START || transition == TR_RESUME)
      state = STATE_RUNNING;
 
   if (transition == TR_PAUSE)
      state = STATE_PAUSED;
 
   if (transition == TR_STOP)
      state = STATE_STOPPED;
 
   if (transition == TR_STARTABORT)
      state = STATE_STOPPED;
 
   size = sizeof(state);
   status = db_set_value(hDB, 0, "Runinfo/State", &state, size, 1, TID_INT32);
   if (status != DB_SUCCESS)
      cm_msg(MERROR, "cm_transition", "cannot set Runinfo/State in database, db_set_value() status %d", status);
 
   /* send notification message */
   if (transition == TR_START)
      cm_msg(MINFO, "cm_transition", "Run #%d started", run_number);
   if (transition == TR_STOP)
      cm_msg(MINFO, "cm_transition", "Run #%d stopped", run_number);
   if (transition == TR_PAUSE)
      cm_msg(MINFO, "cm_transition", "Run #%d paused", run_number);
   if (transition == TR_RESUME)
      cm_msg(MINFO, "cm_transition", "Run #%d resumed", run_number);
   if (transition == TR_STARTABORT)
      cm_msg(MINFO, "cm_transition", "Run #%d start aborted", run_number);
 
   /* lock/unlock ODB values if present */
   db_find_key(hDB, 0, "/Experiment/Lock when running", &hKey);
   if (hKey) {
      if (state == STATE_STOPPED)
         db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE | MODE_DELETE, TRUE);
      else
         db_set_mode(hDB, hKey, MODE_READ, TRUE);
   }
 
   /* flush online database */
   if (transition == TR_STOP)
      db_flush_database(hDB);
 
   /* execute/stop programs on stop */
   if (transition == TR_STOP) {
      std::string cmd;
      db_get_value_string(hDB, 0, "/Programs/Execute on stop run", 0, &cmd, TRUE, 256);
      if (!cmd.empty())
         ss_system(cmd.c_str());
 
      db_find_key(hDB, 0, "/Programs", &hRootKey);
      if (hRootKey) {
         for (i = 0;; i++) {
            BOOL program_info_auto_stop = FALSE;
            status = db_enum_key(hDB, hRootKey, i, &hKey);
            if (status == DB_NO_MORE_SUBKEYS)
               break;
 
            db_get_key(hDB, hKey, &key);
 
            /* don't check "execute on xxx" */
            if (key.type != TID_KEY)
               continue;
 
            size = sizeof(program_info_auto_stop);
            status = db_get_value(hDB, hKey, "Auto stop", &program_info_auto_stop, &size, TID_BOOL, TRUE);
            if (status != DB_SUCCESS) {
               cm_msg(MERROR, "cm_transition", "Cannot get program info auto stop, status %d", status);
               continue;
            }
 
            if (program_info_auto_stop) {
               cm_msg(MINFO, "cm_transition", "Auto Stopping program \"%s\"", key.name);
               cm_shutdown(key.name, FALSE);
            }
         }
      }
   }
 
 
   /* indicate success */
   i = 0;
   db_set_value(hDB, 0, "/Runinfo/Transition in progress", &i, sizeof(INT), 1, TID_INT32);
 
   if (errstr != NULL)
      mstrlcpy(errstr, "Success", errstr_size);
 
   return tr_finish(hDB, &s, transition, CM_SUCCESS, "Success");
}
 
/*------------------------------------------------------------------*/
 
/* wrapper around cm_transition2() to send a TR_STARTABORT in case of failure */
static INT cm_transition1(INT transition, INT run_number, char *errstr, INT errstr_size, INT async_flag, INT debug_flag) {
   int status;
 
   status = cm_transition2(transition, run_number, errstr, errstr_size, async_flag, debug_flag);
 
   if (transition == TR_START && status != CM_SUCCESS) {
      cm_msg(MERROR, "cm_transition", "Could not start a run: cm_transition() status %d, message \'%s\'", status,
             errstr);
      cm_transition2(TR_STARTABORT, run_number, NULL, 0, async_flag, debug_flag);
   }
 
   return status;
}
 
/*------------------------------------------------------------------*/
 
static INT tr_main_thread(void *param) {
   INT status;
   TR_PARAM *trp;
 
   trp = (TR_PARAM *) param;
   status = cm_transition1(trp->transition, trp->run_number, trp->errstr, trp->errstr_size, trp->async_flag, trp->debug_flag);
 
   trp->status = status;
   trp->finished = TRUE;
 
   return 0;
}
 
INT cm_transition_cleanup()
{
   if (_trp.thread && !_trp.finished) {
      //printf("main transition thread did not finish yet!\n");
      return CM_TRANSITION_IN_PROGRESS;
   }
 
   std::thread* t = _trp.thread.exchange(NULL);
 
   if (t) {
      t->join();
      delete t;
      t = NULL;
   }
 
   return CM_SUCCESS;
}
 
/* wrapper around cm_transition1() for detached multi-threaded transitions */
INT cm_transition(INT transition, INT run_number, char *errstr, INT errstr_size, INT async_flag, INT debug_flag) {
   int mflag = async_flag & TR_MTHREAD;
   int sflag = async_flag & TR_SYNC;
 
   int status = cm_transition_cleanup();
 
   if (status != CM_SUCCESS) {
      cm_msg(MERROR, "cm_transition", "previous transition did not finish yet");
      return CM_TRANSITION_IN_PROGRESS;
   }
 
   /* get key of local client */
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   bool deferred = (transition & TR_DEFERRED) > 0;
   INT trans_raw = (transition & ~TR_DEFERRED);
 
   /* check for valid transition */
   if (trans_raw != TR_START && trans_raw != TR_STOP && trans_raw != TR_PAUSE && trans_raw != TR_RESUME && trans_raw != TR_STARTABORT) {
      cm_msg(MERROR, "cm_transition", "Invalid transition request \"%d\"", transition);
      if (errstr) {
         mstrlcpy(errstr, "Invalid transition request", errstr_size);
      }
      return CM_INVALID_TRANSITION;
   }
 
   /* check if transition in progress */
   if (!deferred) {
      int i = 0;
      int size = sizeof(i);
      db_get_value(hDB, 0, "/Runinfo/Transition in progress", &i, &size, TID_INT32, TRUE);
      if (i == 1) {
         if (errstr) {
            sprintf(errstr, "Start/Stop transition %d already in progress, please try again later\n", i);
            mstrlcat(errstr, "or set \"/Runinfo/Transition in progress\" manually to zero.\n", errstr_size);
         }
         cm_msg(MERROR, "cm_transition", "another transition is already in progress");
         return CM_TRANSITION_IN_PROGRESS;
      }
   }
 
   if (mflag) {
      _trp.transition = transition;
      _trp.run_number = run_number;
      if (sflag) {
         /* in MTHREAD|SYNC mode, we wait until the main thread finishes and it is safe for it to write into errstr */
         _trp.errstr = errstr;
         _trp.errstr_size = errstr_size;
      } else {
         /* in normal MTHREAD mode, we return right away and
          * if errstr is a local variable in the caller and they return too,
          * errstr becomes a stale reference and writing into it will corrupt the stack
          * in the mlogger, errstr is a local variable in "start_the_run", "stop_the_run"
          * and we definitely corrupt mlogger memory with out this: */
         _trp.errstr = NULL;
         _trp.errstr_size = 0;
      }
      _trp.async_flag = async_flag;
      _trp.debug_flag = debug_flag;
      _trp.status = 0;
      _trp.finished = FALSE;
 
      if (errstr)
         *errstr = 0; // null error string
 
      //ss_thread_create(tr_main_thread, &_trp);
 
      std::thread* t = _trp.thread.exchange(new std::thread(tr_main_thread, &_trp));
 
      assert(t==NULL); // previous thread should have been reaped by cm_transition_cleanup()
 
      if (sflag) {
 
         /* wait until main thread has finished */
         do {
            ss_sleep(10);
         } while (!_trp.finished);
 
         std::thread* t = _trp.thread.exchange(NULL);
 
         if (t) {
            t->join();
            delete t;
            t = NULL;
         }
 
         return _trp.status;
      }
   } else
      return cm_transition1(transition, run_number, errstr, errstr_size, async_flag, debug_flag);
 
   return CM_SUCCESS;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT cm_dispatch_ipc(const char *message, int message_size, int client_socket)
/********************************************************************\
 
  Routine: cm_dispatch_ipc
 
  Purpose: Called from ss_suspend if an IPC message arrives
 
  Input:
    INT   msg               IPC message we got, MSG_ODB/MSG_BM
    INT   p1, p2            Optional parameters
    int   s                 Optional server socket
 
  Output:
    none
 
  Function value:
    CM_SUCCESS              Successful completion
 
\********************************************************************/
{
   if (message[0] == 'O') {
      HNDLE hDB, hKey, hKeyRoot;
      INT index;
      index = 0;
      sscanf(message + 2, "%d %d %d %d", &hDB, &hKeyRoot, &hKey, &index);
      if (client_socket) {
         return db_update_record_mserver(hDB, hKeyRoot, hKey, index, client_socket);
      } else {
         return db_update_record_local(hDB, hKeyRoot, hKey, index);
      }
   }
 
   /* message == "B" means "resume event sender" */
   if (message[0] == 'B' && message[2] != ' ') {
      char str[NAME_LENGTH];
 
      //printf("cm_dispatch_ipc: message [%s], s=%d\n", message, s);
 
      mstrlcpy(str, message + 2, sizeof(str));
      if (strchr(str, ' '))
         *strchr(str, ' ') = 0;
 
      if (client_socket)
         return bm_notify_client(str, client_socket);
      else
         return bm_push_event(str);
   }
 
   //printf("cm_dispatch_ipc: message [%s] ignored\n", message);
 
   return CM_SUCCESS;
}
 
/********************************************************************/
static BOOL _ctrlc_pressed = FALSE;
 
void cm_ctrlc_handler(int sig) {
   if (_ctrlc_pressed) {
      printf("Received 2nd Ctrl-C, hard abort\n");
      exit(0);
   }
   printf("Received Ctrl-C, aborting...\n");
   _ctrlc_pressed = TRUE;
 
   ss_ctrlc_handler(cm_ctrlc_handler);
}
 
BOOL cm_is_ctrlc_pressed() {
   return _ctrlc_pressed;
}
 
void cm_ack_ctrlc_pressed() {
   _ctrlc_pressed = FALSE;
}
 
/********************************************************************/
int cm_exec_script(const char *odb_path_to_script)
/********************************************************************\
 
  Routine: cm_exec_script
 
  Purpose: Execute script from /Script tree
 
  exec_script is enabled by the tree /Script
  The /Script struct is composed of list of keys
  from which the name of the key is the button name
  and the sub-structure is a record as follow:
 
  /Script/<button_name> = <script command> (TID_STRING)
 
  The "Script command", containing possible arguements,
  is directly executed.
 
  /Script/<button_name>/<script command>
                        <soft link1>|<arg1>
                        <soft link2>|<arg2>
                           ...
 
  The arguments for the script are derived from the
  subtree below <button_name>, where <button_name> must be
  TID_KEY. The subtree may then contain arguments or links
  to other values in the ODB, like run number etc.
 
\********************************************************************/
{
   HNDLE hDB, hkey;
   KEY key;
   int status;
 
   status = cm_get_experiment_database(&hDB, NULL);
   if (status != DB_SUCCESS)
      return status;
 
   status = db_find_key(hDB, 0, odb_path_to_script, &hkey);
   if (status != DB_SUCCESS)
      return status;
 
   status = db_get_key(hDB, hkey, &key);
   if (status != DB_SUCCESS)
      return status;
 
   std::string command;
 
   if (key.type == TID_STRING) {
      int status = db_get_value_string(hDB, 0, odb_path_to_script, 0, &command, FALSE);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_exec_script", "Script ODB \"%s\" of type TID_STRING, db_get_value_string() error %d",
                odb_path_to_script, status);
         return status;
      }
   } else if (key.type == TID_KEY) {
      for (int i = 0;; i++) {
         HNDLE hsubkey;
         KEY subkey;
         db_enum_key(hDB, hkey, i, &hsubkey);
         if (!hsubkey)
            break;
         db_get_key(hDB, hsubkey, &subkey);
 
         if (i > 0)
            command += " ";
 
         if (subkey.type == TID_KEY) {
            cm_msg(MERROR, "cm_exec_script", "Script ODB \"%s/%s\" should not be TID_KEY", odb_path_to_script,
                   subkey.name);
            return DB_TYPE_MISMATCH;
         } else {
            int size = subkey.item_size;
            char *buf = (char *) malloc(size);
            assert(buf != NULL);
            int status = db_get_data(hDB, hsubkey, buf, &size, subkey.type);
            if (status != DB_SUCCESS) {
               cm_msg(MERROR, "cm_exec_script", "Script ODB \"%s/%s\" of type %d, db_get_data() error %d",
                      odb_path_to_script, subkey.name, subkey.type, status);
               free(buf);
               return status;
            }
            if (subkey.type == TID_STRING) {
               command += buf;
            } else {
               command += db_sprintf(buf, subkey.item_size, 0, subkey.type);
            }
            free(buf);
         }
      }
   } else {
      cm_msg(MERROR, "cm_exec_script", "Script ODB \"%s\" has invalid type %d, should be TID_STRING or TID_KEY",
             odb_path_to_script, key.type);
      return DB_TYPE_MISMATCH;
   }
 
   // printf("exec_script: %s\n", command.c_str());
 
   if (command.length() > 0) {
      cm_msg(MINFO, "cm_exec_script", "Executing script \"%s\" from ODB \"%s\"", command.c_str(), odb_path_to_script);
      ss_system(command.c_str());
   }
 
   return SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
static void bm_cleanup(const char *who, DWORD actual_time, BOOL wrong_interval);
 
/********************************************************************/
INT cm_periodic_tasks() {
   static DWORD alarm_last_checked_sec = 0;
   DWORD now_sec = ss_time();
 
   DWORD now_millitime = ss_millitime();
   static DWORD last_millitime = 0;
   DWORD tdiff_millitime = now_millitime - last_millitime;
   const DWORD kPeriod = 1000;
   if (last_millitime == 0) {
      last_millitime = now_millitime;
      tdiff_millitime = kPeriod; // make sure first time we come here we do something.
   }
 
   //printf("cm_periodic_tasks! tdiff_millitime %d\n", (int)tdiff_millitime);
 
   //if (now_millitime < last_millitime) {
   //   printf("millitime wraparound 0x%08x -> 0x%08x\n", last_millitime, now_millitime);
   //}
 
   /* check alarms once every 10 seconds */
   if (now_sec - alarm_last_checked_sec > 10) {
      al_check();
      alarm_last_checked_sec = now_sec;
   }
 
   /* run periodic checks previously done by cm_watchdog */
 
   if (tdiff_millitime >= kPeriod) {
      BOOL wrong_interval = FALSE;
      if (tdiff_millitime > 60000)
         wrong_interval = TRUE;
 
      //printf("millitime %u, diff %u, wrong_interval %d\n", now_millitime, tdiff_millitime, wrong_interval);
 
      bm_cleanup("cm_periodic_tasks", now_millitime, wrong_interval);
      db_cleanup("cm_periodic_tasks", now_millitime, wrong_interval);
 
      bm_write_statistics_to_odb();
 
      last_millitime = now_millitime;
   }
 
   /* reap transition thread */
 
   cm_transition_cleanup();
 
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_yield(INT millisec) {
   INT status;
   INT bMore;
   //static DWORD last_yield = 0;
   //static DWORD last_yield_time = 0;
   //DWORD start_yield = ss_millitime();
 
   /* check for ctrl-c */
   if (_ctrlc_pressed)
      return RPC_SHUTDOWN;
 
   /* flush the cm_msg buffer */
   cm_msg_flush_buffer();
 
   if (!rpc_is_remote()) {
      /* flush the ODB to its binary file */
      /* for remote clients, ODB is flushed by the mserver */
      HNDLE hDB;
      cm_get_experiment_database(&hDB, NULL);
      db_flush_database(hDB);
   }
 
   /* check for available events */
   if (rpc_is_remote()) {
      //printf("cm_yield() calling bm_poll_event()\n");
      status = bm_poll_event();
 
      if (status == SS_ABORT) {
         return status;
      }
 
      if (status == BM_SUCCESS) {
         /* one or more events received by bm_poll_event() */
         status = ss_suspend(0, 0);
      } else {
         status = ss_suspend(millisec, 0);
      }
 
      return status;
   }
 
   status = cm_periodic_tasks();
 
   if (status != CM_SUCCESS)
      return status;
 
   //DWORD start_check = ss_millitime();
 
   bMore = bm_check_buffers();
 
   //DWORD end_check = ss_millitime();
   //printf("cm_yield: timeout %4d, yield period %4d, last yield time %4d, bm_check_buffers() elapsed %4d, returned %d\n", millisec, start_yield - last_yield, last_yield_time, end_check - start_check, bMore);
   //fflush(stdout);
 
   if (bMore == BM_CORRUPTED) {
      status = SS_ABORT;
   } else if (bMore) {
      /* if events available, quickly check other IPC channels */
      status = ss_suspend(0, 0);
   } else {
      status = ss_suspend(millisec, 0);
   }
 
   /* flush the cm_msg buffer */
   cm_msg_flush_buffer();
 
   //DWORD end_yield = ss_millitime();
   //last_yield_time = end_yield - start_yield;
   //last_yield = start_yield;
 
   return status;
}
 
/********************************************************************/
INT cm_execute(const char *command, char *result, INT bufsize) {
   char str[256];
   INT n;
   int fh;
   int status = 0;
   static int check_cm_execute = 1;
   static int enable_cm_execute = 0;
 
   if (rpc_is_remote())
      return rpc_call(RPC_CM_EXECUTE, command, result, bufsize);
 
   if (check_cm_execute) {
      int status;
      int size;
      HNDLE hDB;
      check_cm_execute = 0;
 
      status = cm_get_experiment_database(&hDB, NULL);
      assert(status == DB_SUCCESS);
 
      size = sizeof(enable_cm_execute);
      status = db_get_value(hDB, 0, "/Experiment/Enable cm_execute", &enable_cm_execute, &size, TID_BOOL, TRUE);
      assert(status == DB_SUCCESS);
 
      //printf("enable_cm_execute %d\n", enable_cm_execute);
   }
 
   if (!enable_cm_execute) {
      char buf[32];
      mstrlcpy(buf, command, sizeof(buf));
      cm_msg(MERROR, "cm_execute", "cm_execute(%s...) is disabled by ODB \"/Experiment/Enable cm_execute\"", buf);
      return CM_WRONG_PASSWORD;
   }
 
   if (bufsize > 0) {
      strcpy(str, command);
      sprintf(str, "%s > %d.tmp", command, ss_getpid());
 
      status = system(str);
 
      sprintf(str, "%d.tmp", ss_getpid());
      fh = open(str, O_RDONLY, 0644);
      result[0] = 0;
      if (fh) {
         n = read(fh, result, bufsize - 1);
         result[MAX(0, n)] = 0;
         close(fh);
      }
      remove(str);
   } else {
      status = system(command);
   }
 
   if (status < 0) {
      cm_msg(MERROR, "cm_execute", "cm_execute(%s) error %d", command, status);
      return CM_SET_ERROR;
   }
 
   return CM_SUCCESS;
}
 
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT cm_register_function(INT id, INT(*func)(INT, void **))
/********************************************************************\
 
  Routine: cm_register_function
 
  Purpose: Call rpc_register_function and publish the registered
           function under system/clients/<pid>/RPC
 
  Input:
    INT      id             RPC ID
    INT      *func          New dispatch function
 
  Output:
   <implicit: func gets copied to rpc_list>
 
  Function value:
   CM_SUCCESS               Successful completion
   RPC_INVALID_ID           RPC ID not found
 
\********************************************************************/
{
   HNDLE hDB, hKey;
   INT status;
   char str[80];
 
   status = rpc_register_function(id, func);
   if (status != RPC_SUCCESS)
      return status;
 
   cm_get_experiment_database(&hDB, &hKey);
 
   /* create new key for this id */
   status = 1;
   sprintf(str, "RPC/%d", id);
 
   db_set_mode(hDB, hKey, MODE_READ | MODE_WRITE, TRUE);
   status = db_set_value(hDB, hKey, str, &status, sizeof(BOOL), 1, TID_BOOL);
   db_set_mode(hDB, hKey, MODE_READ, TRUE);
 
   if (status != DB_SUCCESS)
      return status;
 
   return CM_SUCCESS;
}
 
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
//
// Return "/"-terminated file path for given history channel
//
 
std::string cm_get_history_path(const char* history_channel)
{
   int status;
   HNDLE hDB;
   std::string path;
 
   cm_get_experiment_database(&hDB, NULL);
 
   if (history_channel && (strlen(history_channel) > 0)) {
      std::string p;
      p += "/Logger/History/";
      p += history_channel;
      p += "/History dir";
 
      // NB: be careful to avoid creating odb entries under /logger
      // for whatever values of "history_channel" we get called with!
      status = db_get_value_string(hDB, 0, p.c_str(), 0, &path, FALSE);
      if (status == DB_SUCCESS && path.length() > 0) {
         // if not absolute path, prepend with experiment directory
         if (path[0] != DIR_SEPARATOR)
            path = cm_get_path() + path;
         // append directory separator
         if (path.back() != DIR_SEPARATOR)
            path += DIR_SEPARATOR_STR;
         //printf("for [%s] returning [%s] from [%s]\n", history_channel, path.c_str(), p.c_str());
         return path;
      }
   }
 
   status = db_get_value_string(hDB, 0, "/Logger/History dir", 0, &path, TRUE);
   if (status == DB_SUCCESS && path.length() > 0) {
      // if not absolute path, prepend with experiment directory
      if (path[0] != DIR_SEPARATOR)
         path = cm_get_path() + path;
      // append directory separator
      if (path.back() != DIR_SEPARATOR)
         path += DIR_SEPARATOR_STR;
      //printf("for [%s] returning /Logger/History dir [%s]\n", history_channel, path.c_str());
      return path;
   }
 
   status = db_get_value_string(hDB, 0, "/Logger/Data dir", 0, &path, FALSE);
   if (status == DB_SUCCESS && path.length() > 0) {
      // if not absolute path, prepend with experiment directory
      if (path[0] != DIR_SEPARATOR)
         path = cm_get_path() + path;
      // append directory separator
      if (path.back() != DIR_SEPARATOR)
         path += DIR_SEPARATOR_STR;
      //printf("for [%s] returning /Logger/Data dir [%s]\n", history_channel, path.c_str());
      return path;
   }
 
   //printf("for [%s] returning experiment dir [%s]\n", history_channel, cm_get_path().c_str());
   return cm_get_path();
}
 
 
/********************************************************************\
*                                                                    *
*                 bm_xxx  -  Buffer Manager Functions                *
*                                                                    *
\********************************************************************/
 
static DWORD _bm_max_event_size = 0;
 
#ifdef LOCAL_ROUTINES
 
// see locking code in xbm_lock_buffer()
static int _bm_lock_timeout = 5 * 60 * 1000;
static double _bm_mutex_timeout_sec = _bm_lock_timeout/1000 + 15.000;
 
static int bm_validate_client_index_locked(bm_lock_buffer_guard& pbuf_guard)
{
   const BUFFER *pbuf = pbuf_guard.get_pbuf();
 
   bool badindex  = false;
   bool badclient = false;
 
   int idx = pbuf->client_index;
 
   if (idx < 0) {
      badindex = true;
   } else if (idx > pbuf->buffer_header->max_client_index) {
      badindex = true;
   } else {
      BUFFER_CLIENT *pclient = &pbuf->buffer_header->client[idx];
      if (pclient->name[0] == 0)
         badclient = true;
      else if (pclient->pid != ss_getpid())
         badclient = true;
 
      //if (strcmp(pclient->name,"mdump")==0) {
      //   for (int i=0; i<15; i++) {
      //      printf("sleep %d\n", i);
      //      ::sleep(1);
      //   }
      //}
   }
 
#if 0
   if (badindex) {
      printf("bm_validate_client_index: pbuf=%p, buf_name \"%s\", client_index=%d, max_client_index=%d, badindex %d, pid=%d\n",
             pbuf, pbuf->buffer_header->name, pbuf->client_index, pbuf->buffer_header->max_client_index,
             badindex, ss_getpid());
   } else if (badclient) {
      printf("bm_validate_client_index: pbuf=%p, buf_name \"%s\", client_index=%d, max_client_index=%d, client_name=\'%s\', client_pid=%d, pid=%d, badclient %d\n",
             pbuf, pbuf->buffer_header->name, pbuf->client_index, pbuf->buffer_header->max_client_index,
             pbuf->buffer_header->client[idx].name, pbuf->buffer_header->client[idx].pid,
             ss_getpid(), badclient);
   } else {
      printf("bm_validate_client_index: pbuf=%p, buf_name \"%s\", client_index=%d, max_client_index=%d, client_name=\'%s\', client_pid=%d, pid=%d, goodclient\n",
             pbuf, pbuf->buffer_header->name, pbuf->client_index, pbuf->buffer_header->max_client_index,
             pbuf->buffer_header->client[idx].name, pbuf->buffer_header->client[idx].pid,
             ss_getpid());
   }
#endif
 
   if (badindex || badclient) {
      static int prevent_recursion = 1;
 
      if (prevent_recursion) {
         prevent_recursion = 0;
 
         if (badindex) {
            cm_msg(MERROR, "bm_validate_client_index", "My client index %d in buffer \'%s\' is invalid, max_client_index %d, my pid %d", idx, pbuf->buffer_header->name, pbuf->buffer_header->max_client_index, ss_getpid());
         } else {
            cm_msg(MERROR, "bm_validate_client_index", "My client index %d in buffer \'%s\' is invalid: client name \'%s\', pid %d should be my pid %d", idx, pbuf->buffer_header->name, pbuf->buffer_header->client[idx].name, pbuf->buffer_header->client[idx].pid, ss_getpid());
         }
 
         cm_msg(MERROR, "bm_validate_client_index", "Maybe this client was removed by a timeout. See midas.log. Cannot continue, aborting...");
      }
 
      if (badindex) {
         fprintf(stderr, "bm_validate_client_index: My client index %d in buffer \'%s\' is invalid, max_client_index %d, my pid %d\n", idx, pbuf->buffer_header->name, pbuf->buffer_header->max_client_index, ss_getpid());
      } else {
         fprintf(stderr, "bm_validate_client_index: My client index %d in buffer \'%s\' is invalid: client name \'%s\', pid %d should be my pid %d\n", idx, pbuf->buffer_header->name, pbuf->buffer_header->client[idx].name, pbuf->buffer_header->client[idx].pid, ss_getpid());
      }
      
      fprintf(stderr, "bm_validate_client_index: Maybe this client was removed by a timeout. See midas.log. Cannot continue, aborting...\n");
 
      pbuf_guard.unlock();
 
      abort();
   }
 
   return idx;
}
 
static BUFFER_CLIENT *bm_get_my_client_locked(bm_lock_buffer_guard& pbuf_guard) {
   int my_client_index = bm_validate_client_index_locked(pbuf_guard);
   return pbuf_guard.get_pbuf()->buffer_header->client + my_client_index;
}
 
#endif // LOCAL_ROUTINES
 
/********************************************************************/
INT bm_match_event(short int event_id, short int trigger_mask, const EVENT_HEADER *pevent) {
   // NB: cast everything to unsigned 16 bit to avoid bitwise comparison failure
   // because of mismatch in sign-extension between signed 16-bit event_id and
   // unsigned 16-bit constants. K.O.
 
   if (((uint16_t(pevent->event_id) & uint16_t(0xF000)) == uint16_t(EVENTID_FRAG1)) || ((uint16_t(pevent->event_id) & uint16_t(0xF000)) == uint16_t(EVENTID_FRAG)))
      /* fragmented event */
      return (((uint16_t(event_id) == uint16_t(EVENTID_ALL)) || (uint16_t(event_id) == (uint16_t(pevent->event_id) & uint16_t(0x0FFF))))
              && ((uint16_t(trigger_mask) == uint16_t(TRIGGER_ALL)) || ((uint16_t(trigger_mask) & uint16_t(pevent->trigger_mask)))));
 
   return (((uint16_t(event_id) == uint16_t(EVENTID_ALL)) || (uint16_t(event_id) == uint16_t(pevent->event_id)))
           && ((uint16_t(trigger_mask) == uint16_t(TRIGGER_ALL)) || ((uint16_t(trigger_mask) & uint16_t(pevent->trigger_mask)))));
}
 
#ifdef LOCAL_ROUTINES
 
/********************************************************************/
void bm_remove_client_locked(BUFFER_HEADER *pheader, int j) {
   int k, nc;
   BUFFER_CLIENT *pbctmp;
 
   /* clear entry from client structure in buffer header */
   memset(&(pheader->client[j]), 0, sizeof(BUFFER_CLIENT));
 
   /* calculate new max_client_index entry */
   for (k = MAX_CLIENTS - 1; k >= 0; k--)
      if (pheader->client[k].pid != 0)
         break;
   pheader->max_client_index = k + 1;
 
   /* count new number of clients */
   for (k = MAX_CLIENTS - 1, nc = 0; k >= 0; k--)
      if (pheader->client[k].pid != 0)
         nc++;
   pheader->num_clients = nc;
 
   /* check if anyone is waiting and wake him up */
   pbctmp = pheader->client;
 
   for (k = 0; k < pheader->max_client_index; k++, pbctmp++)
      if (pbctmp->pid && (pbctmp->write_wait || pbctmp->read_wait))
         ss_resume(pbctmp->port, "B  ");
}
 
/********************************************************************/
static void bm_cleanup_buffer_locked(BUFFER* pbuf, const char *who, DWORD actual_time) {
   BUFFER_HEADER *pheader;
   BUFFER_CLIENT *pbclient;
   int j;
 
   pheader = pbuf->buffer_header;
   pbclient = pheader->client;
 
   /* now check other clients */
   for (j = 0; j < pheader->max_client_index; j++, pbclient++) {
      if (pbclient->pid) {
         if (!ss_pid_exists(pbclient->pid)) {
            cm_msg(MINFO, "bm_cleanup",
                   "Client \'%s\' on buffer \'%s\' removed by %s because process pid %d does not exist", pbclient->name,
                   pheader->name, who, pbclient->pid);
 
            bm_remove_client_locked(pheader, j);
            continue;
         }
      }
 
      /* If client process has no activity, clear its buffer entry. */
      if (pbclient->pid && pbclient->watchdog_timeout > 0) {
         DWORD tdiff = actual_time - pbclient->last_activity;
#if 0
         printf("buffer [%s] client [%-32s] times 0x%08x 0x%08x, diff 0x%08x %5d, timeout %d\n",
                pheader->name,
                pbclient->name,
                pbclient->last_activity,
                actual_time,
                tdiff,
                tdiff,
                pbclient->watchdog_timeout);
#endif
         if (actual_time > pbclient->last_activity &&
             tdiff > pbclient->watchdog_timeout) {
 
            cm_msg(MINFO, "bm_cleanup", "Client \'%s\' on buffer \'%s\' removed by %s (idle %1.1lfs, timeout %1.0lfs)",
                   pbclient->name, pheader->name, who,
                   tdiff / 1000.0,
                   pbclient->watchdog_timeout / 1000.0);
 
            bm_remove_client_locked(pheader, j);
         }
      }
   }
}
 
static void bm_update_last_activity(DWORD millitime) {
   int pid = ss_getpid();
 
   std::vector<BUFFER*> mybuffers;
 
   gBuffersMutex.lock();
   mybuffers = gBuffers;
   gBuffersMutex.unlock();
 
   for (BUFFER* pbuf : mybuffers) {
      if (!pbuf)
         continue;
      if (pbuf->attached) {
 
         bm_lock_buffer_guard pbuf_guard(pbuf);
 
         if (!pbuf_guard.is_locked())
            continue;
 
         BUFFER_HEADER *pheader = pbuf->buffer_header;
         for (int j = 0; j < pheader->max_client_index; j++) {
            BUFFER_CLIENT *pclient = pheader->client + j;
            if (pclient->pid == pid) {
               pclient->last_activity = millitime;
            }
         }
      }
   }
}
 
#endif // LOCAL_ROUTINES
 
static void bm_cleanup(const char *who, DWORD actual_time, BOOL wrong_interval)
{
#ifdef LOCAL_ROUTINES
 
   //printf("bm_cleanup: called by %s, actual_time %d, wrong_interval %d\n", who, actual_time, wrong_interval);
 
   std::vector<BUFFER*> mybuffers;
 
   gBuffersMutex.lock();
   mybuffers = gBuffers;
   gBuffersMutex.unlock();
 
   /* check buffers */
   for (BUFFER* pbuf : mybuffers) {
      if (!pbuf)
         continue;
      if (pbuf->attached) {
         /* update the last_activity entry to show that we are alive */
 
         bm_lock_buffer_guard pbuf_guard(pbuf);
         
         if (!pbuf_guard.is_locked())
            continue;
 
         BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
         pclient->last_activity = actual_time;
 
         /* don't check other clients if interval is strange */
         if (!wrong_interval)
            bm_cleanup_buffer_locked(pbuf, who, actual_time);
      }
   }
#endif // LOCAL_ROUTINES
}
 
#ifdef LOCAL_ROUTINES
 
static BOOL bm_validate_rp(const char *who, const BUFFER_HEADER *pheader, int rp) {
   if (rp < 0 || rp > pheader->size) {
      cm_msg(MERROR, "bm_validate_rp",
             "error: buffer \"%s\" is corrupted: rp %d is invalid. buffer read_pointer %d, write_pointer %d, size %d, called from %s",
             pheader->name,
             rp,
             pheader->read_pointer,
             pheader->write_pointer,
             pheader->size,
             who);
      return FALSE;
   }
 
   if ((rp + (int) sizeof(EVENT_HEADER)) > pheader->size) {
      // note ">" here, has to match bm_incr_rp() and bm_write_to_buffer()
      cm_msg(MERROR, "bm_validate_rp",
             "error: buffer \"%s\" is corrupted: rp %d plus event header point beyond the end of buffer by %d bytes. buffer read_pointer %d, write_pointer %d, size %d, called from %s",
             pheader->name,
             rp,
             (int) (rp + sizeof(EVENT_HEADER) - pheader->size),
             pheader->read_pointer,
             pheader->write_pointer,
             pheader->size,
             who);
      return FALSE;
   }
 
   return TRUE;
}
 
#if 0
static FILE* gRpLog = NULL;
#endif
 
static int bm_incr_rp_no_check(const BUFFER_HEADER *pheader, int rp, int total_size)
{
#if 0
   if (gRpLog == NULL) {
      gRpLog = fopen("rp.log", "a");
   }
   if (gRpLog && (total_size < 16)) {
      const char *pdata = (const char *) (pheader + 1);
      const DWORD *pevent = (const DWORD*) (pdata + rp);
      fprintf(gRpLog, "%s: rp %d, total_size %d, at rp 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", pheader->name, rp, total_size,
              pevent[0], pevent[1], pevent[2], pevent[3], pevent[4], pevent[5]);
   }
#endif
 
   // these checks are already done before we come here.
   // but we check again as last-ressort protection. K.O.
   assert(total_size > 0);
   assert(total_size >= (int)sizeof(EVENT_HEADER));
 
   rp += total_size;
   if (rp >= pheader->size) {
      rp -= pheader->size;
   } else if ((rp + (int) sizeof(EVENT_HEADER)) > pheader->size) {
      // note: ">" here to match bm_write_to_buffer_locked() and bm_validate_rp().
      // if at the end of the buffer, the remaining free space is exactly
      // equal to the size of an event header, the event header
      // is written there, the pointer is wrapped and the event data
      // is written to the beginning of the buffer.
      rp = 0;
   }
   return rp;
}
 
static int bm_next_rp(const char *who, const BUFFER_HEADER *pheader, const char *pdata, int rp) {
   const EVENT_HEADER *pevent = (const EVENT_HEADER *) (pdata + rp);
   int event_size = pevent->data_size + sizeof(EVENT_HEADER);
   int total_size = ALIGN8(event_size);
 
   if (pevent->data_size <= 0 || total_size <= 0 || total_size > pheader->size) {
      cm_msg(MERROR, "bm_next_rp",
             "error: buffer \"%s\" is corrupted: rp %d points to an invalid event: data_size %d, event size %d, total_size %d, buffer read_pointer %d, write_pointer %d, size %d, called from %s",
             pheader->name,
             rp,
             pevent->data_size,
             event_size,
             total_size,
             pheader->read_pointer,
             pheader->write_pointer,
             pheader->size,
             who);
      return -1;
   }
 
   int remaining = 0;
   if (rp < pheader->write_pointer) {
      remaining = pheader->write_pointer - rp;
   } else {
      remaining = pheader->size - rp;
      remaining += pheader->write_pointer;
   }
 
   //printf("bm_next_rp: total_size %d, remaining %d, rp %d, wp %d, size %d\n", total_size, remaining, rp, pheader->write_pointer, pheader->size);
 
   if (total_size > remaining) {
      cm_msg(MERROR, "bm_next_rp",
             "error: buffer \"%s\" is corrupted: rp %d points to an invalid event: data_size %d, event size %d, total_size %d, buffer read_pointer %d, write_pointer %d, size %d, remaining %d, called from %s",
             pheader->name,
             rp,
             pevent->data_size,
             event_size,
             total_size,
             pheader->read_pointer,
             pheader->write_pointer,
             pheader->size,
             remaining,
             who);
      return -1;
   }
 
   rp = bm_incr_rp_no_check(pheader, rp, total_size);
 
   return rp;
}
 
static int bm_validate_buffer_locked(const BUFFER *pbuf) {
   const BUFFER_HEADER *pheader = pbuf->buffer_header;
   const char *pdata = (const char *) (pheader + 1);
 
   //printf("bm_validate_buffer: buffer \"%s\"\n", pheader->name);
 
   //printf("size: %d, rp: %d, wp: %d\n", pheader->size, pheader->read_pointer, pheader->write_pointer);
 
   //printf("clients: max: %d, num: %d, MAX_CLIENTS: %d\n", pheader->max_client_index, pheader->num_clients, MAX_CLIENTS);
 
   if (pheader->read_pointer < 0 || pheader->read_pointer >= pheader->size) {
      cm_msg(MERROR, "bm_validate_buffer",
             "buffer \"%s\" is corrupted: invalid read pointer %d. Size %d, write pointer %d", pheader->name,
             pheader->read_pointer, pheader->size, pheader->write_pointer);
      return BM_CORRUPTED;
   }
 
   if (pheader->write_pointer < 0 || pheader->write_pointer >= pheader->size) {
      cm_msg(MERROR, "bm_validate_buffer",
             "buffer \"%s\" is corrupted: invalid write pointer %d. Size %d, read pointer %d", pheader->name,
             pheader->write_pointer, pheader->size, pheader->read_pointer);
      return BM_CORRUPTED;
   }
 
   if (!bm_validate_rp("bm_validate_buffer_locked", pheader, pheader->read_pointer)) {
      cm_msg(MERROR, "bm_validate_buffer", "buffer \"%s\" is corrupted: read pointer %d is invalid", pheader->name,
             pheader->read_pointer);
      return BM_CORRUPTED;
   }
 
   int rp = pheader->read_pointer;
   int rp0 = -1;
   while (rp != pheader->write_pointer) {
      if (!bm_validate_rp("bm_validate_buffer_locked", pheader, rp)) {
         cm_msg(MERROR, "bm_validate_buffer", "buffer \"%s\" is corrupted: invalid rp %d, last good event at rp %d",
                pheader->name, rp, rp0);
         return BM_CORRUPTED;
      }
      //bm_print_event(pdata, rp);
      int rp1 = bm_next_rp("bm_validate_buffer_locked", pheader, pdata, rp);
      if (rp1 < 0) {
         cm_msg(MERROR, "bm_validate_buffer",
                "buffer \"%s\" is corrupted: invalid event at rp %d, last good event at rp %d", pheader->name, rp, rp0);
         return BM_CORRUPTED;
      }
      rp0 = rp;
      rp = rp1;
   }
 
   int i;
   for (i = 0; i < MAX_CLIENTS; i++) {
      const BUFFER_CLIENT *c = &pheader->client[i];
      if (c->pid == 0)
         continue;
      BOOL get_all = FALSE;
      int j;
      for (j = 0; j < MAX_EVENT_REQUESTS; j++) {
         const EVENT_REQUEST *r = &c->event_request[j];
         if (!r->valid)
            continue;
         BOOL xget_all = r->sampling_type == GET_ALL;
         get_all = (get_all || xget_all);
         //printf("client slot %d: pid %d, name \"%s\", request %d: id %d, valid %d, sampling_type %d, get_all %d\n", i, c->pid, c->name, j, r->id, r->valid, r->sampling_type, xget_all);
      }
 
      int rp = c->read_pointer;
      int rp0 = -1;
      while (rp != pheader->write_pointer) {
         //bm_print_event(pdata, rp);
         int rp1 = bm_next_rp("bm_validate_buffer_locked", pheader, pdata, rp);
         if (rp1 < 0) {
            cm_msg(MERROR, "bm_validate_buffer",
                   "buffer \"%s\" is corrupted for client \"%s\" rp %d: invalid event at rp %d, last good event at rp %d",
                   pheader->name, c->name, c->read_pointer, rp, rp0);
            return BM_CORRUPTED;
         }
         rp0 = rp;
         rp = rp1;
      }
   }
 
   return BM_SUCCESS;
}
 
static void bm_reset_buffer_locked(BUFFER *pbuf) {
   BUFFER_HEADER *pheader = pbuf->buffer_header;
 
   //printf("bm_reset_buffer: buffer \"%s\"\n", pheader->name);
 
   pheader->read_pointer = 0;
   pheader->write_pointer = 0;
 
   int i;
   for (i = 0; i < pheader->max_client_index; i++) {
      BUFFER_CLIENT *pc = pheader->client + i;
      if (pc->pid) {
         pc->read_pointer = 0;
      }
   }
}
 
static void bm_clear_buffer_statistics(HNDLE hDB, BUFFER *pbuf) {
   std::string str = msprintf("/System/buffers/%s/Clients/%s/writes_blocked_by", pbuf->buffer_name, pbuf->client_name);
   //printf("delete [%s]\n", str);
   db_delete(hDB, 0, str.c_str());
}
 
struct BUFFER_INFO
{
   BOOL get_all_flag = false;         
   /* buffer statistics */
   int count_lock = 0;                
   int count_sent = 0;                
   double bytes_sent = 0;             
   int count_write_wait = 0;          
   DWORD time_write_wait = 0;         
   int last_count_lock = 0;           
   DWORD wait_start_time = 0;         
   int wait_client_index = 0;         
   int max_requested_space = 0;       
   int count_read = 0;                
   double bytes_read = 0;             
   int client_count_write_wait[MAX_CLIENTS]; 
   DWORD client_time_write_wait[MAX_CLIENTS]; 
   BUFFER_INFO(BUFFER* pbuf)
   {
      get_all_flag = pbuf->get_all_flag;
 
      /* buffer statistics */
      count_lock        = pbuf->count_lock;
      count_sent        = pbuf->count_sent;
      bytes_sent        = pbuf->bytes_sent;
      count_write_wait  = pbuf->count_write_wait;
      time_write_wait   = pbuf->time_write_wait;
      last_count_lock   = pbuf->last_count_lock;
      wait_start_time   = pbuf->wait_start_time;
      wait_client_index = pbuf->wait_client_index;
      max_requested_space = pbuf->max_requested_space;
      count_read        = pbuf->count_read;
      bytes_read        = pbuf->bytes_read;
 
      for (int i=0; i<MAX_CLIENTS; i++) {
         client_count_write_wait[i] = pbuf->client_count_write_wait[i];
         client_time_write_wait[i] = pbuf->client_time_write_wait[i];
      }
   };
};
 
static void bm_write_buffer_statistics_to_odb_copy(HNDLE hDB, const char* buffer_name, const char* client_name, int client_index, BUFFER_INFO *pbuf, BUFFER_HEADER* pheader)
{
   int status;
 
   DWORD now = ss_millitime();
 
   HNDLE hKey;
   status = db_find_key(hDB, 0, "/System/Buffers", &hKey);
   if (status != DB_SUCCESS) {
      db_create_key(hDB, 0, "/System/Buffers", TID_KEY);
      status = db_find_key(hDB, 0, "/System/Buffers", &hKey);
      if (status != DB_SUCCESS)
         return;
   }
 
   HNDLE hKeyBuffer;
   status = db_find_key(hDB, hKey, buffer_name, &hKeyBuffer);
   if (status != DB_SUCCESS) {
      db_create_key(hDB, hKey, buffer_name, TID_KEY);
      status = db_find_key(hDB, hKey, buffer_name, &hKeyBuffer);
      if (status != DB_SUCCESS)
         return;
   }
 
   double buf_size = pheader->size;
   double buf_rptr = pheader->read_pointer;
   double buf_wptr = pheader->write_pointer;
 
   double buf_fill = 0;
   double buf_cptr = 0;
   double buf_cused = 0;
   double buf_cused_pct = 0;
 
   if (client_index >= 0 && client_index <= pheader->max_client_index) {
      buf_cptr = pheader->client[client_index].read_pointer;
 
      if (buf_wptr == buf_cptr) {
         buf_cused = 0;
      } else if (buf_wptr > buf_cptr) {
         buf_cused = buf_wptr - buf_cptr;
      } else {
         buf_cused = (buf_size - buf_cptr) + buf_wptr;
      }
      
      buf_cused_pct = buf_cused / buf_size * 100.0;
      
      // we cannot write buf_cused and buf_cused_pct into the buffer statistics
      // because some other GET_ALL client may have different buf_cused & etc,
      // so they must be written into the per-client statistics
      // and the web page should look at all the GET_ALL clients and used
      // the biggest buf_cused as the whole-buffer "bytes used" value.
   }
 
   if (buf_wptr == buf_rptr) {
      buf_fill = 0;
   } else if (buf_wptr > buf_rptr) {
      buf_fill = buf_wptr - buf_rptr;
   } else {
      buf_fill = (buf_size - buf_rptr) + buf_wptr;
   }
 
   double buf_fill_pct = buf_fill / buf_size * 100.0;
 
   db_set_value(hDB, hKeyBuffer, "Size", &buf_size, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyBuffer, "Write pointer", &buf_wptr, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyBuffer, "Read pointer", &buf_rptr, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyBuffer, "Filled", &buf_fill, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyBuffer, "Filled pct", &buf_fill_pct, sizeof(double), 1, TID_DOUBLE);
 
   status = db_find_key(hDB, hKeyBuffer, "Clients", &hKey);
   if (status != DB_SUCCESS) {
      db_create_key(hDB, hKeyBuffer, "Clients", TID_KEY);
      status = db_find_key(hDB, hKeyBuffer, "Clients", &hKey);
      if (status != DB_SUCCESS)
         return;
   }
 
   HNDLE hKeyClient;
   status = db_find_key(hDB, hKey, client_name, &hKeyClient);
   if (status != DB_SUCCESS) {
      db_create_key(hDB, hKey, client_name, TID_KEY);
      status = db_find_key(hDB, hKey, client_name, &hKeyClient);
      if (status != DB_SUCCESS)
         return;
   }
 
   db_set_value(hDB, hKeyClient, "count_lock", &pbuf->count_lock, sizeof(int), 1, TID_INT32);
   db_set_value(hDB, hKeyClient, "count_sent", &pbuf->count_sent, sizeof(int), 1, TID_INT32);
   db_set_value(hDB, hKeyClient, "bytes_sent", &pbuf->bytes_sent, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyClient, "count_write_wait", &pbuf->count_write_wait, sizeof(int), 1, TID_INT32);
   db_set_value(hDB, hKeyClient, "time_write_wait", &pbuf->time_write_wait, sizeof(DWORD), 1, TID_UINT32);
   db_set_value(hDB, hKeyClient, "max_bytes_write_wait", &pbuf->max_requested_space, sizeof(INT), 1, TID_INT32);
   db_set_value(hDB, hKeyClient, "count_read", &pbuf->count_read, sizeof(int), 1, TID_INT32);
   db_set_value(hDB, hKeyClient, "bytes_read", &pbuf->bytes_read, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyClient, "get_all_flag", &pbuf->get_all_flag, sizeof(BOOL), 1, TID_BOOL);
   db_set_value(hDB, hKeyClient, "read_pointer", &buf_cptr, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyClient, "bytes_used", &buf_cused, sizeof(double), 1, TID_DOUBLE);
   db_set_value(hDB, hKeyClient, "pct_used", &buf_cused_pct, sizeof(double), 1, TID_DOUBLE);
 
   for (int i = 0; i < MAX_CLIENTS; i++) {
      if (!pbuf->client_count_write_wait[i])
         continue;
      
      if (pheader->client[i].pid == 0)
         continue;
      
      if (pheader->client[i].name[0] == 0)
         continue;
      
      char str[100 + NAME_LENGTH];
      
      sprintf(str, "writes_blocked_by/%s/count_write_wait", pheader->client[i].name);
      db_set_value(hDB, hKeyClient, str, &pbuf->client_count_write_wait[i], sizeof(int), 1, TID_INT32);
      
      sprintf(str, "writes_blocked_by/%s/time_write_wait", pheader->client[i].name);
      db_set_value(hDB, hKeyClient, str, &pbuf->client_time_write_wait[i], sizeof(DWORD), 1, TID_UINT32);
   }
 
   db_set_value(hDB, hKeyBuffer, "Last updated", &now, sizeof(DWORD), 1, TID_UINT32);
   db_set_value(hDB, hKeyClient, "last_updated", &now, sizeof(DWORD), 1, TID_UINT32);
}
 
static void bm_write_buffer_statistics_to_odb(HNDLE hDB, BUFFER *pbuf, BOOL force)
{
   //printf("bm_buffer_write_statistics_to_odb: buffer [%s] client [%s], lock count %d -> %d, force %d\n", pbuf->buffer_name, pbuf->client_name, pbuf->last_count_lock, pbuf->count_lock, force);
 
   bm_lock_buffer_guard pbuf_guard(pbuf);
 
   if (!pbuf_guard.is_locked())
      return;
 
   if (!force) {
      if (pbuf->count_lock == pbuf->last_count_lock) {
         return;
      }
   }
 
   std::string buffer_name = pbuf->buffer_name;
   std::string client_name = pbuf->client_name;
 
   if ((strlen(buffer_name.c_str()) < 1) || (strlen(client_name.c_str()) < 1)) {
      // do not call cm_msg() while holding buffer lock, if we are SYSMSG, we will deadlock. K.O.
      pbuf_guard.unlock(); // unlock before cm_msg()
      cm_msg(MERROR, "bm_write_buffer_statistics_to_odb", "Invalid empty buffer name \"%s\" or client name \"%s\"", buffer_name.c_str(), client_name.c_str());
      return;
   }
 
   pbuf->last_count_lock = pbuf->count_lock;
 
   BUFFER_INFO xbuf(pbuf);
   BUFFER_HEADER xheader = *pbuf->buffer_header;
   int client_index = pbuf->client_index;
 
   pbuf_guard.unlock();
 
   bm_write_buffer_statistics_to_odb_copy(hDB, buffer_name.c_str(), client_name.c_str(), client_index, &xbuf, &xheader);
}
 
static BUFFER* bm_get_buffer(const char* who, int buffer_handle, int* pstatus)
{
   size_t sbuffer_handle = buffer_handle;
 
   size_t  nbuf = 0;
   BUFFER* pbuf = NULL;
 
   gBuffersMutex.lock();
 
   nbuf = gBuffers.size();
   if (buffer_handle >=1 && sbuffer_handle <= nbuf) {
      pbuf = gBuffers[buffer_handle-1];
   }
 
   gBuffersMutex.unlock();
 
   if (sbuffer_handle > nbuf || buffer_handle <= 0) {
      if (who)
         cm_msg(MERROR, who, "invalid buffer handle %d: out of range [1..%d]", buffer_handle, (int)nbuf);
      if (pstatus)
         *pstatus = BM_INVALID_HANDLE;
      return NULL;
   }
   
   if (!pbuf) {
      if (who)
         cm_msg(MERROR, who, "invalid buffer handle %d: empty slot", buffer_handle);
      if (pstatus)
         *pstatus = BM_INVALID_HANDLE;
      return NULL;
   }
   
   if (!pbuf->attached) {
      if (who)
         cm_msg(MERROR, who, "invalid buffer handle %d: not attached", buffer_handle);
      if (pstatus)
         *pstatus = BM_INVALID_HANDLE;
      return NULL;
   }
   
   if (pstatus)
      *pstatus = BM_SUCCESS;
 
   return pbuf;
}
 
#endif // LOCAL_ROUTINES
 
/********************************************************************/
INT bm_open_buffer(const char *buffer_name, INT buffer_size, INT *buffer_handle) {
   INT status;
 
   if (rpc_is_remote()) {
      status = rpc_call(RPC_BM_OPEN_BUFFER, buffer_name, buffer_size, buffer_handle);
 
      HNDLE hDB;
      status = cm_get_experiment_database(&hDB, NULL);
      if (status != SUCCESS || hDB == 0) {
         cm_msg(MERROR, "bm_open_buffer", "cannot open buffer \'%s\' - not connected to ODB", buffer_name);
         return BM_NO_SHM;
      }
 
      _bm_max_event_size = DEFAULT_MAX_EVENT_SIZE;
 
      int size = sizeof(INT);
      status = db_get_value(hDB, 0, "/Experiment/MAX_EVENT_SIZE", &_bm_max_event_size, &size, TID_UINT32, TRUE);
 
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "bm_open_buffer", "Cannot get ODB /Experiment/MAX_EVENT_SIZE, db_get_value() status %d",
                status);
         return status;
      }
 
      return status;
   }
#ifdef LOCAL_ROUTINES
   {
      HNDLE shm_handle;
      size_t shm_size;
      HNDLE hDB;
      const int max_buffer_size = 2 * 1000 * 1024 * 1024; // limited by 32-bit integers in the buffer header
 
      bm_cleanup("bm_open_buffer", ss_millitime(), FALSE);
 
      if (!buffer_name || !buffer_name[0]) {
         cm_msg(MERROR, "bm_open_buffer", "cannot open buffer with zero name");
         return BM_INVALID_PARAM;
      }
 
      if (strlen(buffer_name) >= NAME_LENGTH) {
         cm_msg(MERROR, "bm_open_buffer", "buffer name \"%s\" is longer than %d bytes", buffer_name, NAME_LENGTH);
         return BM_INVALID_PARAM;
      }
 
      status = cm_get_experiment_database(&hDB, NULL);
 
      if (status != SUCCESS || hDB == 0) {
         //cm_msg(MERROR, "bm_open_buffer", "cannot open buffer \'%s\' - not connected to ODB", buffer_name);
         return BM_NO_SHM;
      }
 
      /* get buffer size from ODB, user parameter as default if not present in ODB */
      std::string odb_path;
      odb_path += "/Experiment/Buffer sizes/";
      odb_path += buffer_name;
 
      int size = sizeof(INT);
      status = db_get_value(hDB, 0, odb_path.c_str(), &buffer_size, &size, TID_UINT32, TRUE);
 
      if (buffer_size <= 0 || buffer_size > max_buffer_size) {
         cm_msg(MERROR, "bm_open_buffer",
                "Cannot open buffer \"%s\", invalid buffer size %d in ODB \"%s\", maximum buffer size is %d",
                buffer_name, buffer_size, odb_path.c_str(), max_buffer_size);
         return BM_INVALID_PARAM;
      }
 
      _bm_max_event_size = DEFAULT_MAX_EVENT_SIZE;
 
      size = sizeof(INT);
      status = db_get_value(hDB, 0, "/Experiment/MAX_EVENT_SIZE", &_bm_max_event_size, &size, TID_UINT32, TRUE);
 
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "bm_open_buffer", "Cannot get ODB /Experiment/MAX_EVENT_SIZE, db_get_value() status %d",
                status);
         return status;
      }
 
      /* check if buffer already is open */
      gBuffersMutex.lock();
      for (size_t i = 0; i < gBuffers.size(); i++) {
         BUFFER* pbuf = gBuffers[i];
         if (pbuf && pbuf->attached && equal_ustring(pbuf->buffer_name, buffer_name)) {
            *buffer_handle = i + 1;
            gBuffersMutex.unlock();
            return BM_SUCCESS;
         }
      }
      gBuffersMutex.unlock();
 
      // only one thread at a time should create new buffers
 
      static std::mutex gNewBufferMutex;
      std::lock_guard<std::mutex> guard(gNewBufferMutex);
 
      // if we had a race against another thread
      // and while we were waiting for gNewBufferMutex
      // the other thread created this buffer, we return it.
 
      gBuffersMutex.lock();
      for (size_t i = 0; i < gBuffers.size(); i++) {
         BUFFER* pbuf = gBuffers[i];
         if (pbuf && pbuf->attached && equal_ustring(pbuf->buffer_name, buffer_name)) {
            *buffer_handle = i + 1;
            gBuffersMutex.unlock();
            return BM_SUCCESS;
         }
      }
      gBuffersMutex.unlock();
 
      /* allocate new BUFFER object */
 
      BUFFER* pbuf = new BUFFER;
 
      /* there is no constructor for BUFFER object, we have to zero the arrays manually */
 
      for (int i=0; i<MAX_CLIENTS; i++) {
         pbuf->client_count_write_wait[i] = 0;
         pbuf->client_time_write_wait[i] = 0;
      }
 
      /* create buffer semaphore */
 
      status = ss_semaphore_create(buffer_name, &(pbuf->semaphore));
 
      if (status != SS_CREATED && status != SS_SUCCESS) {
         *buffer_handle = 0;
         delete pbuf;
         return BM_NO_SEMAPHORE;
      }
 
      std::string client_name = cm_get_client_name();
 
      /* store client name */
      mstrlcpy(pbuf->client_name, client_name.c_str(), sizeof(pbuf->client_name));
 
      /* store buffer name */
      mstrlcpy(pbuf->buffer_name, buffer_name, sizeof(pbuf->buffer_name));
 
      /* lock buffer semaphore to avoid race with bm_open_buffer() in a different program */
 
      pbuf->attached = true; // required by bm_lock_buffer()
 
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked()) {
         // cannot happen, no other thread can see this pbuf
         abort();
         return BM_NO_SEMAPHORE;
      }
 
      /* open shared memory */
 
      void *p = NULL;
      status = ss_shm_open(buffer_name, sizeof(BUFFER_HEADER) + buffer_size, &p, &shm_size, &shm_handle, FALSE);
 
      if (status != SS_SUCCESS && status != SS_CREATED) {
         *buffer_handle = 0;
         pbuf_guard.unlock();
         pbuf_guard.invalidate(); // destructor will see a deleted pbuf
         delete pbuf;
         return BM_NO_SHM;
      }
 
      pbuf->buffer_header = (BUFFER_HEADER *) p;
 
      BUFFER_HEADER *pheader = pbuf->buffer_header;
 
      bool shm_created = (status == SS_CREATED);
 
      if (shm_created) {
         /* initialize newly created shared memory */
 
         memset(pheader, 0, sizeof(BUFFER_HEADER) + buffer_size);
 
         mstrlcpy(pheader->name, buffer_name, sizeof(pheader->name));
         pheader->size = buffer_size;
 
      } else {
         /* validate existing shared memory */
 
         if (!equal_ustring(pheader->name, buffer_name)) {
            // unlock before calling cm_msg(). if we are SYSMSG, we wil ldeadlock. K.O.
            pbuf_guard.unlock();
            pbuf_guard.invalidate(); // destructor will see a deleted pbuf
            cm_msg(MERROR, "bm_open_buffer",
                   "Buffer \"%s\" is corrupted, mismatch of buffer name in shared memory \"%s\"", buffer_name,
                   pheader->name);
            *buffer_handle = 0;
            delete pbuf;
            return BM_CORRUPTED;
         }
 
         if ((pheader->num_clients < 0) || (pheader->num_clients > MAX_CLIENTS)) {
            // unlock before calling cm_msg(). if we are SYSMSG, we wil ldeadlock. K.O.
            pbuf_guard.unlock();
            pbuf_guard.invalidate(); // destructor will see a deleted pbuf
            cm_msg(MERROR, "bm_open_buffer", "Buffer \"%s\" is corrupted, num_clients %d exceeds MAX_CLIENTS %d",
                   buffer_name, pheader->num_clients, MAX_CLIENTS);
            *buffer_handle = 0;
            delete pbuf;
            return BM_CORRUPTED;
         }
 
         if ((pheader->max_client_index < 0) || (pheader->max_client_index > MAX_CLIENTS)) {
            // unlock before calling cm_msg(). if we are SYSMSG, we wil ldeadlock. K.O.
            pbuf_guard.unlock();
            pbuf_guard.invalidate(); // destructor will see a deleted pbuf
            cm_msg(MERROR, "bm_open_buffer", "Buffer \"%s\" is corrupted, max_client_index %d exceeds MAX_CLIENTS %d",
                   buffer_name, pheader->max_client_index, MAX_CLIENTS);
            *buffer_handle = 0;
            delete pbuf;
            return BM_CORRUPTED;
         }
 
         /* check if buffer size is identical */
         if (pheader->size != buffer_size) {
            cm_msg(MINFO, "bm_open_buffer", "Buffer \"%s\" requested size %d differs from existing size %d",
                   buffer_name, buffer_size, pheader->size);
 
            buffer_size = pheader->size;
 
            ss_shm_close(buffer_name, p, shm_size, shm_handle, FALSE);
 
            status = ss_shm_open(buffer_name, sizeof(BUFFER_HEADER) + buffer_size, &p, &shm_size, &shm_handle, FALSE);
 
            if (status != SS_SUCCESS) {
               *buffer_handle = 0;
               pbuf_guard.unlock();
               pbuf_guard.invalidate(); // destructor will see a deleted pbuf
               delete pbuf;
               return BM_NO_SHM;
            }
 
            pbuf->buffer_header = (BUFFER_HEADER *) p;
            pheader = pbuf->buffer_header;
         }
      }
 
      /* shared memory is good from here down */
 
      pbuf->attached = true;
 
      pbuf->shm_handle = shm_handle;
      pbuf->shm_size = shm_size;
      pbuf->callback = FALSE;
 
      bm_cleanup_buffer_locked(pbuf, "bm_open_buffer", ss_millitime());
 
      status = bm_validate_buffer_locked(pbuf);
      if (status != BM_SUCCESS) {
         cm_msg(MERROR, "bm_open_buffer",
                "buffer \'%s\' is corrupted, bm_validate_buffer() status %d, calling bm_reset_buffer()...", buffer_name,
                status);
         bm_reset_buffer_locked(pbuf);
         cm_msg(MINFO, "bm_open_buffer", "buffer \'%s\' was reset, all buffered events were lost", buffer_name);
      }
 
      /* add our client BUFFER_HEADER */
 
      int iclient = 0;
      for (; iclient < MAX_CLIENTS; iclient++)
         if (pheader->client[iclient].pid == 0)
            break;
 
      if (iclient == MAX_CLIENTS) {
         *buffer_handle = 0;
         // unlock before calling cm_msg(). if we are SYSMSG, we wil ldeadlock. K.O.
         pbuf_guard.unlock();
         pbuf_guard.invalidate(); // destructor will see a deleted pbuf
         delete pbuf;
         cm_msg(MERROR, "bm_open_buffer", "buffer \'%s\' maximum number of clients %d exceeded", buffer_name, MAX_CLIENTS);
         return BM_NO_SLOT;
      }
 
      /* store slot index in _buffer structure */
      pbuf->client_index = iclient;
 
      /*
         Save the index of the last client of that buffer so that later only
         the clients 0..max_client_index-1 have to be searched through.
       */
      pheader->num_clients++;
      if (iclient + 1 > pheader->max_client_index)
         pheader->max_client_index = iclient + 1;
 
      /* setup buffer header and client structure */
      BUFFER_CLIENT *pclient = &pheader->client[iclient];
 
      memset(pclient, 0, sizeof(BUFFER_CLIENT));
 
      mstrlcpy(pclient->name, client_name.c_str(), sizeof(pclient->name));
 
      pclient->pid = ss_getpid();
 
      ss_suspend_get_buffer_port(ss_gettid(), &pclient->port);
 
      pclient->read_pointer = pheader->write_pointer;
      pclient->last_activity = ss_millitime();
 
      cm_get_watchdog_params(NULL, &pclient->watchdog_timeout);
 
      pbuf_guard.unlock();
 
      /* shared memory is not locked from here down, do not touch pheader and pbuf->buffer_header! */
 
      pheader = NULL;
 
      /* we are not holding any locks from here down, but other threads cannot see this pbuf yet */
 
      bm_clear_buffer_statistics(hDB, pbuf);
      bm_write_buffer_statistics_to_odb(hDB, pbuf, true);
 
      /* add pbuf to buffer list */
 
      gBuffersMutex.lock();
 
      bool added = false;
      for (size_t i=0; i<gBuffers.size(); i++) {
         if (gBuffers[i] == NULL) {
            gBuffers[i] = pbuf;
            added = true;
            *buffer_handle = i+1;
            break;
         }
      }
      if (!added) {
         *buffer_handle = gBuffers.size() + 1;
         gBuffers.push_back(pbuf);
      }
 
      /* from here down we should not touch pbuf without locking it */
 
      pbuf = NULL;
 
      gBuffersMutex.unlock();
 
      /* new buffer is now ready for use */
 
      /* initialize buffer counters */
      bm_init_buffer_counters(*buffer_handle);
 
      bm_cleanup("bm_open_buffer", ss_millitime(), FALSE);
 
      if (shm_created)
         return BM_CREATED;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_get_buffer_handle(const char* buffer_name, INT *buffer_handle)
{
   gBuffersMutex.lock();
   for (size_t i = 0; i < gBuffers.size(); i++) {
      BUFFER* pbuf = gBuffers[i];
      if (pbuf && pbuf->attached && equal_ustring(pbuf->buffer_name, buffer_name)) {
         *buffer_handle = i + 1;
         gBuffersMutex.unlock();
         return BM_SUCCESS;
      }
   }
   gBuffersMutex.unlock();
   return BM_NOT_FOUND;
}
 
/********************************************************************/
INT bm_close_buffer(INT buffer_handle) {
   //printf("bm_close_buffer: handle %d\n", buffer_handle);
 
   if (rpc_is_remote())
      return rpc_call(RPC_BM_CLOSE_BUFFER, buffer_handle);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer(NULL, buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      //printf("bm_close_buffer: handle %d, name [%s]\n", buffer_handle, pheader->name);
 
      int i;
 
      { /* delete all requests for this buffer */
         _request_list_mutex.lock();
         std::vector<EventRequest> request_list_copy = _request_list;
         _request_list_mutex.unlock();
         for (size_t i = 0; i < request_list_copy.size(); i++) {
            if (request_list_copy[i].buffer_handle == buffer_handle) {
               bm_delete_request(i);
            }
         }
      }
 
      HNDLE hDB;
      cm_get_experiment_database(&hDB, NULL);
 
      if (hDB) {
         /* write statistics to odb */
         bm_write_buffer_statistics_to_odb(hDB, pbuf, TRUE);
      }
 
      /* lock buffer in correct order */
 
      status = bm_lock_buffer_read_cache(pbuf);
 
      if (status != BM_SUCCESS) {
         return status;
      }
 
      status = bm_lock_buffer_write_cache(pbuf);
 
      if (status != BM_SUCCESS) {
         pbuf->read_cache_mutex.unlock();
         return status;
      }
 
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked()) {
         pbuf->write_cache_mutex.unlock();
         pbuf->read_cache_mutex.unlock();
         return pbuf_guard.get_status();
      }
 
      BUFFER_HEADER *pheader = pbuf->buffer_header;
 
      /* mark entry in _buffer as empty */
      pbuf->attached = false;
 
      BUFFER_CLIENT* pclient = bm_get_my_client_locked(pbuf_guard);
 
      if (pclient) {
         /* clear entry from client structure in buffer header */
         memset(pclient, 0, sizeof(BUFFER_CLIENT));
      }
 
      /* calculate new max_client_index entry */
      for (i = MAX_CLIENTS - 1; i >= 0; i--)
         if (pheader->client[i].pid != 0)
            break;
      pheader->max_client_index = i + 1;
 
      /* count new number of clients */
      int j = 0;
      for (i = MAX_CLIENTS - 1; i >= 0; i--)
         if (pheader->client[i].pid != 0)
            j++;
      pheader->num_clients = j;
 
      int destroy_flag = (pheader->num_clients == 0);
 
      // we hold the locks on the read cache and the write cache.
 
      /* free cache */
      if (pbuf->read_cache_size > 0) {
         free(pbuf->read_cache);
         pbuf->read_cache = NULL;
         pbuf->read_cache_size = 0;
         pbuf->read_cache_rp = 0;
         pbuf->read_cache_wp = 0;
      }
 
      if (pbuf->write_cache_size > 0) {
         free(pbuf->write_cache);
         pbuf->write_cache = NULL;
         pbuf->write_cache_size = 0;
         pbuf->write_cache_rp = 0;
         pbuf->write_cache_wp = 0;
      }
 
      /* check if anyone is waiting and wake him up */
 
      for (int i = 0; i < pheader->max_client_index; i++) {
         BUFFER_CLIENT *pclient = pheader->client + i;
         if (pclient->pid && (pclient->write_wait || pclient->read_wait))
            ss_resume(pclient->port, "B  ");
      }
 
      /* unmap shared memory, delete it if we are the last */
 
      ss_shm_close(pbuf->buffer_name, pbuf->buffer_header, pbuf->shm_size, pbuf->shm_handle, destroy_flag);
 
      /* after ss_shm_close() these are invalid: */
 
      pheader = NULL;
      pbuf->buffer_header = NULL;
      pbuf->shm_size = 0;
      pbuf->shm_handle = 0;
 
      /* unlock buffer in correct order */
 
      pbuf_guard.unlock();
 
      pbuf->write_cache_mutex.unlock();
      pbuf->read_cache_mutex.unlock();
 
      /* delete semaphore */
 
      ss_semaphore_delete(pbuf->semaphore, destroy_flag);
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_close_all_buffers(void) {
   if (rpc_is_remote())
      return rpc_call(RPC_BM_CLOSE_ALL_BUFFERS);
 
#ifdef LOCAL_ROUTINES
   {
      cm_msg_close_buffer();
 
      gBuffersMutex.lock();
      size_t nbuf = gBuffers.size();
      gBuffersMutex.unlock();
 
      for (size_t i = nbuf; i > 0; i--) {
         bm_close_buffer(i);
      }
 
      gBuffersMutex.lock();
      for (size_t i=0; i< gBuffers.size(); i++) {
         BUFFER* pbuf = gBuffers[i];
         if (!pbuf)
            continue;
         delete pbuf;
         pbuf = NULL;
         gBuffers[i] = NULL;
      }
      gBuffersMutex.unlock();
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_write_statistics_to_odb(void) {
#ifdef LOCAL_ROUTINES
   {
      int status;
      HNDLE hDB;
 
      status = cm_get_experiment_database(&hDB, NULL);
 
      if (status != CM_SUCCESS) {
         //printf("bm_write_statistics_to_odb: cannot get ODB handle!\n");
         return BM_SUCCESS;
      }
 
      std::vector<BUFFER*> mybuffers;
      
      gBuffersMutex.lock();
      mybuffers = gBuffers;
      gBuffersMutex.unlock();
 
      for (BUFFER* pbuf : mybuffers) {
         if (!pbuf || !pbuf->attached)
            continue;
         bm_write_buffer_statistics_to_odb(hDB, pbuf, FALSE);
      }
   }
#endif /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
 
/*-- Watchdog routines ---------------------------------------------*/
#ifdef LOCAL_ROUTINES
 
static std::atomic<bool> _watchdog_thread_run{false}; // set by main thread
static std::atomic<bool> _watchdog_thread_is_running{false}; // set by watchdog thread
static std::atomic<std::thread*> _watchdog_thread{NULL};
 
/********************************************************************/
INT cm_watchdog_thread(void *unused) {
   _watchdog_thread_is_running = true;
   //printf("cm_watchdog_thread started!\n");
   while (_watchdog_thread_run) {
      //printf("cm_watchdog_thread runs!\n");
      DWORD now = ss_millitime();
      bm_update_last_activity(now);
      db_update_last_activity(now);
      int i;
      for (i = 0; i < 20; i++) {
         ss_sleep(100);
         if (!_watchdog_thread_run)
            break;
      }
   }
   //printf("cm_watchdog_thread stopped!\n");
   _watchdog_thread_is_running = false;
   return 0;
}
 
static void xcm_watchdog_thread() {
   cm_watchdog_thread(NULL);
}
 
#endif
 
INT cm_start_watchdog_thread() {
   /* watchdog does not run inside remote clients.
    * watchdog timeout timers are maintained by the mserver */
   if (rpc_is_remote())
      return CM_SUCCESS;
#ifdef LOCAL_ROUTINES
   /* only start once */
   if (_watchdog_thread)
      return CM_SUCCESS;
   _watchdog_thread_run = true;
   _watchdog_thread.store(new std::thread(xcm_watchdog_thread));
#endif
   return CM_SUCCESS;
}
 
INT cm_stop_watchdog_thread() {
   /* watchdog does not run inside remote clients.
    * watchdog timeout timers are maintained by the mserver */
   if (rpc_is_remote())
      return CM_SUCCESS;
#ifdef LOCAL_ROUTINES
   _watchdog_thread_run = false;
   while (_watchdog_thread_is_running) {
      //printf("waiting for watchdog thread to shut down\n");
      ss_sleep(10);
   }
   if (_watchdog_thread != NULL) {
      _watchdog_thread.load()->join();
      delete static_cast<std::thread *>(_watchdog_thread);
      _watchdog_thread = NULL;
   }
#endif
   return CM_SUCCESS;
}
 
/********************************************************************/
INT cm_shutdown(const char *name, BOOL bUnique) {
   INT status, return_status, i, size;
   HNDLE hDB, hKeyClient, hKey, hSubkey, hKeyTmp, hConn;
   KEY key;
   char client_name[NAME_LENGTH], remote_host[HOST_NAME_LENGTH];
   INT port;
   DWORD start_time;
   DWORD timeout;
   DWORD last;
 
   cm_get_experiment_database(&hDB, &hKeyClient);
 
   status = db_find_key(hDB, 0, "System/Clients", &hKey);
   if (status != DB_SUCCESS)
      return DB_NO_KEY;
 
   return_status = CM_NO_CLIENT;
 
   /* loop over all clients */
   for (i = 0;; i++) {
      status = db_enum_key(hDB, hKey, i, &hSubkey);
      if (status == DB_NO_MORE_SUBKEYS)
         break;
 
      /* don't shutdown ourselves */
      if (hSubkey == hKeyClient)
         continue;
 
      if (status == DB_SUCCESS) {
         db_get_key(hDB, hSubkey, &key);
 
         /* contact client */
         size = sizeof(client_name);
         status = db_get_value(hDB, hSubkey, "Name", client_name, &size, TID_STRING, FALSE);
         if (status != DB_SUCCESS)
            continue;
 
         if (!bUnique)
            client_name[strlen(name)] = 0;      /* strip number */
 
         /* check if individual client */
         if (!equal_ustring("all", name) && !equal_ustring(client_name, name))
            continue;
 
         size = sizeof(port);
         db_get_value(hDB, hSubkey, "Server Port", &port, &size, TID_INT32, TRUE);
 
         size = sizeof(remote_host);
         db_get_value(hDB, hSubkey, "Host", remote_host, &size, TID_STRING, TRUE);
 
         cm_get_watchdog_info(hDB, name, &timeout, &last);
         if (timeout == 0)
            timeout = 5000;
 
         /* client found -> connect to its server port */
         status = rpc_client_connect(remote_host, port, client_name, &hConn);
         if (status != RPC_SUCCESS) {
            int client_pid = atoi(key.name);
            return_status = CM_NO_CLIENT;
            cm_msg(MERROR, "cm_shutdown", "Cannot connect to client \'%s\' on host \'%s\', port %d",
                   client_name, remote_host, port);
#ifdef SIGKILL
            cm_msg(MERROR, "cm_shutdown", "Killing and Deleting client \'%s\' pid %d", client_name,
                   client_pid);
            kill(client_pid, SIGKILL);
            return_status = CM_SUCCESS;
            status = cm_delete_client_info(hDB, client_pid);
            if (status != CM_SUCCESS)
               cm_msg(MERROR, "cm_shutdown", "Cannot delete client info for client \'%s\', pid %d, status %d",
                      name, client_pid, status);
#endif
         } else {
            /* call disconnect with shutdown=TRUE */
            rpc_client_disconnect(hConn, TRUE);
 
            /* wait until client has shut down */
            start_time = ss_millitime();
            do {
               ss_sleep(100);
               status = db_find_key(hDB, hKey, key.name, &hKeyTmp);
            } while (status == DB_SUCCESS && (ss_millitime() - start_time < timeout));
 
            if (status == DB_SUCCESS) {
               int client_pid = atoi(key.name);
               return_status = CM_NO_CLIENT;
               cm_msg(MERROR, "cm_shutdown", "Client \'%s\' not responding to shutdown command", client_name);
#ifdef SIGKILL
               cm_msg(MERROR, "cm_shutdown", "Killing and Deleting client \'%s\' pid %d", client_name,
                      client_pid);
               kill(client_pid, SIGKILL);
               status = cm_delete_client_info(hDB, client_pid);
               if (status != CM_SUCCESS)
                  cm_msg(MERROR, "cm_shutdown",
                         "Cannot delete client info for client \'%s\', pid %d, status %d", name, client_pid,
                         status);
#endif
               return_status = CM_NO_CLIENT;
            } else {
               return_status = CM_SUCCESS;
               i--;
            }
         }
      }
 
      /* display any message created during each shutdown */
      cm_msg_flush_buffer();
   }
 
   return return_status;
}
 
/********************************************************************/
INT cm_exist(const char *name, BOOL bUnique) {
   INT status, i, size;
   HNDLE hDB, hKeyClient, hKey, hSubkey;
   char client_name[NAME_LENGTH];
 
   if (rpc_is_remote())
      return rpc_call(RPC_CM_EXIST, name, bUnique);
 
   cm_get_experiment_database(&hDB, &hKeyClient);
 
   status = db_find_key(hDB, 0, "System/Clients", &hKey);
   if (status != DB_SUCCESS)
      return DB_NO_KEY;
 
   db_lock_database(hDB);
 
   /* loop over all clients */
   for (i = 0;; i++) {
      status = db_enum_key(hDB, hKey, i, &hSubkey);
      if (status == DB_NO_MORE_SUBKEYS)
         break;
 
      if (hSubkey == hKeyClient)
         continue;
 
      if (status == DB_SUCCESS) {
         /* get client name */
         size = sizeof(client_name);
         status = db_get_value(hDB, hSubkey, "Name", client_name, &size, TID_STRING, FALSE);
 
         if (status != DB_SUCCESS) {
            //fprintf(stderr, "cm_exist: name %s, i=%d, hSubkey=%d, status %d, client_name %s, my name %s\n", name, i, hSubkey, status, client_name, _client_name);
            continue;
         }
 
         if (equal_ustring(client_name, name)) {
            db_unlock_database(hDB);
            return CM_SUCCESS;
         }
 
         if (!bUnique) {
            client_name[strlen(name)] = 0;      /* strip number */
            if (equal_ustring(client_name, name)) {
               db_unlock_database(hDB);
               return CM_SUCCESS;
            }
         }
      }
   }
 
   db_unlock_database(hDB);
 
   return CM_NO_CLIENT;
}
 
/********************************************************************/
INT cm_cleanup(const char *client_name, BOOL ignore_timeout) {
   if (rpc_is_remote())
      return rpc_call(RPC_CM_CLEANUP, client_name);
 
#ifdef LOCAL_ROUTINES
   {
      DWORD interval;
      DWORD now = ss_millitime();
 
      std::vector<BUFFER*> mybuffers;
      
      gBuffersMutex.lock();
      mybuffers = gBuffers;
      gBuffersMutex.unlock();
 
      /* check buffers */
      for (BUFFER* pbuf : mybuffers) {
         if (!pbuf)
            continue;
         if (pbuf->attached) {
            std::string msg;
 
            bm_lock_buffer_guard pbuf_guard(pbuf);
 
            if (!pbuf_guard.is_locked())
               continue;
 
            /* update the last_activity entry to show that we are alive */
            BUFFER_HEADER *pheader = pbuf->buffer_header;
            BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
            pclient->last_activity = ss_millitime();
 
            /* now check other clients */
            for (int j = 0; j < pheader->max_client_index; j++) {
               BUFFER_CLIENT *pbclient = &pheader->client[j];
               if (j != pbuf->client_index && pbclient->pid &&
                   (client_name == NULL || client_name[0] == 0
                    || strncmp(pbclient->name, client_name, strlen(client_name)) == 0)) {
                  if (ignore_timeout)
                     interval = 2 * WATCHDOG_INTERVAL;
                  else
                     interval = pbclient->watchdog_timeout;
 
                  /* If client process has no activity, clear its buffer entry. */
                  if (interval > 0
                      && now > pbclient->last_activity && now - pbclient->last_activity > interval) {
 
                     /* now make again the check with the buffer locked */
                     if (interval > 0
                         && now > pbclient->last_activity && now - pbclient->last_activity > interval) {
                        msg = msprintf(
                                "Client \'%s\' on \'%s\' removed by cm_cleanup (idle %1.1lfs, timeout %1.0lfs)",
                                pbclient->name, pheader->name,
                                (ss_millitime() - pbclient->last_activity) / 1000.0,
                                interval / 1000.0);
 
                        bm_remove_client_locked(pheader, j);
                     }
 
                     /* go again through whole list */
                     j = 0;
                  }
               }
            }
 
            // unlock buffer before calling cm_msg(), if we are SYSMSG, we will deadlock.
            pbuf_guard.unlock();
 
            /* display info message after unlocking buffer */
            if (!msg.empty())
               cm_msg(MINFO, "cm_cleanup", "%s", msg.c_str());
         }
      }
 
      db_cleanup2(client_name, ignore_timeout, now, "cm_cleanup");
   }
#endif                          /* LOCAL_ROUTINES */
 
   return CM_SUCCESS;
}
 
/********************************************************************/
std::string cm_expand_env(const char *str) {
   const char *s = str;
   std::string r;
   for (; *s;) {
      if (*s == '$') {
         s++;
         std::string envname;
         for (; *s;) {
            if (*s == DIR_SEPARATOR)
               break;
            envname += *s;
            s++;
         }
         const char *e = getenv(envname.c_str());
         //printf("expanding [%s] at [%s] envname [%s] value [%s]\n", filename, s, envname.c_str(), e);
         if (!e) {
            //cm_msg(MERROR, "expand_env", "Env.variable \"%s\" cannot be expanded in \"%s\"", envname.c_str(), filename);
            r += '$';
            r += envname;
         } else {
            r += e;
            //if (r[r.length()-1] != DIR_SEPARATOR)
            //r += DIR_SEPARATOR_STR;
         }
      } else {
         r += *s;
         s++;
      }
   }
   return r;
}
 
static bool test_cm_expand_env1(const char *str, const char *expected) {
   std::string s = cm_expand_env(str);
   printf("test_expand_env: [%s] -> [%s] expected [%s]",
          str,
          s.c_str(),
          expected);
   if (s != expected) {
      printf(", MISMATCH!\n");
      return false;
   }
 
   printf("\n");
   return true;
}
 
void cm_test_expand_env() {
   printf("Test expand_end()\n");
   setenv("FOO", "foo", 1);
   setenv("BAR", "bar", 1);
   setenv("EMPTY", "", 1);
   unsetenv("UNDEF");
 
   bool ok = true;
 
   ok &= test_cm_expand_env1("aaa", "aaa");
   ok &= test_cm_expand_env1("$FOO", "foo");
   ok &= test_cm_expand_env1("/$FOO", "/foo");
   ok &= test_cm_expand_env1("/$FOO/", "/foo/");
   ok &= test_cm_expand_env1("$FOO/$BAR", "foo/bar");
   ok &= test_cm_expand_env1("$FOO1", "$FOO1");
   ok &= test_cm_expand_env1("1$FOO", "1foo");
   ok &= test_cm_expand_env1("$UNDEF", "$UNDEF");
   ok &= test_cm_expand_env1("/$UNDEF/", "/$UNDEF/");
 
   if (ok) {
      printf("test_expand_env: all tests passed!\n");
   } else {
      printf("test_expand_env: test FAILED!\n");
   }
}
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT bm_get_buffer_info(INT buffer_handle, BUFFER_HEADER *buffer_header)
/********************************************************************\
 
  Routine: bm_buffer_info
 
  Purpose: Copies the current buffer header referenced by buffer_handle
           into the *buffer_header structure which must be supplied
           by the calling routine.
 
  Input:
    INT buffer_handle       Handle of the buffer to get the header from
 
  Output:
    BUFFER_HEADER *buffer_header   Destination address which gets a copy
                                   of the buffer header structure.
 
  Function value:
    BM_SUCCESS              Successful completion
    BM_INVALID_HANDLE       Buffer handle is invalid
    RPC_NET_ERROR           Network error
 
\********************************************************************/
{
   if (rpc_is_remote())
      return rpc_call(RPC_BM_GET_BUFFER_INFO, buffer_handle, buffer_header);
 
#ifdef LOCAL_ROUTINES
 
   int status = 0;
   BUFFER *pbuf = bm_get_buffer("bm_get_buffer_info", buffer_handle, &status);
 
   if (!pbuf)
      return status;
 
   bm_lock_buffer_guard pbuf_guard(pbuf);
 
   if (!pbuf_guard.is_locked())
      return pbuf_guard.get_status();
 
   memcpy(buffer_header, pbuf->buffer_header, sizeof(BUFFER_HEADER));
 
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_get_buffer_level(INT buffer_handle, INT *n_bytes)
/********************************************************************\
 
  Routine: bm_get_buffer_level
 
  Purpose: Return number of bytes in buffer or in cache
 
  Input:
    INT buffer_handle       Handle of the buffer to get the info
 
  Output:
    INT *n_bytes              Number of bytes in buffer
 
  Function value:
    BM_SUCCESS              Successful completion
    BM_INVALID_HANDLE       Buffer handle is invalid
    RPC_NET_ERROR           Network error
 
\********************************************************************/
{
   if (rpc_is_remote())
      return rpc_call(RPC_BM_GET_BUFFER_LEVEL, buffer_handle, n_bytes);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer("bm_get_buffer_level", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked())
         return pbuf_guard.get_status();
 
      BUFFER_HEADER *pheader = pbuf->buffer_header;
 
      BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
 
      *n_bytes = pheader->write_pointer - pclient->read_pointer;
      if (*n_bytes < 0)
         *n_bytes += pheader->size;
 
      pbuf_guard.unlock();
 
      if (pbuf->read_cache_size) {
         status = bm_lock_buffer_read_cache(pbuf);
         if (status == BM_SUCCESS) {
            /* add bytes in cache */
            if (pbuf->read_cache_wp > pbuf->read_cache_rp)
               *n_bytes += pbuf->read_cache_wp - pbuf->read_cache_rp;
            pbuf->read_cache_mutex.unlock();
         }
      }
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
 
#ifdef LOCAL_ROUTINES
 
/********************************************************************/
static int bm_lock_buffer_read_cache(BUFFER *pbuf)
{
   bool locked = ss_timed_mutex_wait_for_sec(pbuf->read_cache_mutex, "buffer read cache", _bm_mutex_timeout_sec);
 
   if (!locked) {
      fprintf(stderr, "bm_lock_buffer_read_cache: Error: Cannot lock read cache of buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...\n", pbuf->buffer_name);
      cm_msg(MERROR, "bm_lock_buffer_read_cache", "Cannot lock read cache of buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...", pbuf->buffer_name);
      abort();
      /* DOES NOT RETURN */
   }
 
   if (!pbuf->attached) {
      pbuf->read_cache_mutex.unlock();
      fprintf(stderr, "bm_lock_buffer_read_cache: Error: Cannot lock read cache of buffer \"%s\", buffer was closed while we waited for the buffer_mutex\n", pbuf->buffer_name);
      return BM_INVALID_HANDLE;
   }
 
   return BM_SUCCESS;
}
 
/********************************************************************/
static int bm_lock_buffer_write_cache(BUFFER *pbuf)
{
   bool locked = ss_timed_mutex_wait_for_sec(pbuf->write_cache_mutex, "buffer write cache", _bm_mutex_timeout_sec);
 
   if (!locked) {
      fprintf(stderr, "bm_lock_buffer_write_cache: Error: Cannot lock write cache of buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...\n", pbuf->buffer_name);
      cm_msg(MERROR, "bm_lock_buffer_write_cache", "Cannot lock write cache of buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...", pbuf->buffer_name);
      abort();
      /* DOES NOT RETURN */
   }
 
   if (!pbuf->attached) {
      pbuf->write_cache_mutex.unlock();
      fprintf(stderr, "bm_lock_buffer_write_cache: Error: Cannot lock write cache of buffer \"%s\", buffer was closed while we waited for the buffer_mutex\n", pbuf->buffer_name);
      return BM_INVALID_HANDLE;
   }
 
   return BM_SUCCESS;
}
 
/********************************************************************/
static int bm_lock_buffer_mutex(BUFFER *pbuf)
{
   //printf("bm_lock_buffer_mutex %s!\n", pbuf->buffer_name);
 
   bool locked = ss_timed_mutex_wait_for_sec(pbuf->buffer_mutex, "buffer mutex", _bm_mutex_timeout_sec);
 
   if (!locked) {
      fprintf(stderr, "bm_lock_buffer_mutex: Error: Cannot lock buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...\n", pbuf->buffer_name);
      cm_msg(MERROR, "bm_lock_buffer_mutex", "Cannot lock buffer \"%s\", ss_timed_mutex_wait_for_sec() timeout, aborting...", pbuf->buffer_name);
      abort();
      /* DOES NOT RETURN */
   }
 
   if (!pbuf->attached) {
      pbuf->buffer_mutex.unlock();
      fprintf(stderr, "bm_lock_buffer_mutex: Error: Cannot lock buffer \"%s\", buffer was closed while we waited for the buffer_mutex\n", pbuf->buffer_name);
      return BM_INVALID_HANDLE;
   }
 
   //static int counter = 0;
   //counter++;
   //printf("locked %d!\n", counter);
   //if (counter > 50)
   //   ::sleep(3);
 
   return BM_SUCCESS;
}
 
/********************************************************************/
static int xbm_lock_buffer(BUFFER *pbuf)
{
   int status;
 
   // NB: locking order: 1st buffer mutex, 2nd buffer semaphore. Unlock in reverse order.
 
   //if (pbuf->locked) {
   //   fprintf(stderr, "double lock, abort!\n");
   //   abort();
   //}
 
   status = bm_lock_buffer_mutex(pbuf);
 
   if (status != BM_SUCCESS)
      return status;
 
   status = ss_semaphore_wait_for(pbuf->semaphore, 1000);
 
   if (status != SS_SUCCESS) {
      fprintf(stderr, "bm_lock_buffer: Lock buffer \"%s\" is taking longer than 1 second!\n", pbuf->buffer_name);
 
      status = ss_semaphore_wait_for(pbuf->semaphore, 10000);
 
      if (status != SS_SUCCESS) {
         fprintf(stderr, "bm_lock_buffer: Lock buffer \"%s\" is taking longer than 10 seconds, buffer semaphore is probably stuck, delete %s.SHM and try again!\n", pbuf->buffer_name, pbuf->buffer_name);
 
         if (pbuf->buffer_header) {
            for (int i=0; i<MAX_CLIENTS; i++) {
               fprintf(stderr, "bm_lock_buffer: Buffer \"%s\" client %d \"%s\" pid %d\n", pbuf->buffer_name, i, pbuf->buffer_header->client[i].name, pbuf->buffer_header->client[i].pid);
            }
         }
            
         status = ss_semaphore_wait_for(pbuf->semaphore, _bm_lock_timeout);
         
         if (status != SS_SUCCESS) {
            fprintf(stderr, "bm_lock_buffer: Error: Cannot lock buffer \"%s\", ss_semaphore_wait_for() status %d, aborting...\n", pbuf->buffer_name, status);
            cm_msg(MERROR, "bm_lock_buffer", "Cannot lock buffer \"%s\", ss_semaphore_wait_for() status %d, aborting...", pbuf->buffer_name, status);
            abort();
            /* DOES NOT RETURN */
         }
      }
   }
 
   // protect against double lock
   assert(!pbuf->locked);
   pbuf->locked = TRUE;
 
#if 0
   int x = MAX_CLIENTS - 1;
   if (pbuf->buffer_header->client[x].unused1 != 0) {
      printf("lllock [%s] unused1 %d pid %d\n", pbuf->buffer_name, pbuf->buffer_header->client[x].unused1, getpid());
   }
   //assert(pbuf->buffer_header->client[x].unused1 == 0);
   pbuf->buffer_header->client[x].unused1 = getpid();
#endif
 
   pbuf->count_lock++;
 
   return BM_SUCCESS;
}
 
/********************************************************************/
static void xbm_unlock_buffer(BUFFER *pbuf) {
   // NB: locking order: 1st buffer mutex, 2nd buffer semaphore. Unlock in reverse order.
 
#if 0
   int x = MAX_CLIENTS-1;
   if (pbuf->attached) {
      if (pbuf->buffer_header->client[x].unused1 != getpid()) {
         printf("unlock [%s] unused1 %d pid %d\n", pbuf->buffer_header->name, pbuf->buffer_header->client[x].unused1, getpid());
      }
      pbuf->buffer_header->client[x].unused1 = 0;
   } else {
      printf("unlock [??????] unused1 ????? pid %d\n", getpid());
   }
#endif
 
   // protect against double unlock
   assert(pbuf->locked);
   pbuf->locked = FALSE;
 
   ss_semaphore_release(pbuf->semaphore);
   pbuf->buffer_mutex.unlock();
}
 
#endif                          /* LOCAL_ROUTINES */
 
/********************************************************************/
INT bm_init_buffer_counters(INT buffer_handle)
/********************************************************************\
 
  Routine: bm_init_event_counters
 
  Purpose: Initialize counters for a specific buffer. This routine
           should be called at the beginning of a run.
 
  Input:
    INT    buffer_handle    Handle to the buffer to be
                            initialized.
  Output:
    none
 
  Function value:
    BM_SUCCESS              Successful completion
    BM_INVALID_HANDLE       Buffer handle is invalid
 
\********************************************************************/
{
   if (rpc_is_remote())
      return rpc_call(RPC_BM_INIT_BUFFER_COUNTERS, buffer_handle);
 
#ifdef LOCAL_ROUTINES
 
   int status = 0;
 
   BUFFER* pbuf = bm_get_buffer("bm_init_buffer_counters", buffer_handle, &status);
 
   if (!pbuf)
      return status;
 
   bm_lock_buffer_guard pbuf_guard(pbuf);
 
   if (!pbuf_guard.is_locked())
      return pbuf_guard.get_status();
 
   pbuf->buffer_header->num_in_events = 0;
   pbuf->buffer_header->num_out_events = 0;
 
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT bm_set_cache_size(INT buffer_handle, size_t read_size, size_t write_size)
/*------------------------------------------------------------------*/
{
   if (rpc_is_remote())
      return rpc_call(RPC_BM_SET_CACHE_SIZE, buffer_handle, read_size, write_size);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer("bm_set_cache_size", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      /* lock pbuf for local access. we do not lock buffer semaphore because we do not touch the shared memory */
 
      status = bm_lock_buffer_mutex(pbuf);
 
      if (status != BM_SUCCESS)
         return status;
 
      if (write_size < 0)
         write_size = 0;
 
      if (write_size > 0) {
         if (write_size < MIN_WRITE_CACHE_SIZE) {
            cm_msg(MERROR, "bm_set_cache_size", "requested write cache size %zu on buffer \"%s\" too small, will use minimum size %d", write_size, pbuf->buffer_name, MIN_WRITE_CACHE_SIZE);
            write_size = MIN_WRITE_CACHE_SIZE;
         }
      }
 
      size_t max_write_size = pbuf->buffer_header->size/MAX_WRITE_CACHE_SIZE_DIV;
 
      if (write_size > max_write_size) {
         size_t new_write_size = max_write_size;
         cm_msg(MERROR, "bm_set_cache_size", "requested write cache size %zu on buffer \"%s\" is too big: buffer size is %d, write cache size will be %zu bytes", write_size, pbuf->buffer_name, pbuf->buffer_header->size, new_write_size);
         write_size = new_write_size;
      }
 
      pbuf->buffer_mutex.unlock();
 
      /* resize read cache */
 
      status = bm_lock_buffer_read_cache(pbuf);
 
      if (status != BM_SUCCESS) {
         return status;
      }
 
      if (pbuf->read_cache_size > 0) {
         free(pbuf->read_cache);
         pbuf->read_cache = NULL;
      }
 
      if (read_size > 0) {
         pbuf->read_cache = (char *) malloc(read_size);
         if (pbuf->read_cache == NULL) {
            pbuf->read_cache_size = 0;
            pbuf->read_cache_rp = 0;
            pbuf->read_cache_wp = 0;
            pbuf->read_cache_mutex.unlock();
            cm_msg(MERROR, "bm_set_cache_size", "not enough memory to allocate read cache for buffer \"%s\", malloc(%zu) failed", pbuf->buffer_name, read_size);
            return BM_NO_MEMORY;
         }
      }
 
      pbuf->read_cache_size = read_size;
      pbuf->read_cache_rp = 0;
      pbuf->read_cache_wp = 0;
 
      pbuf->read_cache_mutex.unlock();
 
      /* resize the write cache */
 
      status = bm_lock_buffer_write_cache(pbuf);
 
      if (status != BM_SUCCESS)
         return status;
 
      // FIXME: should flush the write cache!
      if (pbuf->write_cache_size && pbuf->write_cache_wp > 0) {
         cm_msg(MERROR, "bm_set_cache_size", "buffer \"%s\" lost %zu bytes from the write cache", pbuf->buffer_name, pbuf->write_cache_wp);
      }
 
      /* manage write cache */
      if (pbuf->write_cache_size > 0) {
         free(pbuf->write_cache);
         pbuf->write_cache = NULL;
      }
 
      if (write_size > 0) {
         pbuf->write_cache = (char *) M_MALLOC(write_size);
         if (pbuf->write_cache == NULL) {
            pbuf->write_cache_size = 0;
            pbuf->write_cache_rp = 0;
            pbuf->write_cache_wp = 0;
            pbuf->write_cache_mutex.unlock();
            cm_msg(MERROR, "bm_set_cache_size", "not enough memory to allocate write cache for buffer \"%s\", malloc(%zu) failed", pbuf->buffer_name, write_size);
            return BM_NO_MEMORY;
         }
      }
 
      pbuf->write_cache_size = write_size;
      pbuf->write_cache_rp = 0;
      pbuf->write_cache_wp = 0;
 
      pbuf->write_cache_mutex.unlock();
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_compose_event(EVENT_HEADER *event_header, short int event_id, short int trigger_mask, DWORD data_size, DWORD serial)
{
   event_header->event_id = event_id;
   event_header->trigger_mask = trigger_mask;
   event_header->data_size = data_size;
   event_header->time_stamp = ss_time();
   event_header->serial_number = serial;
 
   return BM_SUCCESS;
}
 
INT bm_compose_event_threadsafe(EVENT_HEADER *event_header, short int event_id, short int trigger_mask, DWORD data_size, DWORD *serial)
{
   static std::mutex mutex;
 
   event_header->event_id = event_id;
   event_header->trigger_mask = trigger_mask;
   event_header->data_size = data_size;
   event_header->time_stamp = ss_time();
   {
      std::lock_guard<std::mutex> lock(mutex);
      event_header->serial_number = *serial;
      *serial = *serial + 1;
      // implicit unlock
   }
 
   return BM_SUCCESS;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT bm_add_event_request(INT buffer_handle, short int event_id,
                         short int trigger_mask,
                         INT sampling_type,
                         EVENT_HANDLER *func,
                         INT request_id)
/********************************************************************\
 
  Routine:  bm_add_event_request
 
  Purpose:  Place a request for a specific event type in the client
            structure of the buffer refereced by buffer_handle.
 
  Input:
    INT          buffer_handle  Handle to the buffer where the re-
                                quest should be placed in
 
    short int    event_id       Event ID      \
    short int    trigger_mask   Trigger mask  / Event specification
 
    INT          sampling_type  One of GET_ALL, GET_NONBLOCKING or GET_RECENT
 
 
                 Note: to request all types of events, use
                   event_id = 0 (all others should be !=0 !)
                   trigger_mask = TRIGGER_ALL
                   sampling_typ = GET_ALL
 
 
    void         *func          Callback function
    INT          request_id     Request id (unique number assigned
                                by bm_request_event)
 
  Output:
    none
 
  Function value:
    BM_SUCCESS              Successful completion
    BM_NO_MEMORY            Too much request. MAX_EVENT_REQUESTS in
                            MIDAS.H should be increased.
    BM_INVALID_HANDLE       Buffer handle is invalid
    BM_INVALID_PARAM        GET_RECENT is used with non-zero cache size
    RPC_NET_ERROR           Network error
 
\********************************************************************/
{
   if (rpc_is_remote())
      return rpc_call(RPC_BM_ADD_EVENT_REQUEST, buffer_handle, event_id,
                      trigger_mask, sampling_type, (INT) (POINTER_T) func, request_id);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer("bm_add_event_request", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      /* lock buffer */
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked())
         return pbuf_guard.get_status();
 
      /* avoid callback/non callback requests */
      if (func == NULL && pbuf->callback) {
         pbuf_guard.unlock(); // unlock before cm_msg()
         cm_msg(MERROR, "bm_add_event_request", "mixing callback/non callback requests not possible");
         return BM_INVALID_MIXING;
      }
 
      /* do not allow GET_RECENT with nonzero cache size */
      if (sampling_type == GET_RECENT && pbuf->read_cache_size > 0) {
         pbuf_guard.unlock(); // unlock before cm_msg()
         cm_msg(MERROR, "bm_add_event_request", "GET_RECENT request not possible if read cache is enabled");
         return BM_INVALID_PARAM;
      }
 
      /* get a pointer to the proper client structure */
      BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
 
      /* look for a empty request entry */
      int i;
      for (i = 0; i < MAX_EVENT_REQUESTS; i++)
         if (!pclient->event_request[i].valid)
            break;
 
      if (i == MAX_EVENT_REQUESTS) {
         // implicit unlock
         return BM_NO_MEMORY;
      }
 
      /* setup event_request structure */
      pclient->event_request[i].id = request_id;
      pclient->event_request[i].valid = TRUE;
      pclient->event_request[i].event_id = event_id;
      pclient->event_request[i].trigger_mask = trigger_mask;
      pclient->event_request[i].sampling_type = sampling_type;
 
      pclient->all_flag = pclient->all_flag || (sampling_type & GET_ALL);
 
      pbuf->get_all_flag = pclient->all_flag;
 
      /* set callback flag in buffer structure */
      if (func != NULL)
         pbuf->callback = TRUE;
 
      /*
         Save the index of the last request in the list so that later only the
         requests 0..max_request_index-1 have to be searched through.
       */
 
      if (i + 1 > pclient->max_request_index)
         pclient->max_request_index = i + 1;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT bm_request_event(HNDLE buffer_handle, short int event_id,
                     short int trigger_mask,
                     INT sampling_type, HNDLE *request_id,
                     EVENT_HANDLER *func)
{
   assert(request_id != NULL);
   
   EventRequest r;
   r.buffer_handle = buffer_handle;
   r.event_id      = event_id;
   r.trigger_mask  = trigger_mask;
   r.dispatcher    = func;
 
   {
      std::lock_guard<std::mutex> guard(_request_list_mutex);
   
      bool found = false;
      
      // find deleted entry
      for (size_t i = 0; i < _request_list.size(); i++) {
         if (_request_list[i].buffer_handle == 0) {
            _request_list[i] = r;
            *request_id = i;
            found = true;
            break;
         }
      }
      
      if (!found) { // not found
         *request_id = _request_list.size();
         _request_list.push_back(r);
      }
 
      // implicit unlock()
   }
 
   /* add request in buffer structure */
   int status = bm_add_event_request(buffer_handle, event_id, trigger_mask, sampling_type, func, *request_id);
   if (status != BM_SUCCESS)
      return status;
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_remove_event_request(INT buffer_handle, INT request_id) {
   if (rpc_is_remote())
      return rpc_call(RPC_BM_REMOVE_EVENT_REQUEST, buffer_handle, request_id);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer("bm_remove_event_request", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      /* lock buffer */
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked())
         return pbuf_guard.get_status();
 
      INT i, deleted;
 
      /* get a pointer to the proper client structure */
      BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
 
      /* check all requests and set to zero if matching */
      for (i = 0, deleted = 0; i < pclient->max_request_index; i++)
         if (pclient->event_request[i].valid && pclient->event_request[i].id == request_id) {
            memset(&pclient->event_request[i], 0, sizeof(EVENT_REQUEST));
            deleted++;
         }
 
      /* calculate new max_request_index entry */
      for (i = MAX_EVENT_REQUESTS - 1; i >= 0; i--)
         if (pclient->event_request[i].valid)
            break;
 
      pclient->max_request_index = i + 1;
 
      /* calculate new all_flag */
      pclient->all_flag = FALSE;
 
      for (i = 0; i < pclient->max_request_index; i++)
         if (pclient->event_request[i].valid && (pclient->event_request[i].sampling_type & GET_ALL)) {
            pclient->all_flag = TRUE;
            break;
         }
 
      pbuf->get_all_flag = pclient->all_flag;
 
      if (!deleted)
         return BM_NOT_FOUND;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_delete_request(INT request_id)
{
   _request_list_mutex.lock();
   
   if (request_id < 0 || size_t(request_id) >= _request_list.size()) {
      _request_list_mutex.unlock();
      return BM_INVALID_HANDLE;
   }
 
   int buffer_handle = _request_list[request_id].buffer_handle;
 
   _request_list[request_id].clear();
 
   _request_list_mutex.unlock();
 
   /* remove request entry from buffer */
   return bm_remove_event_request(buffer_handle, request_id);
}
 
#if 0                           // currently not used
static void bm_show_pointers(const BUFFER_HEADER * pheader)
{
   int i;
   const BUFFER_CLIENT *pclient;
 
   pclient = pheader->client;
 
   printf("buffer \'%s\', rptr: %d, wptr: %d, size: %d\n", pheader->name, pheader->read_pointer,
          pheader->write_pointer, pheader->size);
   for (i = 0; i < pheader->max_client_index; i++)
      if (pclient[i].pid) {
         printf("pointers: client %d \'%s\', rptr %d\n", i, pclient[i].name, pclient[i].read_pointer);
      }
 
   printf("done\n");
}
#endif
 
static void bm_validate_client_pointers_locked(const BUFFER_HEADER *pheader, BUFFER_CLIENT *pclient) {
   assert(pheader->read_pointer >= 0 && pheader->read_pointer <= pheader->size);
   assert(pclient->read_pointer >= 0 && pclient->read_pointer <= pheader->size);
 
   if (pheader->read_pointer <= pheader->write_pointer) {
 
      if (pclient->read_pointer < pheader->read_pointer) {
         cm_msg(MINFO, "bm_validate_client_pointers",
                "Corrected read pointer for client \'%s\' on buffer \'%s\' from %d to %d, write pointer %d, size %d",
                pclient->name,
                pheader->name, pclient->read_pointer, pheader->read_pointer, pheader->write_pointer, pheader->size);
 
         pclient->read_pointer = pheader->read_pointer;
      }
 
      if (pclient->read_pointer > pheader->write_pointer) {
         cm_msg(MINFO, "bm_validate_client_pointers",
                "Corrected read pointer for client \'%s\' on buffer \'%s\' from %d to %d, read pointer %d, size %d",
                pclient->name,
                pheader->name, pclient->read_pointer, pheader->write_pointer, pheader->read_pointer, pheader->size);
 
         pclient->read_pointer = pheader->write_pointer;
      }
 
   } else {
 
      if (pclient->read_pointer < 0) {
         cm_msg(MINFO, "bm_validate_client_pointers",
                "Corrected read pointer for client \'%s\' on buffer \'%s\' from %d to %d, write pointer %d, size %d",
                pclient->name,
                pheader->name, pclient->read_pointer, pheader->read_pointer, pheader->write_pointer, pheader->size);
 
         pclient->read_pointer = pheader->read_pointer;
      }
 
      if (pclient->read_pointer >= pheader->size) {
         cm_msg(MINFO, "bm_validate_client_pointers",
                "Corrected read pointer for client \'%s\' on buffer \'%s\' from %d to %d, write pointer %d, size %d",
                pclient->name,
                pheader->name, pclient->read_pointer, pheader->read_pointer, pheader->write_pointer, pheader->size);
 
         pclient->read_pointer = pheader->read_pointer;
      }
 
      if (pclient->read_pointer > pheader->write_pointer && pclient->read_pointer < pheader->read_pointer) {
         cm_msg(MINFO, "bm_validate_client_pointers",
                "Corrected read pointer for client \'%s\' on buffer \'%s\' from %d to %d, write pointer %d, size %d",
                pclient->name,
                pheader->name, pclient->read_pointer, pheader->read_pointer, pheader->write_pointer, pheader->size);
 
         pclient->read_pointer = pheader->read_pointer;
      }
   }
}
 
#if 0                           // currently not used
static void bm_validate_pointers(BUFFER_HEADER * pheader)
{
   BUFFER_CLIENT *pclient = pheader->client;
   int i;
 
   for (i = 0; i < pheader->max_client_index; i++)
      if (pclient[i].pid) {
         bm_validate_client_pointers(pheader, &pclient[i]);
      }
}
#endif
 
//
// Buffer pointers
//
// normal:
//
// zero -->
// ... free space
// read_pointer -->
// client1 rp -->
// client2 rp -->
// ... buffered data
// write_pointer -->
// ... free space
// pheader->size -->
//
// inverted:
//
// zero -->
// client3 rp -->
// ... buffered data
// client4 rp -->
// write_pointer -->
// ... free space
// read_pointer -->
// client1 rp -->
// client2 rp -->
// ... buffered data
// pheader->size -->
//
 
static BOOL bm_update_read_pointer_locked(const char *caller_name, BUFFER_HEADER *pheader) {
   assert(caller_name);
 
   /* calculate global read pointer as "minimum" of client read pointers */
   int min_rp = pheader->write_pointer;
 
   int i;
   for (i = 0; i < pheader->max_client_index; i++) {
      BUFFER_CLIENT *pc = pheader->client + i;
      if (pc->pid) {
         bm_validate_client_pointers_locked(pheader, pc);
 
#if 0
         printf("bm_update_read_pointer: [%s] rp %d, wp %d, size %d, min_rp %d, client [%s] rp %d\n",
                pheader->name,
                pheader->read_pointer,
                pheader->write_pointer,
                pheader->size,
                min_rp,
                pc->name,
                pc->read_pointer);
#endif
 
         if (pheader->read_pointer <= pheader->write_pointer) {
            // normal pointers
            if (pc->read_pointer < min_rp)
               min_rp = pc->read_pointer;
         } else {
            // inverted pointers
            if (pc->read_pointer <= pheader->write_pointer) {
               // clients 3 and 4
               if (pc->read_pointer < min_rp)
                  min_rp = pc->read_pointer;
            } else {
               // clients 1 and 2
               int xptr = pc->read_pointer - pheader->size;
               if (xptr < min_rp)
                  min_rp = xptr;
            }
         }
      }
   }
 
   if (min_rp < 0)
      min_rp += pheader->size;
 
   assert(min_rp >= 0);
   assert(min_rp < pheader->size);
 
   if (min_rp == pheader->read_pointer) {
      return FALSE;
   }
 
#if 0
   printf("bm_update_read_pointer: [%s] rp %d, wp %d, size %d, new_rp %d, moved\n",
          pheader->name,
          pheader->read_pointer,
          pheader->write_pointer,
          pheader->size,
          min_rp);
#endif
 
   pheader->read_pointer = min_rp;
 
   return TRUE;
}
 
static void bm_wakeup_producers_locked(const BUFFER_HEADER *pheader, const BUFFER_CLIENT *pc) {
   int i;
   int have_get_all_requests = 0;
 
   for (i = 0; i < pc->max_request_index; i++)
      if (pc->event_request[i].valid)
         have_get_all_requests |= (pc->event_request[i].sampling_type == GET_ALL);
 
   /* only GET_ALL requests actually free space in the event buffer */
   if (!have_get_all_requests)
      return;
 
   /*
      If read pointer has been changed, it may have freed up some space
      for waiting producers. So check if free space is now more than 50%
      of the buffer size and wake waiting producers.
    */
 
   int free_space = pc->read_pointer - pheader->write_pointer;
   if (free_space <= 0)
      free_space += pheader->size;
 
   if (free_space >= pheader->size * 0.5) {
      for (i = 0; i < pheader->max_client_index; i++) {
         const BUFFER_CLIENT *pc = pheader->client + i;
         if (pc->pid && pc->write_wait) {
            BOOL send_wakeup = (pc->write_wait < free_space);
            //printf("bm_wakeup_producers: buffer [%s] client [%s] write_wait %d, free_space %d, sending wakeup message %d\n", pheader->name, pc->name, pc->write_wait, free_space, send_wakeup);
            if (send_wakeup) {
               ss_resume(pc->port, "B  ");
            }
         }
      }
   }
}
 
static void bm_dispatch_event(int buffer_handle, EVENT_HEADER *pevent)
{
   _request_list_mutex.lock();
   bool locked = true;
   size_t n = _request_list.size();
   /* call dispatcher */
   for (size_t i = 0; i < n; i++) {
      if (!locked) {
         _request_list_mutex.lock();
         locked = true;
      }
      EventRequest r = _request_list[i];
      if (r.buffer_handle != buffer_handle)
         continue;
      if (!bm_match_event(r.event_id, r.trigger_mask, pevent))
         continue;
      /* must release the lock on the request list: user provided r.dispatcher() can add or remove event requests, and we will deadlock. K.O. */
      _request_list_mutex.unlock();
      locked = false;
      /* if event is fragmented, call defragmenter */
      if (((uint16_t(pevent->event_id) & uint16_t(0xF000)) == uint16_t(EVENTID_FRAG1)) || ((uint16_t(pevent->event_id) & uint16_t(0xF000)) == uint16_t(EVENTID_FRAG))) {
         bm_defragment_event(buffer_handle, i, pevent, (void *) (pevent + 1), r.dispatcher);
      } else {
         r.dispatcher(buffer_handle, i, pevent, (void *) (pevent + 1));
      }
   }
   if (locked)
      _request_list_mutex.unlock();
}
 
#ifdef LOCAL_ROUTINES
 
static void bm_incr_read_cache_locked(BUFFER *pbuf, int total_size) {
   /* increment read cache read pointer */
   pbuf->read_cache_rp += total_size;
 
   if (pbuf->read_cache_rp == pbuf->read_cache_wp) {
      pbuf->read_cache_rp = 0;
      pbuf->read_cache_wp = 0;
   }
}
 
static BOOL bm_peek_read_cache_locked(BUFFER *pbuf, EVENT_HEADER **ppevent, int *pevent_size, int *ptotal_size)
{
   if (pbuf->read_cache_rp == pbuf->read_cache_wp)
      return FALSE;
 
   EVENT_HEADER *pevent = (EVENT_HEADER *) (pbuf->read_cache + pbuf->read_cache_rp);
   int event_size = pevent->data_size + sizeof(EVENT_HEADER);
   int total_size = ALIGN8(event_size);
 
   if (ppevent)
      *ppevent = pevent;
   if (pevent_size)
      *pevent_size = event_size;
   if (ptotal_size)
      *ptotal_size = total_size;
 
   return TRUE;
}
 
//
// return values:
// BM_SUCCESS - have an event, fill ppevent, ppevent_size & co
// BM_ASYNC_RETURN - buffer is empty
// BM_CORRUPTED - buffer is corrupted
//
 
static int bm_peek_buffer_locked(BUFFER *pbuf, BUFFER_HEADER *pheader, BUFFER_CLIENT *pc, EVENT_HEADER **ppevent, int *pevent_size, int *ptotal_size)
{
   if (pc->read_pointer == pheader->write_pointer) {
      /* no more events buffered for this client */
      if (!pc->read_wait) {
         //printf("bm_peek_buffer_locked: buffer [%s] client [%s], set read_wait!\n", pheader->name, pc->name);
         pc->read_wait = TRUE;
      }
      return BM_ASYNC_RETURN;
   }
 
   if (pc->read_wait) {
      //printf("bm_peek_buffer_locked: buffer [%s] client [%s], clear read_wait!\n", pheader->name, pc->name);
      pc->read_wait = FALSE;
   }
 
   if ((pc->read_pointer < 0) || (pc->read_pointer >= pheader->size)) {
      cm_msg(MERROR, "bm_peek_buffer_locked", "event buffer \"%s\" is corrupted: client \"%s\" read pointer %d is invalid. buffer read pointer %d, write pointer %d, size %d", pheader->name, pc->name, pc->read_pointer, pheader->read_pointer, pheader->write_pointer, pheader->size);
      return BM_CORRUPTED;
   }
 
   char *pdata = (char *) (pheader + 1);
 
   EVENT_HEADER *pevent = (EVENT_HEADER *) (pdata + pc->read_pointer);
   int event_size = pevent->data_size + sizeof(EVENT_HEADER);
   int total_size = ALIGN8(event_size);
 
   if ((total_size <= 0) || (total_size > pheader->size)) {
      cm_msg(MERROR, "bm_peek_buffer_locked", "event buffer \"%s\" is corrupted: client \"%s\" read pointer %d points to invalid event: data_size %d, event_size %d, total_size %d. buffer size: %d, read_pointer: %d, write_pointer: %d", pheader->name, pc->name, pc->read_pointer, pevent->data_size, event_size, total_size, pheader->size, pheader->read_pointer, pheader->write_pointer);
      return BM_CORRUPTED;
   }
 
   assert(total_size > 0);
   assert(total_size <= pheader->size);
 
   if (ppevent)
      *ppevent = pevent;
   if (pevent_size)
      *pevent_size = event_size;
   if (ptotal_size)
      *ptotal_size = total_size;
 
   return BM_SUCCESS;
}
 
static void bm_read_from_buffer_locked(const BUFFER_HEADER *pheader, int rp, char *buf, int event_size)
{
   const char *pdata = (const char *) (pheader + 1);
 
   if (rp + event_size <= pheader->size) {
      /* copy event to cache */
      memcpy(buf, pdata + rp, event_size);
   } else {
      /* event is splitted */
      int size = pheader->size - rp;
      memcpy(buf, pdata + rp, size);
      memcpy(buf + size, pdata, event_size - size);
   }
}
 
static void bm_read_from_buffer_locked(const BUFFER_HEADER *pheader, int rp, std::vector<char> *vecptr, int event_size)
{
   const char *pdata = (const char *) (pheader + 1);
 
   if (rp + event_size <= pheader->size) {
      /* copy event to cache */
      vecptr->assign(pdata + rp, pdata + rp + event_size);
   } else {
      /* event is splitted */
      int size = pheader->size - rp;
      vecptr->assign(pdata + rp, pdata + rp + size);
      vecptr->insert(vecptr->end(), pdata, pdata + event_size - size);
   }
}
 
static BOOL bm_check_requests(const BUFFER_CLIENT *pc, const EVENT_HEADER *pevent) {
 
   BOOL is_requested = FALSE;
   int i;
   for (i = 0; i < pc->max_request_index; i++) {
      const EVENT_REQUEST *prequest = pc->event_request + i;
      if (prequest->valid) {
         if (bm_match_event(prequest->event_id, prequest->trigger_mask, pevent)) {
            /* check if this is a recent event */
            if (prequest->sampling_type == GET_RECENT) {
               if (ss_time() - pevent->time_stamp > 1) {
                  /* skip that event */
                  continue;
               }
            }
 
            is_requested = TRUE;
            break;
         }
      }
   }
   return is_requested;
}
 
static int bm_wait_for_more_events_locked(bm_lock_buffer_guard& pbuf_guard, BUFFER_CLIENT *pc, int timeout_msec, BOOL unlock_read_cache);
 
static int bm_fill_read_cache_locked(bm_lock_buffer_guard& pbuf_guard, int timeout_msec)
{
   BUFFER* pbuf = pbuf_guard.get_pbuf();
   BUFFER_HEADER* pheader = pbuf->buffer_header;
   BUFFER_CLIENT *pc = bm_get_my_client_locked(pbuf_guard);
   BOOL need_wakeup = FALSE;
 
   //printf("bm_fill_read_cache: [%s] timeout %d, size %d, rp %d, wp %d\n", pheader->name, timeout_msec, pbuf->read_cache_size, pbuf->read_cache_rp, pbuf->read_cache_wp);
 
   /* loop over all events in the buffer */
 
   while (1) {
      EVENT_HEADER *pevent = NULL;
      int event_size = 3; // poison value
      int total_size = 3; // poison value
 
      int status = bm_peek_buffer_locked(pbuf, pheader, pc, &pevent, &event_size, &total_size);
      if (status == BM_CORRUPTED) {
         return status;
      } else if (status != BM_SUCCESS) {
         /* event buffer is empty */
         if (timeout_msec == BM_NO_WAIT) {
            if (need_wakeup)
               bm_wakeup_producers_locked(pheader, pc);
            if (pbuf->read_cache_rp == pbuf->read_cache_wp) {
               // read cache is empty
               return BM_ASYNC_RETURN;
            }
            return BM_SUCCESS;
         }
 
         int status = bm_wait_for_more_events_locked(pbuf_guard, pc, timeout_msec, TRUE);
 
         if (status != BM_SUCCESS) {
            // we only come here with SS_ABORT & co
            return status;
         }
 
         // make sure we wait for new event only once
         timeout_msec = BM_NO_WAIT;
         // go back to bm_peek_buffer_locked
         continue;
      }
 
      /* loop over all requests: if this event matches a request,
       * copy it to the read cache */
 
      BOOL is_requested = bm_check_requests(pc, pevent);
 
      if (is_requested) {
         if (pbuf->read_cache_wp + total_size > pbuf->read_cache_size) {
            /* read cache is full */
            if (need_wakeup)
               bm_wakeup_producers_locked(pheader, pc);
            return BM_SUCCESS;
         }
 
         bm_read_from_buffer_locked(pheader, pc->read_pointer, pbuf->read_cache + pbuf->read_cache_wp, event_size);
 
         pbuf->read_cache_wp += total_size;
 
         /* update statistics */
         pheader->num_out_events++;
         pbuf->count_read++;
         pbuf->bytes_read += event_size;
      }
 
      /* shift read pointer */
 
      int new_read_pointer = bm_incr_rp_no_check(pheader, pc->read_pointer, total_size);
      pc->read_pointer = new_read_pointer;
 
      need_wakeup = TRUE;
   }
   /* NOT REACHED */
}
 
static void bm_convert_event_header(EVENT_HEADER *pevent, int convert_flags) {
   /* now convert event header */
   if (convert_flags) {
      rpc_convert_single(&pevent->event_id, TID_INT16, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&pevent->trigger_mask, TID_INT16, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&pevent->serial_number, TID_UINT32, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&pevent->time_stamp, TID_UINT32, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&pevent->data_size, TID_UINT32, RPC_OUTGOING, convert_flags);
   }
}
 
static int bm_wait_for_free_space_locked(bm_lock_buffer_guard& pbuf_guard, int timeout_msec, int requested_space, bool unlock_write_cache)
{
   // return values:
   // BM_SUCCESS - have "requested_space" bytes free in the buffer
   // BM_CORRUPTED - shared memory is corrupted
   // BM_NO_MEMORY - asked for more than buffer size
   // BM_ASYNC_RETURN - timeout waiting for free space
   // BM_INVALID_HANDLE - buffer was closed (locks released) (via bm_clock_xxx())
   // SS_ABORT - we are told to shutdown (locks releases)
 
   int status;
   BUFFER* pbuf = pbuf_guard.get_pbuf();
   BUFFER_HEADER *pheader = pbuf->buffer_header;
   char *pdata = (char *) (pheader + 1);
 
   /* make sure the buffer never completely full:
    * read pointer and write pointer would coincide
    * and the code cannot tell if it means the
    * buffer is 100% full or 100% empty. It will explode
    * or lose events */
   requested_space += 100;
 
   if (requested_space >= pheader->size)
      return BM_NO_MEMORY;
 
   DWORD time_start = ss_millitime();
   DWORD time_end = time_start + timeout_msec;
 
   //DWORD blocking_time = 0;
   //int blocking_loops = 0;
   int blocking_client_index = -1;
   char blocking_client_name[NAME_LENGTH];
   blocking_client_name[0] = 0;
 
   while (1) {
      while (1) {
         /* check if enough space in buffer */
 
         int free = pheader->read_pointer - pheader->write_pointer;
         if (free <= 0)
            free += pheader->size;
 
         //printf("bm_wait_for_free_space: buffer pointers: read: %d, write: %d, free space: %d, bufsize: %d, event size: %d, timeout %d\n", pheader->read_pointer, pheader->write_pointer, free, pheader->size, requested_space, timeout_msec);
 
         if (requested_space < free) { /* note the '<' to avoid 100% filling */
            //if (blocking_loops) {
            //   DWORD wait_time = ss_millitime() - blocking_time;
            //   printf("blocking client \"%s\", time %d ms, loops %d\n", blocking_client_name, wait_time, blocking_loops);
            //}
 
            if (pbuf->wait_start_time != 0) {
               DWORD now = ss_millitime();
               DWORD wait_time = now - pbuf->wait_start_time;
               pbuf->time_write_wait += wait_time;
               pbuf->wait_start_time = 0;
               int iclient = pbuf->wait_client_index;
               //printf("bm_wait_for_free_space: wait ended: wait time %d ms, blocking client index %d\n", wait_time, iclient);
               if (iclient >= 0 && iclient < MAX_CLIENTS) {
                  pbuf->client_count_write_wait[iclient] += 1;
                  pbuf->client_time_write_wait[iclient] += wait_time;
               }
            }
 
            //if (blocking_loops > 0) {
            //   printf("bm_wait_for_free_space: buffer pointers: read: %d, write: %d, free space: %d, bufsize: %d, event size: %d, timeout %d, found space after %d waits\n", pheader->read_pointer, pheader->write_pointer, free, pheader->size, requested_space, timeout_msec, blocking_loops);
            //}
 
            return BM_SUCCESS;
         }
 
         if (!bm_validate_rp("bm_wait_for_free_space_locked", pheader, pheader->read_pointer)) {
            cm_msg(MERROR, "bm_wait_for_free_space",
                   "error: buffer \"%s\" is corrupted: read_pointer %d, write_pointer %d, size %d, free %d, waiting for %d bytes: read pointer is invalid",
                   pheader->name,
                   pheader->read_pointer,
                   pheader->write_pointer,
                   pheader->size,
                   free,
                   requested_space);
            return BM_CORRUPTED;
         }
 
         const EVENT_HEADER *pevent = (const EVENT_HEADER *) (pdata + pheader->read_pointer);
         int event_size = pevent->data_size + sizeof(EVENT_HEADER);
         int total_size = ALIGN8(event_size);
 
#if 0
         printf("bm_wait_for_free_space: buffer pointers: read: %d, write: %d, free space: %d, bufsize: %d, event size: %d, blocking event size %d/%d\n", pheader->read_pointer, pheader->write_pointer, free, pheader->size, requested_space, event_size, total_size);
#endif
 
         if (pevent->data_size <= 0 || total_size <= 0 || total_size > pheader->size) {
            cm_msg(MERROR, "bm_wait_for_free_space",
                   "error: buffer \"%s\" is corrupted: read_pointer %d, write_pointer %d, size %d, free %d, waiting for %d bytes: read pointer points to an invalid event: data_size %d, event size %d, total_size %d",
                   pheader->name,
                   pheader->read_pointer,
                   pheader->write_pointer,
                   pheader->size,
                   free,
                   requested_space,
                   pevent->data_size,
                   event_size,
                   total_size);
            return BM_CORRUPTED;
         }
 
         int blocking_client = -1;
 
         int i;
         for (i = 0; i < pheader->max_client_index; i++) {
            BUFFER_CLIENT *pc = pheader->client + i;
            if (pc->pid) {
               if (pc->read_pointer == pheader->read_pointer) {
                  /*
                    First assume that the client with the "minimum" read pointer
                    is not really blocking due to a GET_ALL request.
                  */
                  BOOL blocking = FALSE;
                  //int blocking_request_id = -1;
 
                  int j;
                  for (j = 0; j < pc->max_request_index; j++) {
                     const EVENT_REQUEST *prequest = pc->event_request + j;
                     if (prequest->valid
                         && bm_match_event(prequest->event_id, prequest->trigger_mask, pevent)) {
                        if (prequest->sampling_type & GET_ALL) {
                           blocking = TRUE;
                           //blocking_request_id = prequest->id;
                           break;
                        }
                     }
                  }
 
                  //printf("client [%s] blocking %d, request %d\n", pc->name, blocking, blocking_request_id);
 
                  if (blocking) {
                     blocking_client = i;
                     break;
                  }
 
                  pc->read_pointer = bm_incr_rp_no_check(pheader, pc->read_pointer, total_size);
               }
            }
         } /* client loop */
 
         if (blocking_client >= 0) {
            blocking_client_index = blocking_client;
            mstrlcpy(blocking_client_name, pheader->client[blocking_client].name, sizeof(blocking_client_name));
            //if (!blocking_time) {
            //   blocking_time = ss_millitime();
            //}
 
            //printf("bm_wait_for_free_space: buffer pointers: read: %d, write: %d, free space: %d, bufsize: %d, event size: %d, timeout %d, must wait for more space!\n", pheader->read_pointer, pheader->write_pointer, free, pheader->size, requested_space, timeout_msec);
 
            // from this "break" we go into timeout check and sleep/wait.
            break;
         }
 
         /* no blocking clients. move the read pointer and again check for free space */
 
         BOOL moved = bm_update_read_pointer_locked("bm_wait_for_free_space", pheader);
 
         if (!moved) {
            cm_msg(MERROR, "bm_wait_for_free_space",
                   "error: buffer \"%s\" is corrupted: read_pointer %d, write_pointer %d, size %d, free %d, waiting for %d bytes: read pointer did not move as expected",
                   pheader->name,
                   pheader->read_pointer,
                   pheader->write_pointer,
                   pheader->size,
                   free,
                   requested_space);
            return BM_CORRUPTED;
         }
 
         /* we freed one event, loop back to the check for free space */
      }
 
      //blocking_loops++;
 
      /* at least one client is blocking */
 
      BUFFER_CLIENT *pc = bm_get_my_client_locked(pbuf_guard);
      pc->write_wait = requested_space;
 
      if (pbuf->wait_start_time == 0) {
         pbuf->wait_start_time = ss_millitime();
         pbuf->count_write_wait++;
         if (requested_space > pbuf->max_requested_space)
            pbuf->max_requested_space = requested_space;
         pbuf->wait_client_index = blocking_client_index;
      }
 
      DWORD now = ss_millitime();
 
      //printf("bm_wait_for_free_space: start 0x%08x, now 0x%08x, end 0x%08x, timeout %d, wait %d\n", time_start, now, time_end, timeout_msec, time_end - now);
 
      int sleep_time_msec = 1000;
 
      if (timeout_msec == BM_WAIT) {
         // wait forever
      } else if (timeout_msec == BM_NO_WAIT) {
         // no wait
         return BM_ASYNC_RETURN;
      } else {
         // check timeout
         if (now >= time_end) {
            // timeout!
            return BM_ASYNC_RETURN;
         }
 
         sleep_time_msec = time_end - now;
 
         if (sleep_time_msec <= 0) {
            sleep_time_msec = 10;
         } else if (sleep_time_msec > 1000) {
            sleep_time_msec = 1000;
         }
      }
 
      ss_suspend_get_buffer_port(ss_gettid(), &pc->port);
 
      /* before waiting, unlock everything in the correct order */
 
      pbuf_guard.unlock();
 
      if (unlock_write_cache)
         pbuf->write_cache_mutex.unlock();
 
      //printf("bm_wait_for_free_space: blocking client \"%s\"\n", blocking_client_name);
 
#ifdef DEBUG_MSG
      cm_msg(MDEBUG, "Send sleep: rp=%d, wp=%d, level=%1.1lf", pheader->read_pointer, pheader->write_pointer, 100 - 100.0 * size / pheader->size);
#endif
 
      //int idx = bm_validate_client_index_locked(pbuf, FALSE);
      //if (idx >= 0)
      //   pheader->client[idx].write_wait = requested_space;
 
      //bm_cleanup("bm_wait_for_free_space", ss_millitime(), FALSE);
 
      status = ss_suspend(sleep_time_msec, MSG_BM);
 
      /* we are told to shutdown */
      if (status == SS_ABORT) {
         // NB: buffer is locked!
         return SS_ABORT;
      }
 
      /* make sure we do sleep in this loop:
       * if we are the mserver receiving data on the event
       * socket and the data buffer is full, ss_suspend() will
       * never sleep: it will detect data on the event channel,
       * call rpc_server_receive() (recursively, we already *are* in
       * rpc_server_receive()) and return without sleeping. Result
       * is a busy loop waiting for free space in data buffer */
 
      /* update May 2021: ss_suspend(MSG_BM) no longer looks at
       * the event socket, and should sleep now, so this sleep below
       * maybe is not needed now. but for safety, I keep it. K.O. */
 
      if (status != SS_TIMEOUT) {
         //printf("ss_suspend: status %d\n", status);
         ss_sleep(1);
      }
 
      /* we may be stuck in this loop for an arbitrary long time,
       * depending on how other buffer clients read the accumulated data
       * so we should update all the timeouts & etc. K.O. */
 
      cm_periodic_tasks();
 
      /* lock things again in the correct order */
 
      if (unlock_write_cache) {
         status = bm_lock_buffer_write_cache(pbuf);
 
         if (status != BM_SUCCESS) {
            // bail out with all locks released
            return status;
         }
      }
 
      if (!pbuf_guard.relock()) {
         if (unlock_write_cache) {
            pbuf->write_cache_mutex.unlock();
         }
 
         // bail out with all locks released
         return pbuf_guard.get_status();
      }
 
      /* revalidate the client index: we could have been removed from the buffer while sleeping */
      pc = bm_get_my_client_locked(pbuf_guard);
 
      pc->write_wait = 0;
 
      //idx = bm_validate_client_index_locked(pbuf, FALSE);
      //if (idx >= 0)
      //   pheader->client[idx].write_wait = 0;
      //else {
      //   cm_msg(MERROR, "bm_wait_for_free_space", "our client index is no longer valid, exiting...");
      //   status = SS_ABORT;
      //}
 
#ifdef DEBUG_MSG
      cm_msg(MDEBUG, "Send woke up: rp=%d, wp=%d, level=%1.1lf", pheader->read_pointer, pheader->write_pointer, 100 - 100.0 * size / pheader->size);
#endif
 
   }
}
 
static int bm_wait_for_more_events_locked(bm_lock_buffer_guard& pbuf_guard, BUFFER_CLIENT *pc, int timeout_msec, BOOL unlock_read_cache)
{
   BUFFER* pbuf = pbuf_guard.get_pbuf();
   BUFFER_HEADER* pheader = pbuf->buffer_header;
   
   //printf("bm_wait_for_more_events_locked: [%s] timeout %d\n", pheader->name, timeout_msec);
   
   if (pc->read_pointer != pheader->write_pointer) {
      // buffer has data
      return BM_SUCCESS;
   }
 
   if (timeout_msec == BM_NO_WAIT) {
      /* event buffer is empty and we are told to not wait */
      if (!pc->read_wait) {
         //printf("bm_wait_for_more_events: buffer [%s] client [%s] set read_wait in BM_NO_WAIT!\n", pheader->name, pc->name);
         pc->read_wait = TRUE;
      }
      return BM_ASYNC_RETURN;
   }
 
   DWORD time_start = ss_millitime();
   DWORD time_wait  = time_start + timeout_msec;
   DWORD sleep_time = 1000;
   if (timeout_msec == BM_NO_WAIT) {
      // default sleep time
   } else if (timeout_msec == BM_WAIT) {
      // default sleep time
   } else {
      if (sleep_time > (DWORD)timeout_msec)
         sleep_time = timeout_msec;
   }
 
   //printf("time start 0x%08x, end 0x%08x, sleep %d\n", time_start, time_wait, sleep_time);
 
   while (pc->read_pointer == pheader->write_pointer) {
      /* wait until there is data in the buffer (write pointer moves) */
 
      if (!pc->read_wait) {
         //printf("bm_wait_for_more_events: buffer [%s] client [%s] set read_wait!\n", pheader->name, pc->name);
         pc->read_wait = TRUE;
      }
 
      pc->last_activity = ss_millitime();
 
      ss_suspend_get_buffer_port(ss_gettid(), &pc->port);
 
      // NB: locking order is: 1st read cache lock, 2nd buffer lock, unlock in reverse order
 
      pbuf_guard.unlock();
 
      if (unlock_read_cache)
         pbuf->read_cache_mutex.unlock();
 
      int status = ss_suspend(sleep_time, MSG_BM);
 
      if (timeout_msec == BM_NO_WAIT) {
         // return immediately
      } else if (timeout_msec == BM_WAIT) {
         // wait forever
      } else {
         DWORD now = ss_millitime();
         //printf("check timeout: now 0x%08x, end 0x%08x, diff %d\n", now, time_wait, time_wait - now);
         if (now >= time_wait) {
            timeout_msec = BM_NO_WAIT; // cause immediate return
         } else {
            sleep_time = time_wait - now;
            if (sleep_time > 1000)
               sleep_time = 1000;
            //printf("time start 0x%08x, now 0x%08x, end 0x%08x, sleep %d\n", time_start, now, time_wait, sleep_time);
         }
      }
 
      // NB: locking order is: 1st read cache lock, 2nd buffer lock, unlock in reverse order
 
      if (unlock_read_cache) {
         status = bm_lock_buffer_read_cache(pbuf);
         if (status != BM_SUCCESS) {
            // bail out with all locks released
            return status;
         }
      }
 
      if (!pbuf_guard.relock()) {
         if (unlock_read_cache) {
            pbuf->read_cache_mutex.unlock();
         }
         // bail out with all locks released
         return pbuf_guard.get_status();
      }
      
      /* need to revalidate our BUFFER_CLIENT after releasing the buffer lock
       * because we may have been removed from the buffer by bm_cleanup() & co
       * due to a timeout or whatever. */
      pc = bm_get_my_client_locked(pbuf_guard);
 
      /* return if TCP connection broken */
      if (status == SS_ABORT)
         return SS_ABORT;
 
      if (timeout_msec == BM_NO_WAIT)
         return BM_ASYNC_RETURN;
   }
 
   if (pc->read_wait) {
      //printf("bm_wait_for_more_events: buffer [%s] client [%s] clear read_wait!\n", pheader->name, pc->name);
      pc->read_wait = FALSE;
   }
 
   return BM_SUCCESS;
}
 
static void bm_write_to_buffer_locked(BUFFER_HEADER *pheader, int sg_n, const char* const sg_ptr[], const size_t sg_len[], size_t total_size)
{
   char *pdata = (char *) (pheader + 1);
 
   //int old_write_pointer = pheader->write_pointer;
 
   /* new event fits into the remaining space? */
   if ((size_t)pheader->write_pointer + total_size <= (size_t)pheader->size) {
      //memcpy(pdata + pheader->write_pointer, pevent, event_size);
      char* wptr = pdata + pheader->write_pointer;
      for (int i=0; i<sg_n; i++) {
         //printf("memcpy %p+%d\n", sg_ptr[i], (int)sg_len[i]);
         memcpy(wptr, sg_ptr[i], sg_len[i]);
         wptr += sg_len[i];
      }
      pheader->write_pointer = pheader->write_pointer + total_size;
      assert(pheader->write_pointer <= pheader->size);
      /* remaining space is smaller than size of an event header? */
      if ((pheader->write_pointer + (int) sizeof(EVENT_HEADER)) > pheader->size) {
         // note: ">" here to match "bm_incr_rp". If remaining space is exactly
         // equal to the event header size, we will write the next event header here,
         // then wrap the pointer and write the event data at the beginning of the buffer.
         //printf("bm_write_to_buffer_locked: truncate wp %d. buffer size %d, remaining %d, event header size %d, event size %d, total size %d\n", pheader->write_pointer, pheader->size, pheader->size-pheader->write_pointer, (int)sizeof(EVENT_HEADER), event_size, total_size);
         pheader->write_pointer = 0;
      }
   } else {
      /* split event */
      size_t size = pheader->size - pheader->write_pointer;
 
      //printf("split: wp %d, size %d, avail %d\n", pheader->write_pointer, pheader->size, size);
 
      //memcpy(pdata + pheader->write_pointer, pevent, size);
      //memcpy(pdata, ((const char *) pevent) + size, event_size - size);
 
      char* wptr = pdata + pheader->write_pointer;
      size_t count = 0;
 
      // copy first part
 
      int i = 0;
      for (; i<sg_n; i++) {
         if (count + sg_len[i] > size)
            break;
         memcpy(wptr, sg_ptr[i], sg_len[i]);
         wptr  += sg_len[i];
         count += sg_len[i];
      }
 
      //printf("wptr %d, count %d\n", wptr-pdata, count);
 
      // split segment
 
      size_t first = size - count;
      size_t second = sg_len[i] - first;
      assert(first + second == sg_len[i]);
      assert(count + first == size);
      
      //printf("first %d, second %d\n", first, second);
      
      memcpy(wptr, sg_ptr[i], first);
      wptr = pdata + 0;
      count += first;
      memcpy(wptr, sg_ptr[i] + first, second);
      wptr  += second;
      count += second;
      i++;
 
      // copy remaining
 
      for (; i<sg_n; i++) {
         memcpy(wptr, sg_ptr[i], sg_len[i]);
         wptr  += sg_len[i];
         count += sg_len[i];
      }
 
      //printf("wptr %d, count %d\n", wptr-pdata, count);
 
      //printf("bm_write_to_buffer_locked: wrap wp %d -> %d. buffer size %d, available %d, wrote %d, remaining %d, event size %d, total size %d\n", pheader->write_pointer, total_size-size, pheader->size, pheader->size-pheader->write_pointer, size, pheader->size - (pheader->write_pointer+size), event_size, total_size);
 
      pheader->write_pointer = total_size - size;
   }
 
   //printf("bm_write_to_buffer_locked: buf [%s] size %d, wrote %d/%d, wp %d -> %d\n", pheader->name, pheader->size, event_size, total_size, old_write_pointer, pheader->write_pointer);
}
 
static int bm_find_first_request_locked(BUFFER_CLIENT *pc, const EVENT_HEADER *pevent) {
   if (pc->pid) {
      int j;
      for (j = 0; j < pc->max_request_index; j++) {
         const EVENT_REQUEST *prequest = pc->event_request + j;
         if (prequest->valid && bm_match_event(prequest->event_id, prequest->trigger_mask, pevent)) {
            return prequest->id;
         }
      }
   }
 
   return -1;
}
 
static void bm_notify_reader_locked(BUFFER_HEADER *pheader, BUFFER_CLIENT *pc, int old_write_pointer, int request_id) {
   if (request_id >= 0) {
      /* if that client has a request and is suspended, wake it up */
      if (pc->read_wait) {
         char str[80];
         sprintf(str, "B %s %d", pheader->name, request_id);
         ss_resume(pc->port, str);
         //printf("bm_notify_reader_locked: buffer [%s] client [%s] request_id %d, port %d, message [%s]\n", pheader->name, pc->name, request_id, pc->port, str);
         //printf("bm_notify_reader_locked: buffer [%s] client [%s] clear read_wait!\n", pheader->name, pc->name);
         pc->read_wait = FALSE;
      }
   }
}
 
#endif // LOCAL_ROUTINES
 
#if 0
INT bm_send_event_rpc(INT buffer_handle, const EVENT_HEADER *pevent, int event_size, int timeout_msec)
{
   //printf("bm_send_event_rpc: handle %d, size %d, timeout %d\n", buffer_handle, event_size, timeout_msec);
 
   DWORD time_start = ss_millitime();
   DWORD time_end = time_start + timeout_msec;
   
   int xtimeout_msec = timeout_msec;
 
   while (1) {
      if (timeout_msec == BM_WAIT) {
         xtimeout_msec = 1000;
      } else if (timeout_msec == BM_NO_WAIT) {
         xtimeout_msec = BM_NO_WAIT;
      } else {
         if (xtimeout_msec > 1000) {
            xtimeout_msec = 1000;
         }
      }
   
      int status = rpc_call(RPC_BM_SEND_EVENT, buffer_handle, pevent, event_size, xtimeout_msec);
 
      //printf("bm_send_event_rpc: handle %d, size %d, timeout %d, status %d\n", buffer_handle, event_size, xtimeout_msec, status);
 
      if (status == BM_ASYNC_RETURN) {
         if (timeout_msec == BM_WAIT) {
            // BM_WAIT means wait forever
            continue;
         } else if (timeout_msec == BM_NO_WAIT) {
            // BM_NO_WAIT means do not wait
            return status;
         } else {
            DWORD now = ss_millitime();
            if (now >= time_end) {
               // timeout, return BM_ASYNC_RETURN
               return status;
            }
 
            DWORD remain = time_end - now;
 
            if (remain < xtimeout_msec) {
               xtimeout_msec = remain;
            }
 
            // keep asking for event...
            continue;
         }
      } else if (status == BM_SUCCESS) {
         // success, return BM_SUCCESS
         return status;
      } else {
         // error
         return status;
      }
   }
}
#endif
 
INT bm_send_event(INT buffer_handle, const EVENT_HEADER *pevent, int unused, int timeout_msec)
{
   const DWORD MAX_DATA_SIZE = (0x7FFFFFF0 - 16); // event size computations are not 32-bit clean, limit event size to 2GB. K.O.
   const DWORD data_size = pevent->data_size; // 32-bit unsigned value
 
   if (data_size == 0) {
      cm_msg(MERROR, "bm_send_event", "invalid event data size zero");
      return BM_INVALID_SIZE;
   }
 
   if (data_size > MAX_DATA_SIZE) {
      cm_msg(MERROR, "bm_send_event", "invalid event data size %d (0x%x) maximum is %d (0x%x)", data_size, data_size, MAX_DATA_SIZE, MAX_DATA_SIZE);
      return BM_INVALID_SIZE;
   }
 
   const size_t event_size = sizeof(EVENT_HEADER) + data_size;
 
   //printf("bm_send_event: pevent %p, data_size %d, event_size %d, buf_size %d\n", pevent, data_size, event_size, unused);
 
   if (rpc_is_remote()) {
      //return bm_send_event_rpc(buffer_handle, pevent, event_size, timeout_msec);
      return rpc_send_event_sg(buffer_handle, 1, (char**)&pevent, &event_size);
   } else {
      return bm_send_event_sg(buffer_handle, 1, (char**)&pevent, &event_size, timeout_msec);
   }
}
 
int bm_send_event_vec(int buffer_handle, const std::vector<char>& event, int timeout_msec)
{
   const char* cptr = event.data();
   size_t clen = event.size();
   return bm_send_event_sg(buffer_handle, 1, &cptr, &clen, timeout_msec);
}
 
int bm_send_event_vec(int buffer_handle, const std::vector<std::vector<char>>& event, int timeout_msec)
{
   int sg_n = event.size();
   const char* sg_ptr[sg_n];
   size_t sg_len[sg_n];
   for (int i=0; i<sg_n; i++) {
      sg_ptr[i] = event[i].data();
      sg_len[i] = event[i].size();
   }
   return bm_send_event_sg(buffer_handle, sg_n, sg_ptr, sg_len, timeout_msec);
}
 
#ifdef LOCAL_ROUTINES
static INT bm_flush_cache_locked(bm_lock_buffer_guard& pbuf_guard, int timeout_msec);
#endif
 
/********************************************************************/
int bm_send_event_sg(int buffer_handle, int sg_n, const char* const sg_ptr[], const size_t sg_len[], int timeout_msec)
{
   if (rpc_is_remote())
      return rpc_send_event_sg(buffer_handle, sg_n, sg_ptr, sg_len);
 
   if (sg_n < 1) {
      cm_msg(MERROR, "bm_send_event", "invalid sg_n %d", sg_n);
      return BM_INVALID_SIZE;
   }
 
   if (sg_ptr[0] == NULL) {
      cm_msg(MERROR, "bm_send_event", "invalid sg_ptr[0] is NULL");
      return BM_INVALID_SIZE;
   }
 
   if (sg_len[0] < sizeof(EVENT_HEADER)) {
      cm_msg(MERROR, "bm_send_event", "invalid sg_len[0] value %d is smaller than event header size %d", (int)sg_len[0], (int)sizeof(EVENT_HEADER));
      return BM_INVALID_SIZE;
   }
 
   const EVENT_HEADER* pevent = (const EVENT_HEADER*)sg_ptr[0];
   
   const DWORD MAX_DATA_SIZE = (0x7FFFFFF0 - 16); // event size computations are not 32-bit clean, limit event size to 2GB. K.O.
   const DWORD data_size = pevent->data_size; // 32-bit unsigned value
 
   if (data_size == 0) {
      cm_msg(MERROR, "bm_send_event", "invalid event data size zero");
      return BM_INVALID_SIZE;
   }
 
   if (data_size > MAX_DATA_SIZE) {
      cm_msg(MERROR, "bm_send_event", "invalid event data size %d (0x%x) maximum is %d (0x%x)", data_size, data_size, MAX_DATA_SIZE, MAX_DATA_SIZE);
      return BM_INVALID_SIZE;
   }
 
   const size_t event_size = sizeof(EVENT_HEADER) + data_size;
 
   size_t count = 0;
   for (int i=0; i<sg_n; i++) {
      count += sg_len[i];
   }
 
   if (count != event_size) {
      cm_msg(MERROR, "bm_send_event", "data size mismatch: event data_size %d, event_size %d not same as sum of sg_len %d", (int)data_size, (int)event_size, (int)count);
      return BM_INVALID_SIZE;
   }
 
   //printf("bm_send_event_sg: pevent %p, event_id 0x%04x, serial 0x%08x, data_size %d, event_size %d, total_size %d\n", pevent, pevent->event_id, pevent->serial_number, (int)pevent->data_size, (int)event_size, (int)total_size);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
      const size_t total_size = ALIGN8(event_size);
 
      BUFFER *pbuf = bm_get_buffer("bm_send_event_sg", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      /* round up total_size to next DWORD boundary */
      //int total_size = ALIGN8(event_size);
 
      /* check if write cache is enabled */
      if (pbuf->write_cache_size) {
         status = bm_lock_buffer_write_cache(pbuf);
 
         if (status != BM_SUCCESS)
            return status;
         
         /* check if write cache is enabled */
         if (pbuf->write_cache_size) {
            size_t max_event_size = pbuf->write_cache_size/MAX_WRITE_CACHE_EVENT_SIZE_DIV;
            bool too_big = event_size > max_event_size;
 
            //printf("bm_send_event: write %zu/%zu max %zu, cache size %zu, wp %zu\n", event_size, total_size, max_event_size, pbuf->write_cache_size.load(), pbuf->write_cache_wp);
 
            /* if this event does not fit into the write cache, flush the write cache */
            if (pbuf->write_cache_wp > 0 && (pbuf->write_cache_wp + total_size > pbuf->write_cache_size || too_big)) {
               //printf("bm_send_event: write %zu/%zu but cache is full, size %zu, wp %zu\n", event_size, total_size, pbuf->write_cache_size.load(), pbuf->write_cache_wp);
 
               bm_lock_buffer_guard pbuf_guard(pbuf);
 
               if (!pbuf_guard.is_locked()) {
                  pbuf->write_cache_mutex.unlock();
                  return pbuf_guard.get_status();
               }
 
               int status = bm_flush_cache_locked(pbuf_guard, timeout_msec);
 
               if (pbuf_guard.is_locked()) {
                  // check if bm_wait_for_free_space() failed to relock the buffer
                  pbuf_guard.unlock();
               }
 
               if (status != BM_SUCCESS) {
                  pbuf->write_cache_mutex.unlock();
                  // bm_flush_cache() failed: timeout in bm_wait_for_free_space() or write cache size is bigger than buffer size or buffer was closed.
                  if (status == BM_NO_MEMORY)
                     cm_msg(MERROR, "bm_send_event", "write cache size is bigger than buffer size");
                  return status;
               }
 
               // write cache must be empty here
               assert(pbuf->write_cache_wp == 0);
            }
 
            /* write this event into the write cache, if it is not too big and if it fits */
            if (!too_big && pbuf->write_cache_wp + total_size <= pbuf->write_cache_size) {
               //printf("bm_send_event: write %d/%d to cache size %d, wp %d\n", (int)event_size, (int)total_size, (int)pbuf->write_cache_size, (int)pbuf->write_cache_wp);
               
               char* wptr = pbuf->write_cache + pbuf->write_cache_wp;
               
               for (int i=0; i<sg_n; i++) {
                  memcpy(wptr, sg_ptr[i], sg_len[i]);
                  wptr += sg_len[i];
               }
 
               pbuf->write_cache_wp += total_size;
 
               pbuf->write_cache_mutex.unlock();
               return BM_SUCCESS;
            }
         }
 
         /* event did not fit into the write cache, we flushed the write cache and we send it directly to shared memory */
         pbuf->write_cache_mutex.unlock();
      }
 
      /* we come here only for events that are too big to fit into the cache */
 
      /* lock the buffer */
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked()) {
         return pbuf_guard.get_status();
      }
 
      /* calculate some shorthands */
      BUFFER_HEADER *pheader = pbuf->buffer_header;
 
#if 0
      status = bm_validate_buffer_locked(pbuf);
      if (status != BM_SUCCESS) {
         printf("bm_send_event: corrupted 111!\n");
         abort();
      }
#endif
 
      /* check if buffer is large enough */
      if (total_size >= (size_t)pheader->size) {
         pbuf_guard.unlock(); // unlock before cm_msg()
         cm_msg(MERROR, "bm_send_event", "total event size (%d) larger than size (%d) of buffer \'%s\'", (int)total_size, pheader->size, pheader->name);
         return BM_NO_MEMORY;
      }
 
      status = bm_wait_for_free_space_locked(pbuf_guard, timeout_msec, total_size, false);
 
      if (status != BM_SUCCESS) {
         // implicit unlock
         return status;
      }
 
#if 0
      status = bm_validate_buffer_locked(pbuf);
      if (status != BM_SUCCESS) {
         printf("bm_send_event: corrupted 222!\n");
         abort();
      }
#endif
 
      int old_write_pointer = pheader->write_pointer;
 
      bm_write_to_buffer_locked(pheader, sg_n, sg_ptr, sg_len, total_size);
 
      /* write pointer was incremented, but there should
       * always be some free space in the buffer and the
       * write pointer should never cacth up to the read pointer:
       * the rest of the code gets confused this happens (buffer 100% full)
       * as it is write_pointer == read_pointer can be either
       * 100% full or 100% empty. My solution: never fill
       * the buffer to 100% */
      assert(pheader->write_pointer != pheader->read_pointer);
 
      /* send wake up messages to all clients that want this event */
      int i;
      for (i = 0; i < pheader->max_client_index; i++) {
         BUFFER_CLIENT *pc = pheader->client + i;
         int request_id = bm_find_first_request_locked(pc, pevent);
         bm_notify_reader_locked(pheader, pc, old_write_pointer, request_id);
      }
 
#if 0
      status = bm_validate_buffer_locked(pbuf);
      if (status != BM_SUCCESS) {
         printf("bm_send_event: corrupted 333!\n");
         abort();
      }
#endif
 
      /* update statistics */
      pheader->num_in_events++;
      pbuf->count_sent += 1;
      pbuf->bytes_sent += total_size;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
static int bm_flush_cache_rpc(int buffer_handle, int timeout_msec)
{
   //printf("bm_flush_cache_rpc: handle %d, timeout %d\n", buffer_handle, timeout_msec);
 
   DWORD time_start = ss_millitime();
   DWORD time_end = time_start + timeout_msec;
   DWORD time_bombout = time_end;
 
   if (timeout_msec < 10000)
      time_bombout = time_start + 10000; // 10 seconds
   
   int xtimeout_msec = timeout_msec;
 
   while (1) {
      if (timeout_msec == BM_WAIT) {
         xtimeout_msec = 1000;
      } else if (timeout_msec == BM_NO_WAIT) {
         xtimeout_msec = BM_NO_WAIT;
      } else {
         if (xtimeout_msec > 1000) {
            xtimeout_msec = 1000;
         }
      }
 
      int status = rpc_call(RPC_BM_FLUSH_CACHE, buffer_handle, xtimeout_msec);
      
      //printf("bm_flush_cache_rpc: handle %d, timeout %d, status %d\n", buffer_handle, xtimeout_msec, status);
 
      if (status == BM_ASYNC_RETURN) {
         if (timeout_msec == BM_WAIT) {
            DWORD now = ss_millitime();
            if (now >= time_bombout) {
               // timeout
               return BM_TIMEOUT;
            }
 
            // BM_WAIT means wait forever
            continue;
         } else if (timeout_msec == BM_NO_WAIT) {
            // BM_NO_WAIT means do not wait
            return status;
         } else {
            DWORD now = ss_millitime();
            if (now >= time_end) {
               // timeout, return BM_ASYNC_RETURN
               return status;
            }
 
            DWORD remain = time_end - now;
 
            if (remain < (DWORD)xtimeout_msec) {
               xtimeout_msec = remain;
            }
 
            if (now >= time_bombout) {
               // timeout
               return BM_TIMEOUT;
            }
 
            // keep asking for event...
            continue;
         }
      } else if (status == BM_SUCCESS) {
         // success, return BM_SUCCESS
         return status;
      } else {
         // error
         return status;
      }
   }
}
 
/********************************************************************/
#ifdef LOCAL_ROUTINES
static INT bm_flush_cache_locked(bm_lock_buffer_guard& pbuf_guard, int timeout_msec)
{
   // NB we come here with write cache locked and buffer locked.
 
   {
      INT status = 0;
 
      //printf("bm_flush_cache_locked!\n");
 
      BUFFER* pbuf = pbuf_guard.get_pbuf();
      BUFFER_HEADER* pheader = pbuf->buffer_header;
 
      //printf("bm_flush_cache_locked: buffer %s, cache rp %zu, wp %zu, timeout %d msec\n", pbuf->buffer_name, pbuf->write_cache_rp, pbuf->write_cache_wp, timeout_msec);
 
      int old_write_pointer = pheader->write_pointer;
 
      int request_id[MAX_CLIENTS];
      for (int i = 0; i < pheader->max_client_index; i++) {
         request_id[i] = -1;
      }
         
      size_t ask_rp = pbuf->write_cache_rp;
      size_t ask_wp = pbuf->write_cache_wp;
 
      if (ask_wp == 0) { // nothing to do
         return BM_SUCCESS;
      }
 
      if (ask_rp == ask_wp) { // nothing to do
         return BM_SUCCESS;
      }
 
      assert(ask_rp < ask_wp);
 
      size_t ask_free = ALIGN8(ask_wp - ask_rp);
 
      if (ask_free == 0) { // nothing to do
         return BM_SUCCESS;
      }
 
#if 0
      status = bm_validate_buffer_locked(pbuf);
      if (status != BM_SUCCESS) {
         printf("bm_flush_cache: corrupted 111!\n");
         abort();
      }
#endif
 
      status = bm_wait_for_free_space_locked(pbuf_guard, timeout_msec, ask_free, true);
 
      if (status != BM_SUCCESS) {
         return status;
      }
 
      // NB: ask_rp, ask_wp and ask_free are invalid after calling bm_wait_for_free_space():
      //
      // wait_for_free_space() will sleep with all locks released,
      // during this time, another thread may call bm_send_event() that will
      // add one or more events to the write cache and after wait_for_free_space()
      // returns, size of data in cache will be bigger than the amount
      // of free space we requested. so we need to keep track of how
      // much data we write to the buffer and ask for more data
      // if we run short. This is the reason for the big loop
      // around wait_for_free_space(). We ask for slightly too little free
      // space to make sure all this code is always used and does work. K.O.
 
      if (pbuf->write_cache_wp == 0) {
         /* somebody emptied the cache while we were inside bm_wait_for_free_space */
         return BM_SUCCESS;
      }
 
      //size_t written = 0;
      while (pbuf->write_cache_rp < pbuf->write_cache_wp) {
         /* loop over all events in cache */
 
         const EVENT_HEADER *pevent = (const EVENT_HEADER *) (pbuf->write_cache + pbuf->write_cache_rp);
         size_t event_size = (pevent->data_size + sizeof(EVENT_HEADER));
         size_t total_size = ALIGN8(event_size);
 
#if 0
         printf("bm_flush_cache: cache size %d, wp %d, rp %d, event data_size %d, event_size %d, total_size %d, free %d, written %d\n",
                int(pbuf->write_cache_size),
                int(pbuf->write_cache_wp),
                int(pbuf->write_cache_rp),
                int(pevent->data_size),
                int(event_size),
                int(total_size),
                int(ask_free),
                int(written));
#endif
 
         // check for crazy event size
         assert(total_size >= sizeof(EVENT_HEADER));
         assert(total_size <= (size_t)pheader->size);
 
         bm_write_to_buffer_locked(pheader, 1, (char**)&pevent, &event_size, total_size);
 
         /* update statistics */
         pheader->num_in_events++;
         pbuf->count_sent += 1;
         pbuf->bytes_sent += total_size;
 
         /* see comment for the same code in bm_send_event().
          * We make sure the buffer is never 100% full */
         assert(pheader->write_pointer != pheader->read_pointer);
 
         /* check if anybody has a request for this event */
         for (int i = 0; i < pheader->max_client_index; i++) {
            BUFFER_CLIENT *pc = pheader->client + i;
            int r = bm_find_first_request_locked(pc, pevent);
            if (r >= 0) {
               request_id[i] = r;
            }
         }
            
         /* this loop does not loop forever because rp
          * is monotonously incremented here. write_cache_wp does
          * not change */
 
         pbuf->write_cache_rp += total_size;
         //written += total_size;
 
         assert(pbuf->write_cache_rp > 0);
         assert(pbuf->write_cache_rp <= pbuf->write_cache_size);
         assert(pbuf->write_cache_rp <= pbuf->write_cache_wp);
      }
 
      /* the write cache is now empty */
      assert(pbuf->write_cache_wp == pbuf->write_cache_rp);
      pbuf->write_cache_wp = 0;
      pbuf->write_cache_rp = 0;
 
      /* check which clients are waiting */
      for (int i = 0; i < pheader->max_client_index; i++) {
         BUFFER_CLIENT *pc = pheader->client + i;
         bm_notify_reader_locked(pheader, pc, old_write_pointer, request_id[i]);
      }
   }
 
   return BM_SUCCESS;
}
 
#endif /* LOCAL_ROUTINES */
 
INT bm_flush_cache(int buffer_handle, int timeout_msec)
{
   if (rpc_is_remote()) {
      return bm_flush_cache_rpc(buffer_handle, timeout_msec);
   }
 
#ifdef LOCAL_ROUTINES
   {
      INT status = 0;
 
      //printf("bm_flush_cache!\n");
 
      BUFFER *pbuf = bm_get_buffer("bm_flush_cache", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      if (pbuf->write_cache_size == 0)
         return BM_SUCCESS;
 
      status = bm_lock_buffer_write_cache(pbuf);
 
      if (status != BM_SUCCESS)
         return status;
 
      /* check if anything needs to be flushed */
      if (pbuf->write_cache_wp == 0) {
         pbuf->write_cache_mutex.unlock();
         return BM_SUCCESS;
      }
 
      /* lock the buffer */
      bm_lock_buffer_guard pbuf_guard(pbuf);
 
      if (!pbuf_guard.is_locked())
         return pbuf_guard.get_status();
 
      status = bm_flush_cache_locked(pbuf_guard, timeout_msec);
 
      /* unlock in correct order */
 
      if (pbuf_guard.is_locked()) {
         // check if bm_wait_for_free_space() failed to relock the buffer
         pbuf_guard.unlock();
      }
 
      pbuf->write_cache_mutex.unlock();
 
      return status;
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
#ifdef LOCAL_ROUTINES
 
static INT bm_read_buffer(BUFFER *pbuf, INT buffer_handle, void **bufptr, void *buf, INT *buf_size, std::vector<char> *vecptr, int timeout_msec, int convert_flags, BOOL dispatch) {
   INT status = BM_SUCCESS;
 
   int max_size = 0;
   if (buf_size) {
      max_size = *buf_size;
      *buf_size = 0;
   }
 
   //printf("bm_read_buffer: [%s] timeout %d, conv %d, ptr %p, buf %p, disp %d\n", pbuf->buffer_name, timeout_msec, convert_flags, bufptr, buf, dispatch);
 
   bm_lock_buffer_guard pbuf_guard(pbuf, true); // buffer is not locked
 
   // NB: locking order is: 1st read cache lock, 2nd buffer lock, unlock in reverse order
 
   /* look if there is anything in the cache */
   if (pbuf->read_cache_size > 0) {
 
      status = bm_lock_buffer_read_cache(pbuf);
 
      if (status != BM_SUCCESS)
         return status;
 
      if (pbuf->read_cache_wp == 0) {
 
         // lock buffer for the first time
 
         if (!pbuf_guard.relock()) {
            pbuf->read_cache_mutex.unlock();
            return pbuf_guard.get_status();
         }
 
         status = bm_fill_read_cache_locked(pbuf_guard, timeout_msec);
         if (status != BM_SUCCESS) {
            // unlock in correct order
            if (pbuf_guard.is_locked()) {
               // check if bm_wait_for_more_events() failed to relock the buffer
               pbuf_guard.unlock();
            }
            pbuf->read_cache_mutex.unlock();
            return status;
         }
 
         // buffer remains locked here
      }
      EVENT_HEADER *pevent;
      int event_size;
      int total_size;
      if (bm_peek_read_cache_locked(pbuf, &pevent, &event_size, &total_size)) {
         if (pbuf_guard.is_locked()) {
            // do not need to keep the event buffer locked
            // when reading from the read cache
            pbuf_guard.unlock();
         }
         //printf("bm_read_buffer: [%s] async %d, conv %d, ptr %p, buf %p, disp %d, total_size %d, read from cache %d %d %d\n", pbuf->buffer_name, async_flag, convert_flags, bufptr, buf, dispatch, total_size, pbuf->read_cache_size, pbuf->read_cache_rp, pbuf->read_cache_wp);
         status = BM_SUCCESS;
         if (buf) {
            if (event_size > max_size) {
               cm_msg(MERROR, "bm_read_buffer", "buffer size %d is smaller than event size %d, event truncated. buffer \"%s\"", max_size, event_size, pbuf->buffer_name);
               event_size = max_size;
               status = BM_TRUNCATED;
            }
 
            memcpy(buf, pevent, event_size);
 
            if (buf_size) {
               *buf_size = event_size;
            }
            if (convert_flags) {
               bm_convert_event_header((EVENT_HEADER *) buf, convert_flags);
            }
         } else if (bufptr) {
            *bufptr = malloc(event_size);
            memcpy(*bufptr, pevent, event_size);
            status = BM_SUCCESS;
         } else if (vecptr) {
            vecptr->resize(0);
            char* cptr = (char*)pevent;
            vecptr->assign(cptr, cptr+event_size);
         }
         bm_incr_read_cache_locked(pbuf, total_size);
         pbuf->read_cache_mutex.unlock();
         if (dispatch) {
            // FIXME need to protect currently dispatched event against
            // another thread overwriting it by refilling the read cache
            bm_dispatch_event(buffer_handle, pevent);
            return BM_MORE_EVENTS;
         }
         // buffer is unlocked here
         return status;
      }
      pbuf->read_cache_mutex.unlock();
   }
 
   /* we come here if the read cache is disabled */
   /* we come here if the next event is too big to fit into the read cache */
 
   if (!pbuf_guard.is_locked()) {
      if (!pbuf_guard.relock())
         return pbuf_guard.get_status();
   }
 
   EVENT_HEADER *event_buffer = NULL;
 
   BUFFER_HEADER *pheader = pbuf->buffer_header;
 
   BUFFER_CLIENT *pc = bm_get_my_client_locked(pbuf_guard);
 
   while (1) {
      /* loop over events in the event buffer */
 
      status = bm_wait_for_more_events_locked(pbuf_guard, pc, timeout_msec, FALSE);
 
      if (status != BM_SUCCESS) {
         // implicit unlock
         return status;
      }
 
      /* check if event at current read pointer matches a request */
 
      EVENT_HEADER *pevent;
      int event_size;
      int total_size;
 
      status = bm_peek_buffer_locked(pbuf, pheader, pc, &pevent, &event_size, &total_size);
      if (status == BM_CORRUPTED) {
         // implicit unlock
         return status;
      } else if (status != BM_SUCCESS) {
         /* event buffer is empty */
         break;
      }
 
      BOOL is_requested = bm_check_requests(pc, pevent);
 
      if (is_requested) {
         //printf("bm_read_buffer: [%s] async %d, conv %d, ptr %p, buf %p, disp %d, total_size %d, read from buffer, cache %d %d %d\n", pheader->name, async_flag, convert_flags, bufptr, buf, dispatch, total_size, pbuf->read_cache_size, pbuf->read_cache_rp, pbuf->read_cache_wp);
 
         status = BM_SUCCESS;
 
         if (buf) {
            if (event_size > max_size) {
               cm_msg(MERROR, "bm_read_buffer",
                      "buffer size %d is smaller than event size %d, event truncated. buffer \"%s\"", max_size,
                      event_size, pheader->name);
               event_size = max_size;
               status = BM_TRUNCATED;
            }
 
            bm_read_from_buffer_locked(pheader, pc->read_pointer, (char *) buf, event_size);
 
            if (buf_size) {
               *buf_size = event_size;
            }
 
            if (convert_flags) {
               bm_convert_event_header((EVENT_HEADER *) buf, convert_flags);
            }
 
            pbuf->count_read++;
            pbuf->bytes_read += event_size;
         } else if (dispatch || bufptr) {
            assert(event_buffer == NULL); // make sure we only come here once
            event_buffer = (EVENT_HEADER *) malloc(event_size);
            bm_read_from_buffer_locked(pheader, pc->read_pointer, (char *) event_buffer, event_size);
            pbuf->count_read++;
            pbuf->bytes_read += event_size;
         } else if (vecptr) {
            bm_read_from_buffer_locked(pheader, pc->read_pointer, vecptr, event_size);
            pbuf->count_read++;
            pbuf->bytes_read += event_size;
         }
 
         int new_read_pointer = bm_incr_rp_no_check(pheader, pc->read_pointer, total_size);
         pc->read_pointer = new_read_pointer;
 
         pheader->num_out_events++;
         /* exit loop over events */
         break;
      }
 
      int new_read_pointer = bm_incr_rp_no_check(pheader, pc->read_pointer, total_size);
      pc->read_pointer = new_read_pointer;
      pheader->num_out_events++;
   }
 
   /*
     If read pointer has been changed, it may have freed up some space
     for waiting producers. So check if free space is now more than 50%
     of the buffer size and wake waiting producers.
   */
 
   bm_wakeup_producers_locked(pheader, pc);
 
   pbuf_guard.unlock();
 
   if (dispatch && event_buffer) {
      bm_dispatch_event(buffer_handle, event_buffer);
      free(event_buffer);
      event_buffer = NULL;
      return BM_MORE_EVENTS;
   }
 
   if (bufptr && event_buffer) {
      *bufptr = event_buffer;
      event_buffer = NULL;
      status = BM_SUCCESS;
   }
 
   if (event_buffer) {
      free(event_buffer);
      event_buffer = NULL;
   }
 
   return status;
}
 
#endif
 
static INT bm_receive_event_rpc(INT buffer_handle, void *buf, int *buf_size, EVENT_HEADER** ppevent, std::vector<char>* pvec, int timeout_msec)
{
   //printf("bm_receive_event_rpc: handle %d, buf %p, pevent %p, pvec %p, timeout %d, max_event_size %d\n", buffer_handle, buf, ppevent, pvec, timeout_msec, _bm_max_event_size);
 
   assert(_bm_max_event_size > sizeof(EVENT_HEADER));
 
   void *xbuf = NULL;
   int xbuf_size = 0;
 
   if (buf) {
      xbuf = buf;
      xbuf_size = *buf_size;
   } else if (ppevent) {
      *ppevent = (EVENT_HEADER*)malloc(_bm_max_event_size);
      xbuf_size = _bm_max_event_size;
   } else if (pvec) {
      pvec->resize(_bm_max_event_size);
      xbuf = pvec->data();
      xbuf_size = pvec->size();
   } else {
      assert(!"incorrect call to bm_receivent_event_rpc()");
   }
 
   int status;
   DWORD time_start = ss_millitime();
   DWORD time_end = time_start + timeout_msec;
   
   int xtimeout_msec = timeout_msec;
 
   int zbuf_size = xbuf_size;
 
   while (1) {
      if (timeout_msec == BM_WAIT) {
         xtimeout_msec = 1000;
      } else if (timeout_msec == BM_NO_WAIT) {
         xtimeout_msec = BM_NO_WAIT;
      } else {
         if (xtimeout_msec > 1000) {
            xtimeout_msec = 1000;
         }
      }
 
      zbuf_size = xbuf_size;
 
      status = rpc_call(RPC_BM_RECEIVE_EVENT, buffer_handle, xbuf, &zbuf_size, xtimeout_msec);
      
      //printf("bm_receive_event_rpc: handle %d, timeout %d, status %d, size %d in, %d out, via RPC_BM_RECEIVE_EVENT\n", buffer_handle, xtimeout_msec, status, xbuf_size, zbuf_size);
 
      if (status == BM_ASYNC_RETURN) {
         if (timeout_msec == BM_WAIT) {
            // BM_WAIT means wait forever
            continue;
         } else if (timeout_msec == BM_NO_WAIT) {
            // BM_NO_WAIT means do not wait
            break;
         } else {
            DWORD now = ss_millitime();
            if (now >= time_end) {
               // timeout, return BM_ASYNC_RETURN
               break;
            }
 
            DWORD remain = time_end - now;
 
            if (remain < (DWORD)xtimeout_msec) {
               xtimeout_msec = remain;
            }
 
            // keep asking for event...
            continue;
         }
      } else if (status == BM_SUCCESS) {
         // success, return BM_SUCCESS
         break;
      }
 
      // RPC error
         
      if (buf) {
         *buf_size = 0;
      } else if (ppevent) {
         free(*ppevent);
         *ppevent = NULL;
      } else if (pvec) {
         pvec->resize(0);
      } else {
         assert(!"incorrect call to bm_receivent_event_rpc()");
      }
      
      return status;
   }
 
   // status is BM_SUCCESS or BM_ASYNC_RETURN
 
   if (buf) {
      *buf_size = zbuf_size;
   } else if (ppevent) {
      // nothing to do
      // ppevent = realloc(ppevent, xbuf_size); // shrink memory allocation
   } else if (pvec) {
      pvec->resize(zbuf_size);
   } else {
      assert(!"incorrect call to bm_receivent_event_rpc()");
   }
 
   return status;
}
 
/********************************************************************/
INT bm_receive_event(INT buffer_handle, void *destination, INT *buf_size, int timeout_msec) {
   //printf("bm_receive_event: handle %d, async %d\n", buffer_handle, async_flag);
   if (rpc_is_remote()) {
      return bm_receive_event_rpc(buffer_handle, destination, buf_size, NULL, NULL, timeout_msec);
   }
#ifdef LOCAL_ROUTINES
   {
      INT status = BM_SUCCESS;
 
      BUFFER *pbuf = bm_get_buffer("bm_receive_event", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      int convert_flags = rpc_get_convert_flags();
 
      status = bm_read_buffer(pbuf, buffer_handle, NULL, destination, buf_size, NULL, timeout_msec, convert_flags, FALSE);
      //printf("bm_receive_event: handle %d, async %d, status %d, size %d\n", buffer_handle, async_flag, status, *buf_size);
      return status;
   }
#else                           /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
#endif
}
 
/********************************************************************/
INT bm_receive_event_alloc(INT buffer_handle, EVENT_HEADER **ppevent, int timeout_msec) {
   if (rpc_is_remote()) {
      return bm_receive_event_rpc(buffer_handle, NULL, NULL, ppevent, NULL, timeout_msec);
   }
#ifdef LOCAL_ROUTINES
   {
      INT status = BM_SUCCESS;
 
      BUFFER *pbuf = bm_get_buffer("bm_receive_event_alloc", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      int convert_flags = rpc_get_convert_flags();
 
      return bm_read_buffer(pbuf, buffer_handle, (void **) ppevent, NULL, NULL, NULL, timeout_msec, convert_flags, FALSE);
   }
#else                           /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
#endif
}
 
/********************************************************************/
INT bm_receive_event_vec(INT buffer_handle, std::vector<char> *pvec, int timeout_msec) {
   if (rpc_is_remote()) {
      return bm_receive_event_rpc(buffer_handle, NULL, NULL, NULL, pvec, timeout_msec);
   }
#ifdef LOCAL_ROUTINES
   {
      INT status = BM_SUCCESS;
 
      BUFFER *pbuf = bm_get_buffer("bm_receive_event_vec", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      int convert_flags = rpc_get_convert_flags();
 
      return bm_read_buffer(pbuf, buffer_handle, NULL, NULL, NULL, pvec, timeout_msec, convert_flags, FALSE);
   }
#else /* LOCAL_ROUTINES */
   return BM_SUCCESS;
#endif
}
 
#ifdef LOCAL_ROUTINES
 
static int bm_skip_event(BUFFER* pbuf)
{
   /* clear read cache */
   if (pbuf->read_cache_size > 0) {
 
      int status = bm_lock_buffer_read_cache(pbuf);
 
      if (status != BM_SUCCESS)
         return status;
 
      pbuf->read_cache_rp = 0;
      pbuf->read_cache_wp = 0;
 
      pbuf->read_cache_mutex.unlock();
   }
   
   bm_lock_buffer_guard pbuf_guard(pbuf);
 
   if (!pbuf_guard.is_locked())
      return pbuf_guard.get_status();
   
   BUFFER_HEADER *pheader = pbuf->buffer_header;
   
   /* forward read pointer to global write pointer */
   BUFFER_CLIENT *pclient = bm_get_my_client_locked(pbuf_guard);
   pclient->read_pointer = pheader->write_pointer;
   
   return BM_SUCCESS;
}
 
#endif /* LOCAL_ROUTINES */
 
/********************************************************************/
INT bm_skip_event(INT buffer_handle) {
   if (rpc_is_remote())
      return rpc_call(RPC_BM_SKIP_EVENT, buffer_handle);
 
#ifdef LOCAL_ROUTINES
   {
      int status = 0;
 
      BUFFER *pbuf = bm_get_buffer("bm_skip_event", buffer_handle, &status);
 
      if (!pbuf)
         return status;
 
      return bm_skip_event(pbuf);
   }
#endif
 
   return BM_SUCCESS;
}
 
#ifdef LOCAL_ROUTINES
/********************************************************************/
static INT bm_push_buffer(BUFFER *pbuf, int buffer_handle) {
   //printf("bm_push_buffer: buffer [%s], handle %d, callback %d\n", pbuf->buffer_header->name, buffer_handle, pbuf->callback);
 
   /* return immediately if no callback routine is defined */
   if (!pbuf->callback)
      return BM_SUCCESS;
 
   return bm_read_buffer(pbuf, buffer_handle, NULL, NULL, NULL, NULL, BM_NO_WAIT, 0, TRUE);
}
 
/********************************************************************/
static INT bm_push_event(const char *buffer_name)
{
   std::vector<BUFFER*> mybuffers;
   
   gBuffersMutex.lock();
   mybuffers = gBuffers;
   gBuffersMutex.unlock();
   
   for (size_t i = 0; i < mybuffers.size(); i++) {
      BUFFER *pbuf = mybuffers[i];
      if (!pbuf || !pbuf->attached)
         continue;
      // FIXME: unlocked read access to pbuf->buffer_name!
      if (strcmp(buffer_name, pbuf->buffer_name) == 0) {
         return bm_push_buffer(pbuf, i + 1);
      }
   }
 
   return BM_INVALID_HANDLE;
}
 
#else
 
static INT bm_push_event(const char *buffer_name)
{
   return BM_SUCCESS;                                                  
}
 
#endif /* LOCAL_ROUTINES */
 
/********************************************************************/
INT bm_check_buffers() {
#ifdef LOCAL_ROUTINES
   {
      INT status = 0;
      BOOL bMore;
      DWORD start_time;
      //static DWORD last_time = 0;
 
      /* if running as a server, buffer checking is done by client
         via ASYNC bm_receive_event */
      if (rpc_is_mserver()) {
         return FALSE;
      }
 
      bMore = FALSE;
      start_time = ss_millitime();
 
      std::vector<BUFFER*> mybuffers;
      
      gBuffersMutex.lock();
      mybuffers = gBuffers;
      gBuffersMutex.unlock();
 
      /* go through all buffers */
      for (size_t idx = 0; idx < mybuffers.size(); idx++) {
         BUFFER* pbuf = mybuffers[idx];
 
         if (!pbuf || !pbuf->attached)
            continue;
 
         //int count_loops = 0;
         while (1) {
            if (pbuf->attached) {
               /* one bm_push_event could cause a run stop and a buffer close, which
                * would crash the next call to bm_push_event(). So check for valid
                * buffer on each call */
 
               /* this is what happens:
                * bm_push_buffer() may call a user callback function
                * user callback function may indirectly call bm_close() of this buffer,
                * i.e. if it stops the run,
                * bm_close() will set pbuf->attached to false, but will not delete pbuf or touch gBuffers
                * here we will see pbuf->attched is false and quit this loop
                */
 
               status = bm_push_buffer(pbuf, idx + 1);
 
               if (status == BM_CORRUPTED) {
                  return status;
               }
 
               //printf("bm_check_buffers: bm_push_buffer() returned %d, loop %d, time %d\n", status, count_loops, ss_millitime() - start_time);
 
               if (status != BM_MORE_EVENTS) {
                  //DWORD t = ss_millitime() - start_time;
                  //printf("bm_check_buffers: index %d, period %d, elapsed %d, loop %d, no more events\n", idx, start_time - last_time, t, count_loops);
                  break;
               }
 
               // count_loops++;
            }
 
            // NB: this code has a logic error: if 2 buffers always have data,
            // this timeout will cause us to exit reading the 1st buffer
            // after 1000 msec, then we read the 2nd buffer exactly once,
            // and exit the loop because the timeout is still active -
            // we did not reset "start_time" when we started reading
            // from the 2nd buffer. Result is that we always read all
            // the data in a loop from the 1st buffer, but read just
            // one event from the 2nd buffer, resulting in severe unfairness.
 
            /* stop after one second */
            DWORD t = ss_millitime() - start_time;
            if (t > 1000) {
               //printf("bm_check_buffers: index %d, period %d, elapsed %d, loop %d, timeout.\n", idx, start_time - last_time, t, count_loops);
               bMore = TRUE;
               break;
            }
         }
      }
 
      //last_time = start_time;
 
      return bMore;
 
   }
#else                           /* LOCAL_ROUTINES */
 
   return FALSE;
 
#endif
}
 
/********************************************************************/
static INT bm_notify_client(const char *buffer_name, int client_socket)
/********************************************************************\
 
  Routine: bm_notify_client
 
  Purpose: Called by cm_dispatch_ipc. Send an event notification to
           the connected client. Used by mserver to relay the BM_MSG
           buffer message from local UDP socket to the remote connected client.
 
  Input:
    char  *buffer_name      Name of buffer
    int   client_socket     Network socket to client
 
  Output:
    none
 
  Function value:
    BM_SUCCESS              Successful completion
 
\********************************************************************/
{
   static DWORD last_time = 0;
   DWORD now = ss_millitime();
 
   //printf("bm_notify_client: buffer [%s], socket %d, time %d\n", buffer_name, client_socket, now - last_time);
 
   BUFFER* fbuf = NULL;
 
   gBuffersMutex.lock();
 
   for (size_t i = 0; i < gBuffers.size(); i++) {
      BUFFER* pbuf = gBuffers[i];
      if (!pbuf || !pbuf->attached)
         continue;
      if (strcmp(buffer_name, pbuf->buffer_header->name) == 0) {
         fbuf = pbuf;
         break;
      }
   }
 
   gBuffersMutex.unlock();
 
   if (!fbuf)
      return BM_INVALID_HANDLE;
 
   /* don't send notification if client has no callback defined
      to receive events -> client calls bm_receive_event manually */
   if (!fbuf->callback)
      return DB_SUCCESS;
 
   int convert_flags = rpc_get_convert_flags();
 
   /* only send notification once each 500ms */
   if (now - last_time < 500)
      return DB_SUCCESS;
 
   last_time = now;
 
   char buffer[32];
   NET_COMMAND *nc = (NET_COMMAND *) buffer;
 
   nc->header.routine_id = MSG_BM;
   nc->header.param_size = 0;
 
   if (convert_flags) {
      rpc_convert_single(&nc->header.routine_id, TID_UINT32, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&nc->header.param_size, TID_UINT32, RPC_OUTGOING, convert_flags);
   }
 
   //printf("bm_notify_client: Sending MSG_BM! buffer [%s]\n", buffer_name);
 
   /* send the update notification to the client */
   send_tcp(client_socket, (char *) buffer, sizeof(NET_COMMAND_HEADER), 0);
 
   return BM_SUCCESS;
}
 
/********************************************************************/
INT bm_poll_event()
/********************************************************************\
 
  Routine: bm_poll_event
 
  Purpose: Poll an event from a remote server. Gets called by
           rpc_client_dispatch() and by cm_yield()
 
  Function value:
    BM_SUCCESS       At least one event was received and dispatched
    BM_ASYNC_RETURN  No events received
    SS_ABORT         Network connection broken
 
\********************************************************************/
{
   BOOL dispatched_something = FALSE;
 
   //printf("bm_poll_event!\n");
 
   DWORD start_time = ss_millitime();
 
   std::vector<char> vec;
 
   /* loop over all requests */
   _request_list_mutex.lock();
   bool locked = true;
   size_t n = _request_list.size();
   for (size_t i = 0; i < n; i++) {
      if (!locked) {
         _request_list_mutex.lock();
         locked = true;
      }
      /* continue if no dispatcher set (manual bm_receive_event) */
      if (_request_list[i].dispatcher == NULL)
         continue;
 
      int buffer_handle = _request_list[i].buffer_handle;
 
      /* must release the lock on the request list: user provided r.dispatcher() can add or remove event requests, and we will deadlock. K.O. */
      _request_list_mutex.unlock();
      locked = false;
 
      do {
         /* receive event */
         int status = bm_receive_event_vec(buffer_handle, &vec, BM_NO_WAIT);
 
         //printf("bm_poll_event: request_id %d, buffer_handle %d, bm_receive_event(BM_NO_WAIT) status %d, vec size %d, capacity %d\n", request_id, buffer_handle, status, (int)vec.size(), (int)vec.capacity());
 
         /* call user function if successful */
         if (status == BM_SUCCESS) {
            bm_dispatch_event(buffer_handle, (EVENT_HEADER*)vec.data());
            dispatched_something = TRUE;
         }
 
         /* break if no more events */
         if (status == BM_ASYNC_RETURN)
            break;
 
         /* break if corrupted event buffer */
         if (status == BM_TRUNCATED) {
            cm_msg(MERROR, "bm_poll_event", "received event was truncated, buffer size %d is too small, see messages and increase /Experiment/MAX_EVENT_SIZE in ODB", (int)vec.size());
         }
 
         /* break if corrupted event buffer */
         if (status == BM_CORRUPTED)
            return SS_ABORT;
 
         /* break if server died */
         if (status == RPC_NET_ERROR) {
            return SS_ABORT;
         }
 
         /* stop after one second */
         if (ss_millitime() - start_time > 1000) {
            break;
         }
 
      } while (TRUE);
   }
 
   if (locked)
      _request_list_mutex.unlock();
 
   if (dispatched_something)
      return BM_SUCCESS;
   else
      return BM_ASYNC_RETURN;
}
 
/********************************************************************/
INT bm_empty_buffers() {
   if (rpc_is_remote())
      return rpc_call(RPC_BM_EMPTY_BUFFERS);
 
#ifdef LOCAL_ROUTINES
   {
      std::vector<BUFFER*> mybuffers;
      
      gBuffersMutex.lock();
      mybuffers = gBuffers;
      gBuffersMutex.unlock();
 
      /* go through all buffers */
      for (BUFFER* pbuf : mybuffers) {
         if (!pbuf)
            continue;
         if (!pbuf->attached)
            continue;
 
         int status = bm_skip_event(pbuf);
         if (status != BM_SUCCESS)
            return status;
      }
   }
#endif                          /* LOCAL_ROUTINES */
 
   return BM_SUCCESS;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#define MAX_DEFRAG_EVENTS 10
 
typedef struct {
   WORD event_id;
   DWORD data_size;
   DWORD received;
   EVENT_HEADER *pevent;
} EVENT_DEFRAG_BUFFER;
 
static EVENT_DEFRAG_BUFFER defrag_buffer[MAX_DEFRAG_EVENTS];
 
/********************************************************************/
static void bm_defragment_event(HNDLE buffer_handle, HNDLE request_id,
                                EVENT_HEADER *pevent, void *pdata,
                                EVENT_HANDLER *dispatcher)
/********************************************************************\
 
  Routine: bm_defragment_event
 
  Purpose: Called internally from the event receiving routines
           bm_push_event and bm_poll_event to recombine event
           fragments and call the user callback routine upon
           completion.
 
  Input:
    HNDLE buffer_handle  Handle for the buffer containing event
    HNDLE request_id     Handle for event request
    EVENT_HEADER *pevent Pointer to event header
    void *pata           Pointer to event data
    dispatcher()         User callback routine
 
  Output:
    <calls dispatcher() after successfull recombination of event>
 
  Function value:
    void
 
\********************************************************************/
{
   INT i;
 
   if ((uint16_t(pevent->event_id) & uint16_t(0xF000)) == uint16_t(EVENTID_FRAG1)) {
      /*---- start new event ----*/
 
      //printf("First Frag detected : Ser#:%d ID=0x%x \n", pevent->serial_number, pevent->event_id);
 
      /* check if fragments already stored */
      for (i = 0; i < MAX_DEFRAG_EVENTS; i++)
         if (defrag_buffer[i].event_id == (pevent->event_id & 0x0FFF))
            break;
 
      if (i < MAX_DEFRAG_EVENTS) {
         free(defrag_buffer[i].pevent);
         defrag_buffer[i].pevent = NULL;
         memset(&defrag_buffer[i].event_id, 0, sizeof(EVENT_DEFRAG_BUFFER));
         cm_msg(MERROR, "bm_defragement_event",
                "Received new event with ID %d while old fragments were not completed",
                (pevent->event_id & 0x0FFF));
      }
 
      /* search new slot */
      for (i = 0; i < MAX_DEFRAG_EVENTS; i++)
         if (defrag_buffer[i].event_id == 0)
            break;
 
      if (i == MAX_DEFRAG_EVENTS) {
         cm_msg(MERROR, "bm_defragment_event",
                "Not enough defragment buffers, please increase MAX_DEFRAG_EVENTS and recompile");
         return;
      }
 
      /* check event size */
      if (pevent->data_size != sizeof(DWORD)) {
         cm_msg(MERROR, "bm_defragment_event",
                "Received first event fragment with %d bytes instead of %d bytes, event ignored",
                pevent->data_size, (int) sizeof(DWORD));
         return;
      }
 
      /* setup defragment buffer */
      defrag_buffer[i].event_id = (pevent->event_id & 0x0FFF);
      defrag_buffer[i].data_size = *(DWORD *) pdata;
      defrag_buffer[i].received = 0;
      defrag_buffer[i].pevent = (EVENT_HEADER *) malloc(sizeof(EVENT_HEADER) + defrag_buffer[i].data_size);
 
      if (defrag_buffer[i].pevent == NULL) {
         memset(&defrag_buffer[i].event_id, 0, sizeof(EVENT_DEFRAG_BUFFER));
         cm_msg(MERROR, "bm_defragement_event", "Not enough memory to allocate event defragment buffer");
         return;
      }
 
      memcpy(defrag_buffer[i].pevent, pevent, sizeof(EVENT_HEADER));
      defrag_buffer[i].pevent->event_id = defrag_buffer[i].event_id;
      defrag_buffer[i].pevent->data_size = defrag_buffer[i].data_size;
 
      // printf("First frag[%d] (ID %d) Ser#:%d sz:%d\n", i, defrag_buffer[i].event_id,
      //       pevent->serial_number, defrag_buffer[i].data_size);
 
      return;
   }
 
   /* search buffer for that event */
   for (i = 0; i < MAX_DEFRAG_EVENTS; i++)
      if (defrag_buffer[i].event_id == (pevent->event_id & 0xFFF))
         break;
 
   if (i == MAX_DEFRAG_EVENTS) {
      /* no buffer available -> no first fragment received */
      cm_msg(MERROR, "bm_defragement_event",
             "Received fragment without first fragment (ID %d) Ser#:%d",
             pevent->event_id & 0x0FFF, pevent->serial_number);
      return;
   }
 
   /* add fragment to buffer */
   if (pevent->data_size + defrag_buffer[i].received > defrag_buffer[i].data_size) {
      free(defrag_buffer[i].pevent);
      defrag_buffer[i].pevent = NULL;
      memset(&defrag_buffer[i].event_id, 0, sizeof(EVENT_DEFRAG_BUFFER));
      cm_msg(MERROR, "bm_defragement_event",
             "Received fragments with more data (%d) than event size (%d)",
             pevent->data_size + defrag_buffer[i].received, defrag_buffer[i].data_size);
      return;
   }
 
   memcpy(((char *) defrag_buffer[i].pevent) + sizeof(EVENT_HEADER) +
          defrag_buffer[i].received, pdata, pevent->data_size);
 
   defrag_buffer[i].received += pevent->data_size;
 
   //printf("Other frag[%d][%d] (ID %d) Ser#:%d sz:%d\n", i, j++,
   //       defrag_buffer[i].event_id, pevent->serial_number, pevent->data_size);
 
   if (defrag_buffer[i].received == defrag_buffer[i].data_size) {
      /* event complete */
      dispatcher(buffer_handle, request_id, defrag_buffer[i].pevent, defrag_buffer[i].pevent + 1);
      free(defrag_buffer[i].pevent);
      defrag_buffer[i].pevent = NULL;
      memset(&defrag_buffer[i].event_id, 0, sizeof(EVENT_DEFRAG_BUFFER));
   }
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
 
/********************************************************************\
*                                                                    *
*                         RPC functions                              *
*                                                                    *
\********************************************************************/
 
class RPC_CLIENT_CONNECTION
{
public:
   std::atomic_bool connected{false}; /*  socket is connected */
   std::string host_name;       /*  server name             */
   int port = 0;                /*  server port             */
   std::mutex mutex;            /*  connection lock           */
   int index = 0;               /* index in the connection array */
   std::string client_name;     /* name of remote client    */
   int send_sock = 0;           /*  tcp socket              */
   int remote_hw_type = 0;      /*  remote hardware type    */
   int rpc_timeout = 0;         /*  timeout in milliseconds */
 
   void print() {
      printf("index %d, client \"%s\", host \"%s\", port %d, socket %d, connected %d, timeout %d",
             index,
             client_name.c_str(),
             host_name.c_str(),
             port,
             send_sock,
             int(connected),
             rpc_timeout);
   }
 
   void close_locked() {
      if (send_sock > 0) {
         ss_socket_close(&send_sock);
      }
      connected = false;
   }
};
 
/* globals */
 
//
// locking rules for client connections:
//
// lock _client_connections_mutex, look at _client_connections vector and c->connected, unlock _client_connections_mutex
// lock _client_connections_mutex, look at _client_connections vector and c->connected, lock individual connection, recheck c->connected, work on the connection, unlock the connection, unlock _client_connections_mutex
// lock individual connection, check c->connected, work on the connection, unlock connection
//
// ok to access without locking client connection:
//
// - c->connected (std::atomic, but must recheck it after taking the lock)
// - only inside rpc_client_connect() under protection of gHostnameMutex: c->host_name and c->port
//
// this will deadlock, wrong locking order: lock individual connection, lock of _client_connections_mutex
// this will deadlock, wrong unlocking order: unlock of _client_connections_mutex, unlock individual connection
//
// lifetime of client connections:
//
// - client connection slots are allocated by rpc_client_connect()
// - client connection slots are deleted by rpc_client_shutdown() called from cm_disconnect_experiment()
// - client slots marked NULL are free and will be reused by rpc_client_connect()
// - client slots marked c->connected == false are free and will be reused by rpc_client_connect()
// - rpc_client_check() will close connections that have dead tcp sockets, set c->connected = FALSE to mark the slot free for reuse
// - rpc_client_disconnect() will close the connection and set c->connected = FALSE to mark the slot free for reuse
// - rpc_client_call() can race rpc_client_disconnect() running in another thread, if disconnect happens first,
//   client call will see an empty slot and return an error
// - rpc_client_call() can race a disconnect()/connect() pair, if disconnect and connect happen first,
//   client call will be made to the wrong connection. for this reason, one should call rpc_client_disconnect()
//   only when one is sure no other threads are running concurrent rpc client calls.
//
 
static std::mutex _client_connections_mutex;
static std::vector<RPC_CLIENT_CONNECTION*> _client_connections;
 
static RPC_SERVER_CONNECTION _server_connection; // connection to the mserver
static bool _rpc_is_remote = false;
   
//static RPC_SERVER_ACCEPTION _server_acception[MAX_RPC_CONNECTION];
static std::vector<RPC_SERVER_ACCEPTION*> _server_acceptions;
static RPC_SERVER_ACCEPTION* _mserver_acception = NULL; // mserver acception
 
static RPC_SERVER_ACCEPTION* rpc_get_server_acception(int idx)
{
   assert(idx >= 0);
   assert(idx < (int)_server_acceptions.size());
   assert(_server_acceptions[idx] != NULL);
   return _server_acceptions[idx];
}
 
RPC_SERVER_ACCEPTION* rpc_get_mserver_acception()
{
   return _mserver_acception;
}
 
static RPC_SERVER_ACCEPTION* rpc_new_server_acception()
{
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++) {
      if (_server_acceptions[idx] && (_server_acceptions[idx]->recv_sock == 0)) {
         //printf("rpc_new_server_acception: reuse acception in slot %d\n", idx);
         return _server_acceptions[idx];
      }
   }
 
   RPC_SERVER_ACCEPTION* sa = new RPC_SERVER_ACCEPTION;
 
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++) {
      if (_server_acceptions[idx] == NULL) {
         //printf("rpc_new_server_acception: new acception, reuse slot %d\n", idx);
         _server_acceptions[idx] = sa;
         return _server_acceptions[idx];
      }
   }
 
   //printf("rpc_new_server_acception: new acception, array size %d, push_back\n", (int)_server_acceptions.size());
   _server_acceptions.push_back(sa);
   
   return sa;
}
 
void RPC_SERVER_ACCEPTION::close()
{
   //printf("RPC_SERVER_ACCEPTION::close: connection from %s program %s mserver %d\n", host_name.c_str(), prog_name.c_str(), is_mserver);
 
   if (is_mserver) {
      assert(_mserver_acception == this);
      _mserver_acception = NULL;
      is_mserver = false;
   }
   
   /* close server connection */
   if (recv_sock)
      ss_socket_close(&recv_sock);
   if (send_sock)
      ss_socket_close(&send_sock);
   if (event_sock)
      ss_socket_close(&event_sock);
 
   /* free TCP cache */
   if (net_buffer) {
      //printf("free net_buffer %p+%d\n", net_buffer, net_buffer_size);
      free(net_buffer);
      net_buffer = NULL;
      net_buffer_size = 0;
   }
 
   /* mark this entry as invalid */
   clear();
}
 
static std::vector<RPC_LIST> rpc_list;
static std::mutex rpc_list_mutex;
 
static int _opt_tcp_size = OPT_TCP_SIZE;
 
 
/********************************************************************\
*                       conversion functions                         *
\********************************************************************/
 
void rpc_calc_convert_flags(INT hw_type, INT remote_hw_type, INT *convert_flags) {
   *convert_flags = 0;
 
   /* big/little endian conversion */
   if (((remote_hw_type & DRI_BIG_ENDIAN) &&
        (hw_type & DRI_LITTLE_ENDIAN)) || ((remote_hw_type & DRI_LITTLE_ENDIAN)
                                           && (hw_type & DRI_BIG_ENDIAN)))
      *convert_flags |= CF_ENDIAN;
 
   /* float conversion between IEEE and VAX G */
   if ((remote_hw_type & DRF_G_FLOAT) && (hw_type & DRF_IEEE))
      *convert_flags |= CF_VAX2IEEE;
 
   /* float conversion between VAX G and IEEE */
   if ((remote_hw_type & DRF_IEEE) && (hw_type & DRF_G_FLOAT))
      *convert_flags |= CF_IEEE2VAX;
 
   //if (remote_hw_type & DR_ASCII)
   //   *convert_flags |= CF_ASCII;
}
 
/********************************************************************/
void rpc_get_convert_flags(INT *convert_flags) {
   rpc_calc_convert_flags(rpc_get_hw_type(), _server_connection.remote_hw_type, convert_flags);
}
 
/********************************************************************/
void rpc_ieee2vax_float(float *var) {
   unsigned short int lo, hi;
 
   /* swap hi and lo word */
   lo = *((short int *) (var) + 1);
   hi = *((short int *) (var));
 
   /* correct exponent */
   if (lo != 0)
      lo += 0x100;
 
   *((short int *) (var) + 1) = hi;
   *((short int *) (var)) = lo;
}
 
void rpc_vax2ieee_float(float *var) {
   unsigned short int lo, hi;
 
   /* swap hi and lo word */
   lo = *((short int *) (var) + 1);
   hi = *((short int *) (var));
 
   /* correct exponent */
   if (hi != 0)
      hi -= 0x100;
 
   *((short int *) (var) + 1) = hi;
   *((short int *) (var)) = lo;
 
}
 
void rpc_vax2ieee_double(double *var) {
   unsigned short int i1, i2, i3, i4;
 
   /* swap words */
   i1 = *((short int *) (var) + 3);
   i2 = *((short int *) (var) + 2);
   i3 = *((short int *) (var) + 1);
   i4 = *((short int *) (var));
 
   /* correct exponent */
   if (i4 != 0)
      i4 -= 0x20;
 
   *((short int *) (var) + 3) = i4;
   *((short int *) (var) + 2) = i3;
   *((short int *) (var) + 1) = i2;
   *((short int *) (var)) = i1;
}
 
void rpc_ieee2vax_double(double *var) {
   unsigned short int i1, i2, i3, i4;
 
   /* swap words */
   i1 = *((short int *) (var) + 3);
   i2 = *((short int *) (var) + 2);
   i3 = *((short int *) (var) + 1);
   i4 = *((short int *) (var));
 
   /* correct exponent */
   if (i1 != 0)
      i1 += 0x20;
 
   *((short int *) (var) + 3) = i4;
   *((short int *) (var) + 2) = i3;
   *((short int *) (var) + 1) = i2;
   *((short int *) (var)) = i1;
}
 
/********************************************************************/
void rpc_convert_single(void *data, INT tid, INT flags, INT convert_flags) {
 
   if (convert_flags & CF_ENDIAN) {
      if (tid == TID_UINT16 || tid == TID_INT16) WORD_SWAP(data);
      if (tid == TID_UINT32 || tid == TID_INT32 || tid == TID_BOOL || tid == TID_FLOAT) DWORD_SWAP(data);
      if (tid == TID_DOUBLE) QWORD_SWAP(data);
   }
 
   if (((convert_flags & CF_IEEE2VAX) && !(flags & RPC_OUTGOING)) ||
       ((convert_flags & CF_VAX2IEEE) && (flags & RPC_OUTGOING))) {
      if (tid == TID_FLOAT)
         rpc_ieee2vax_float((float *) data);
      if (tid == TID_DOUBLE)
         rpc_ieee2vax_double((double *) data);
   }
 
   if (((convert_flags & CF_IEEE2VAX) && (flags & RPC_OUTGOING)) ||
       ((convert_flags & CF_VAX2IEEE) && !(flags & RPC_OUTGOING))) {
      if (tid == TID_FLOAT)
         rpc_vax2ieee_float((float *) data);
      if (tid == TID_DOUBLE)
         rpc_vax2ieee_double((double *) data);
   }
}
 
void rpc_convert_data(void *data, INT tid, INT flags, INT total_size, INT convert_flags)
/********************************************************************\
 
  Routine: rpc_convert_data
 
  Purpose: Convert data format between differenct computers
 
  Input:
    void   *data            Pointer to data
    INT    tid              Type ID of data, one of TID_xxx
    INT    flags            Combination of following flags:
                              RPC_IN: data is input parameter
                              RPC_OUT: data is output variable
                              RPC_FIXARRAY, RPC_VARARRAY: data is array
                                of "size" bytes (see next param.)
                              RPC_OUTGOING: data is outgoing
    INT    total_size       Size of bytes of data. Used for variable
                            length arrays.
    INT    convert_flags    Flags for data conversion
 
  Output:
    void   *data            Is converted according to _convert_flag
                            value
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   /* convert array */
   if (flags & (RPC_FIXARRAY | RPC_VARARRAY)) {
      int single_size = rpc_tid_size(tid);
      /* don't convert TID_ARRAY & TID_STRUCT */
      if (single_size == 0)
         return;
 
      int n = total_size / single_size;
 
      for (int i = 0; i < n; i++) {
         char* p = (char *) data + (i * single_size);
         rpc_convert_single(p, tid, flags, convert_flags);
      }
   } else {
      rpc_convert_single(data, tid, flags, convert_flags);
   }
}
 
/********************************************************************\
*                       type ID functions                            *
\********************************************************************/
 
INT rpc_tid_size(INT id) {
   if (id >= 0 && id < TID_LAST)
      return tid_size[id];
 
   return 0;
}
 
const char *rpc_tid_name(INT id) {
   if (id >= 0 && id < TID_LAST)
      return tid_name[id];
   else
      return "<unknown>";
}
 
const char *rpc_tid_name_old(INT id) {
   if (id >= 0 && id < TID_LAST)
      return tid_name_old[id];
   else
      return "<unknown>";
}
 
int rpc_name_tid(const char* name) // inverse of rpc_tid_name()
{
   for (int i=0; i<TID_LAST; i++) {
      if (strcmp(name, tid_name[i]) == 0)
         return i;
   }
 
   for (int i=0; i<TID_LAST; i++) {
      if (strcmp(name, tid_name_old[i]) == 0)
         return i;
   }
 
   return 0;
}
 
/********************************************************************\
*                        client functions                            *
\********************************************************************/
 
/********************************************************************/
INT rpc_register_client(const char *name, RPC_LIST *list) {
   rpc_set_name(name);
   rpc_register_functions(rpc_get_internal_list(0), NULL);
   rpc_register_functions(list, NULL);
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_register_functions(const RPC_LIST *new_list, RPC_HANDLER func)
{
   for (int i = 0; new_list[i].id != 0; i++) {
      /* check valid ID for user functions */
      if (new_list != rpc_get_internal_list(0) &&
          new_list != rpc_get_internal_list(1) && (new_list[i].id < RPC_MIN_ID
                                                   || new_list[i].id > RPC_MAX_ID)) {
         cm_msg(MERROR, "rpc_register_functions", "registered RPC function with invalid ID %d", new_list[i].id);
      }
   }
 
   std::lock_guard<std::mutex> guard(rpc_list_mutex);
 
   /* check double defined functions */
   for (int i = 0; new_list[i].id != 0; i++) {
      for (size_t j = 0; j < rpc_list.size(); j++) {
         if (rpc_list[j].id == new_list[i].id) {
            return RPC_DOUBLE_DEFINED;
         }
      }
   }
 
   /* append new functions */
   for (int i = 0; new_list[i].id != 0; i++) {
      RPC_LIST e = new_list[i];
 
      /* set default dispatcher */
      if (e.dispatch == NULL) {
         e.dispatch = func;
      }
 
      rpc_list.push_back(e);
   }
 
   return RPC_SUCCESS;
}
 
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT rpc_deregister_functions()
/********************************************************************\
 
  Routine: rpc_deregister_functions
 
  Purpose: Free memory of previously registered functions
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS              Successful completion
 
\********************************************************************/
{
   rpc_list_mutex.lock();
   rpc_list.clear();
   rpc_list_mutex.unlock();
 
   return RPC_SUCCESS;
}
 
 
/********************************************************************/
INT rpc_register_function(INT id, INT(*func)(INT, void **))
/********************************************************************\
 
  Routine: rpc_register_function
 
  Purpose: Replace a dispatch function for a specific rpc routine
 
  Input:
    INT      id             RPC ID
    INT      *func          New dispatch function
 
  Output:
   <implicit: func gets copied to rpc_list>
 
  Function value:
   RPC_SUCCESS              Successful completion
   RPC_INVALID_ID           RPC ID not found
 
\********************************************************************/
{
   std::lock_guard<std::mutex> guard(rpc_list_mutex);
 
   for (size_t i = 0; i < rpc_list.size(); i++) {
      if (rpc_list[i].id == id) {
         rpc_list[i].dispatch = func;
         return RPC_SUCCESS;
      }
   }
 
   return RPC_INVALID_ID;
}
 
/********************************************************************/
 
static int handle_msg_odb(int n, const NET_COMMAND *nc) {
   //printf("rpc_client_dispatch: MSG_ODB: packet size %d, expected %d\n", n, (int)(sizeof(NET_COMMAND_HEADER) + 4 * sizeof(INT)));
   if (n == sizeof(NET_COMMAND_HEADER) + 4 * sizeof(INT)) {
      /* update a changed record */
      HNDLE hDB = *((INT *) nc->param);
      HNDLE hKeyRoot = *((INT *) nc->param + 1);
      HNDLE hKey = *((INT *) nc->param + 2);
      int index = *((INT *) nc->param + 3);
      return db_update_record_local(hDB, hKeyRoot, hKey, index);
   }
   return CM_VERSION_MISMATCH;
}
 
/********************************************************************/
INT rpc_client_dispatch(int sock)
/********************************************************************\
 
  Routine: rpc_client_dispatch
 
  Purpose: Receive data from the mserver: watchdog and buffer notification messages
 
\********************************************************************/
{
   INT status = 0;
   char net_buffer[256];
 
   int n = recv_tcp(sock, net_buffer, sizeof(net_buffer), 0);
   if (n <= 0)
      return SS_ABORT;
 
   NET_COMMAND *nc = (NET_COMMAND *) net_buffer;
 
   if (nc->header.routine_id == MSG_ODB) {
      status = handle_msg_odb(n, nc);
   } else if (nc->header.routine_id == MSG_WATCHDOG) {
      nc->header.routine_id = 1;
      nc->header.param_size = 0;
      send_tcp(sock, net_buffer, sizeof(NET_COMMAND_HEADER), 0);
      status = RPC_SUCCESS;
   } else if (nc->header.routine_id == MSG_BM) {
      fd_set readfds;
      struct timeval timeout;
 
      //printf("rpc_client_dispatch: received MSG_BM!\n");
 
      /* receive further messages to empty TCP queue */
      do {
         FD_ZERO(&readfds);
         FD_SET(sock, &readfds);
 
         timeout.tv_sec = 0;
         timeout.tv_usec = 0;
 
         select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
 
         if (FD_ISSET(sock, &readfds)) {
            n = recv_tcp(sock, net_buffer, sizeof(net_buffer), 0);
            if (n <= 0)
               return SS_ABORT;
 
            if (nc->header.routine_id == MSG_ODB) {
               status = handle_msg_odb(n, nc);
            } else if (nc->header.routine_id == MSG_WATCHDOG) {
               nc->header.routine_id = 1;
               nc->header.param_size = 0;
               send_tcp(sock, net_buffer, sizeof(NET_COMMAND_HEADER), 0);
               status = RPC_SUCCESS;
            }
         }
 
      } while (FD_ISSET(sock, &readfds));
 
      /* poll event from server */
      status = bm_poll_event();
   }
 
   return status;
}
 
 
/********************************************************************/
INT rpc_client_connect(const char *host_name, INT port, const char *client_name, HNDLE *hConnection)
/********************************************************************\
 
  Routine: rpc_client_connect
 
  Purpose: Establish a network connection to a remote client
 
  Input:
    char *host_name          IP address of host to connect to.
    INT  port                TPC port to connect to.
    char *clinet_name        Client program name
 
  Output:
    HNDLE *hConnection       Handle for new connection which can be used
                             in future rpc_call(hConnection....) calls
 
  Function value:
    RPC_SUCCESS              Successful completion
    RPC_NET_ERROR            Error in socket call
    RPC_NO_CONNECTION        Maximum number of connections reached
    RPC_NOT_REGISTERED       cm_connect_experiment was not called properly
 
\********************************************************************/
{
   INT i, status;
   bool debug = false;
 
   /* check if cm_connect_experiment was called */
   if (_client_name.length() == 0) {
      cm_msg(MERROR, "rpc_client_connect", "cm_connect_experiment/rpc_set_name not called");
      return RPC_NOT_REGISTERED;
   }
 
   /* refuse connection to port 0 */
   if (port == 0) {
      cm_msg(MERROR, "rpc_client_connect", "invalid port %d", port);
      return RPC_NET_ERROR;
   }
 
   RPC_CLIENT_CONNECTION* c = NULL;
 
   static std::mutex gHostnameMutex;
 
   {
      std::lock_guard<std::mutex> guard(_client_connections_mutex);
 
      if (debug) {
         printf("rpc_client_connect: host \"%s\", port %d, client \"%s\"\n", host_name, port, client_name);
         for (size_t i = 0; i < _client_connections.size(); i++) {
            if (_client_connections[i]) {
               printf("client connection %d: ", (int)i);
               _client_connections[i]->print();
               printf("\n");
            }
         }
      }
 
      // slot with index 0 is not used, fill it with a NULL
      
      if (_client_connections.empty()) {
         _client_connections.push_back(NULL);
      }
 
      bool hostname_locked = false;
 
      /* check if connection already exists */
      for (size_t i = 1; i < _client_connections.size(); i++) {
         RPC_CLIENT_CONNECTION* c = _client_connections[i];
         if (c && c->connected) {
 
            if (!hostname_locked) {
               gHostnameMutex.lock();
               hostname_locked = true;
            }
 
            if ((c->host_name == host_name) && (c->port == port)) {
               // NB: we must release the hostname lock before taking
               // c->mutex to avoid a locking order inversion deadlock:
               // later on we lock the hostname mutex while holding the c->mutex
               gHostnameMutex.unlock();
               hostname_locked = false;
               std::lock_guard<std::mutex> cguard(c->mutex);
               // check if socket is still connected
               if (c->connected) {
                  // found connection slot with matching hostname and port number
                  status = ss_socket_wait(c->send_sock, 0);
                  if (status == SS_TIMEOUT) { // yes, still connected and empty
                     // so reuse it connection
                     *hConnection = c->index;
                     if (debug) {
                        printf("already connected: ");
                        c->print();
                        printf("\n");
                     }
                     // implicit unlock of c->mutex
                     // gHostnameLock is not locked here
                     return RPC_SUCCESS;
                  }
                  //cm_msg(MINFO, "rpc_client_connect", "Stale connection to \"%s\" on host %s is closed", _client_connection[i].client_name, _client_connection[i].host_name);
                  c->close_locked();
               }
               // implicit unlock of c->mutex
            }
         }
      }
 
      if (hostname_locked) {
         gHostnameMutex.unlock();
         hostname_locked = false;
      }
      
      // only start reusing connections once we have
      // a good number of slots allocated.
      if (_client_connections.size() > 10) {
         static int last_reused = 0;
 
         int size = _client_connections.size();
         for (int j = 1; j < size; j++) {
            int i = (last_reused + j) % size;
            if (_client_connections[i] && !_client_connections[i]->connected) {
               c = _client_connections[i];
               if (debug) {
                  printf("last reused %d, reusing slot %d: ", last_reused, (int)i);
                  c->print();
                  printf("\n");
               }
               last_reused = i;
               break;
            }
         }
      }
 
      // no slots to reuse, allocate a new slot.
      if (!c) {
         c = new RPC_CLIENT_CONNECTION;
 
         // if empty slot not found, add to end of array
         c->index = _client_connections.size();
         _client_connections.push_back(c);
 
         if (debug) {
            printf("new connection appended to array: ");
            c->print();
            printf("\n");
         }
      }
 
      c->mutex.lock();
      c->connected = true; // rpc_client_connect() in another thread may try to grab this slot
 
      // done with the array of connections
      // implicit unlock of _client_connections_mutex
   }
 
   // locked connection slot for new connection
   assert(c != NULL);
 
   std::string errmsg;
   
   /* create a new socket for connecting to remote server */
   status = ss_socket_connect_tcp(host_name, port, &c->send_sock, &errmsg);
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_client_connect", "cannot connect to \"%s\" port %d: %s", host_name, port, errmsg.c_str());
      c->mutex.unlock();
      return RPC_NET_ERROR;
   }
 
   gHostnameMutex.lock();
 
   c->host_name   = host_name;
   c->port        = port;
 
   gHostnameMutex.unlock();
 
   c->client_name = client_name;
   c->rpc_timeout = DEFAULT_RPC_TIMEOUT;
 
   /* set TCP_NODELAY option for better performance */
   i = 1;
   setsockopt(c->send_sock, IPPROTO_TCP, TCP_NODELAY, (char *) &i, sizeof(i));
 
   /* send local computer info */
   std::string local_prog_name = rpc_get_name();
   std::string local_host_name = ss_gethostname();
 
   int hw_type = rpc_get_hw_type();
 
   std::string cstr = msprintf("%d %s %s %s", hw_type, cm_get_version(), local_prog_name.c_str(), local_host_name.c_str());
 
   int size = cstr.length() + 1;
   i = send(c->send_sock, cstr.c_str(), size, 0);
   if (i < 0 || i != size) {
      cm_msg(MERROR, "rpc_client_connect", "cannot send %d bytes, send() returned %d, errno %d (%s)", size, i, errno, strerror(errno));
      c->mutex.unlock();
      return RPC_NET_ERROR;
   }
 
   bool restore_watchdog_timeout = false;
   BOOL watchdog_call;
   DWORD watchdog_timeout;
   cm_get_watchdog_params(&watchdog_call, &watchdog_timeout);
 
   //printf("watchdog timeout: %d, rpc_connect_timeout: %d\n", watchdog_timeout, _rpc_connect_timeout);
 
   if (_rpc_connect_timeout >= (int) watchdog_timeout) {
      restore_watchdog_timeout = true;
      cm_set_watchdog_params(watchdog_call, _rpc_connect_timeout + 1000);
   }
 
   char str[256];
 
   /* receive remote computer info */
   i = recv_string(c->send_sock, str, sizeof(str), _rpc_connect_timeout);
 
   if (restore_watchdog_timeout) {
      cm_set_watchdog_params(watchdog_call, watchdog_timeout);
   }
 
   if (i <= 0) {
      cm_msg(MERROR, "rpc_client_connect", "timeout waiting for server reply");
      c->close_locked();
      c->mutex.unlock();
      return RPC_NET_ERROR;
   }
 
   int remote_hw_type = 0;
   char remote_version[32];
   remote_version[0] = 0;
   sscanf(str, "%d %s", &remote_hw_type, remote_version);
 
   c->remote_hw_type = remote_hw_type;
 
   /* print warning if version patch level doesn't agree */
   char v1[32];
   mstrlcpy(v1, remote_version, sizeof(v1));
   if (strchr(v1, '.'))
      if (strchr(strchr(v1, '.') + 1, '.'))
         *strchr(strchr(v1, '.') + 1, '.') = 0;
 
   mstrlcpy(str, cm_get_version(), sizeof(str));
   if (strchr(str, '.'))
      if (strchr(strchr(str, '.') + 1, '.'))
         *strchr(strchr(str, '.') + 1, '.') = 0;
 
   if (strcmp(v1, str) != 0) {
      cm_msg(MERROR, "rpc_client_connect", "remote MIDAS version \'%s\' differs from local version \'%s\'", remote_version, cm_get_version());
   }
 
   c->connected = true;
 
   *hConnection = c->index;
 
   c->mutex.unlock();
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
void rpc_client_check()
/********************************************************************\
 
  Routine: rpc_client_check
 
  Purpose: Check all client connections if remote client closed link
 
\********************************************************************/
{
#if 0
   for (i = 0; i < MAX_RPC_CONNECTION; i++)
      if (_client_connection[i].send_sock != 0)
         printf("slot %d, checking client %s socket %d, connected %d\n", i, _client_connection[i].client_name, _client_connection[i].send_sock, _client_connection[i].connected);
#endif
 
   std::lock_guard<std::mutex> guard(_client_connections_mutex);
 
   /* check for broken connections */
   for (unsigned i = 0; i < _client_connections.size(); i++) {
      RPC_CLIENT_CONNECTION* c = _client_connections[i];
      if (c && c->connected) {
         std::lock_guard<std::mutex> cguard(c->mutex);
 
         if (!c->connected) {
            // implicit unlock
            continue;
         }
 
         //printf("rpc_client_check: connection %d: ", i);
         //c->print();
         //printf("\n");
 
         int ok = 0;
 
         fd_set readfds;
         FD_ZERO(&readfds);
         FD_SET(c->send_sock, &readfds);
 
         struct timeval timeout;
         timeout.tv_sec = 0;
         timeout.tv_usec = 0;
 
         int status;
 
#ifdef OS_WINNT
         status = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
#else
         do {
            status = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
         } while (status == -1 && errno == EINTR); /* dont return if an alarm signal was cought */
#endif
 
         if (!FD_ISSET(c->send_sock, &readfds)) {
            // implicit unlock
            continue;
         }
 
         char buffer[64];
 
         status = recv(c->send_sock, (char *) buffer, sizeof(buffer), MSG_PEEK);
         //printf("recv %d status %d, errno %d (%s)\n", sock, status, errno, strerror(errno));
 
         if (status < 0) {
#ifndef OS_WINNT
            if (errno == EAGAIN) { // still connected
               ok = 1;
            } else
#endif
            {
               // connection error
               cm_msg(MERROR, "rpc_client_check",
                      "RPC client connection to \"%s\" on host \"%s\" is broken, recv() errno %d (%s)",
                      c->client_name.c_str(),
                      c->host_name.c_str(),
                      errno, strerror(errno));
               ok = 0;
            }
         } else if (status == 0) {
            // connection closed by remote end without sending an EXIT message
            // this can happen if the remote end has crashed, so this message
            // is still necessary as a useful diagnostic for unexpected crashes
            // of midas programs. K.O.
            cm_msg(MINFO, "rpc_client_check", "RPC client connection to \"%s\" on host \"%s\" unexpectedly closed", c->client_name.c_str(), c->host_name.c_str());
            ok = 0;
         } else {
            // read some data
            ok = 1;
            if (equal_ustring(buffer, "EXIT")) {
               /* normal exit */
               ok = 0;
            }
         }
 
         if (!ok) {
            //printf("rpc_client_check: closing connection %d: ", i);
            //c->print();
            //printf("\n");
 
            // connection lost, close the socket
            c->close_locked();
         }
 
         // implicit unlock
      }
   }
 
   // implicit unlock of _client_connections_mutex
}
 
 
/********************************************************************/
INT rpc_server_connect(const char *host_name, const char *exp_name)
/********************************************************************\
 
  Routine: rpc_server_connect
 
  Purpose: Extablish a network connection to a remote MIDAS
           server using a callback scheme.
 
  Input:
    char *host_name         IP address of host to connect to.
 
    INT  port               TPC port to connect to.
 
    char *exp_name          Name of experiment to connect to. By using
                            this name, several experiments (e.g. online
                            DAQ and offline analysis) can run simultan-
                            eously on the same host.
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS              Successful completion
    RPC_NET_ERROR            Error in socket call
    RPC_NOT_REGISTERED       cm_connect_experiment was not called properly
    CM_UNDEF_EXP             Undefined experiment on server
 
\********************************************************************/
{
   INT i, status;
   INT remote_hw_type, hw_type;
   char str[200], version[32], v1[32];
   fd_set readfds;
   struct timeval timeout;
   int port = MIDAS_TCP_PORT;
   char *s;
 
#ifdef OS_WINNT
   {
      WSADATA WSAData;
 
      /* Start windows sockets */
      if (WSAStartup(MAKEWORD(1, 1), &WSAData) != 0)
         return RPC_NET_ERROR;
   }
#endif
 
   /* check if local connection */
   if (host_name[0] == 0)
      return RPC_SUCCESS;
 
   /* register system functions */
   rpc_register_functions(rpc_get_internal_list(0), NULL);
 
   /* check if cm_connect_experiment was called */
   if (_client_name.length() == 0) {
      cm_msg(MERROR, "rpc_server_connect", "cm_connect_experiment/rpc_set_name not called");
      return RPC_NOT_REGISTERED;
   }
 
   /* check if connection already exists */
   if (_server_connection.send_sock != 0)
      return RPC_SUCCESS;
 
   _server_connection.host_name = host_name;
   _server_connection.exp_name = exp_name;
   _server_connection.rpc_timeout = DEFAULT_RPC_TIMEOUT;
 
   bool listen_localhost = false;
 
   if (strcmp(host_name, "localhost") == 0)
      listen_localhost = true;
 
   int lsock1, lport1;
   int lsock2, lport2;
   int lsock3, lport3;
 
   std::string errmsg;
   
   status = ss_socket_listen_tcp(listen_localhost, 0, &lsock1, &lport1, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_connect", "cannot create listener socket: %s", errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   status = ss_socket_listen_tcp(listen_localhost, 0, &lsock2, &lport2, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_connect", "cannot create listener socket: %s", errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   status = ss_socket_listen_tcp(listen_localhost, 0, &lsock3, &lport3, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_connect", "cannot create listener socket: %s", errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   /* extract port number from host_name */
   mstrlcpy(str, host_name, sizeof(str));
   s = strchr(str, ':');
   if (s) {
      *s = 0;
      port = strtoul(s + 1, NULL, 0);
   }
 
   int sock;
 
   status = ss_socket_connect_tcp(str, port, &sock, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_connect", "cannot connect to mserver on host \"%s\" port %d: %s", str, port, errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   /* connect to experiment */
   if (exp_name[0] == 0)
      sprintf(str, "C %d %d %d %s Default", lport1, lport2, lport3, cm_get_version());
   else
      sprintf(str, "C %d %d %d %s %s", lport1, lport2, lport3, cm_get_version(), exp_name);
 
   send(sock, str, strlen(str) + 1, 0);
   i = recv_string(sock, str, sizeof(str), _rpc_connect_timeout);
   ss_socket_close(&sock);
   if (i <= 0) {
      cm_msg(MERROR, "rpc_server_connect", "timeout on receive status from server");
      return RPC_NET_ERROR;
   }
 
   status = version[0] = 0;
   sscanf(str, "%d %s", &status, version);
 
   if (status == 2) {
/*  message "undefined experiment" should be displayed by application */
      return CM_UNDEF_EXP;
   }
 
   /* print warning if version patch level doesn't agree */
   strcpy(v1, version);
   if (strchr(v1, '.'))
      if (strchr(strchr(v1, '.') + 1, '.'))
         *strchr(strchr(v1, '.') + 1, '.') = 0;
 
   strcpy(str, cm_get_version());
   if (strchr(str, '.'))
      if (strchr(strchr(str, '.') + 1, '.'))
         *strchr(strchr(str, '.') + 1, '.') = 0;
 
   if (strcmp(v1, str) != 0) {
      cm_msg(MERROR, "rpc_server_connect", "remote MIDAS version \'%s\' differs from local version \'%s\'", version,
             cm_get_version());
   }
 
   /* wait for callback on send and recv socket with timeout */
   FD_ZERO(&readfds);
   FD_SET(lsock1, &readfds);
   FD_SET(lsock2, &readfds);
   FD_SET(lsock3, &readfds);
 
   timeout.tv_sec = _rpc_connect_timeout / 1000;
   timeout.tv_usec = 0;
 
   do {
      status = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
 
      /* if an alarm signal was cought, restart select with reduced timeout */
      if (status == -1 && timeout.tv_sec >= WATCHDOG_INTERVAL / 1000)
         timeout.tv_sec -= WATCHDOG_INTERVAL / 1000;
 
   } while (status == -1);      /* dont return if an alarm signal was cought */
 
   if (!FD_ISSET(lsock1, &readfds)) {
      cm_msg(MERROR, "rpc_server_connect", "mserver subprocess could not be started (check path)");
      ss_socket_close(&lsock1);
      ss_socket_close(&lsock2);
      ss_socket_close(&lsock3);
      return RPC_NET_ERROR;
   }
 
   _server_connection.send_sock = accept(lsock1, NULL, NULL);
   _server_connection.recv_sock = accept(lsock2, NULL, NULL);
   _server_connection.event_sock = accept(lsock3, NULL, NULL);
 
   if (_server_connection.send_sock == -1 || _server_connection.recv_sock == -1 || _server_connection.event_sock == -1) {
      cm_msg(MERROR, "rpc_server_connect", "accept() failed");
      return RPC_NET_ERROR;
   }
 
   ss_socket_close(&lsock1);
   ss_socket_close(&lsock2);
   ss_socket_close(&lsock3);
 
   /* set TCP_NODELAY option for better performance */
   int flag = 1;
   setsockopt(_server_connection.send_sock, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(flag));
   setsockopt(_server_connection.event_sock, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(flag));
 
   /* increase send buffer size to 2 Mbytes, on Linux also limited by sysctl net.ipv4.tcp_rmem and net.ipv4.tcp_wmem */
   flag = 2 * 1024 * 1024;
   status = setsockopt(_server_connection.event_sock, SOL_SOCKET, SO_SNDBUF, (char *) &flag, sizeof(flag));
   if (status != 0)
      cm_msg(MERROR, "rpc_server_connect", "cannot setsockopt(SOL_SOCKET, SO_SNDBUF), errno %d (%s)", errno, strerror(errno));
 
   /* send local computer info */
   std::string local_prog_name = rpc_get_name();
   hw_type = rpc_get_hw_type();
   sprintf(str, "%d %s", hw_type, local_prog_name.c_str());
 
   send(_server_connection.send_sock, str, strlen(str) + 1, 0);
 
   /* receive remote computer info */
   i = recv_string(_server_connection.send_sock, str, sizeof(str), _rpc_connect_timeout);
   if (i <= 0) {
      cm_msg(MERROR, "rpc_server_connect", "timeout on receive remote computer info");
      return RPC_NET_ERROR;
   }
 
   sscanf(str, "%d", &remote_hw_type);
   _server_connection.remote_hw_type = remote_hw_type;
 
   ss_suspend_set_client_connection(&_server_connection);
 
   _rpc_is_remote = true;
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
 
static RPC_CLIENT_CONNECTION* rpc_get_locked_client_connection(HNDLE hConn)
{
   _client_connections_mutex.lock();
   if (hConn >= 0 && hConn < (int)_client_connections.size()) {
      RPC_CLIENT_CONNECTION* c = _client_connections[hConn];
      if (c && c->connected) {
         _client_connections_mutex.unlock();
         c->mutex.lock();
         if (!c->connected) {
            // disconnected while we were waiting for the lock
            c->mutex.unlock();
            return NULL;
         }
         return c;
      }
   }
   _client_connections_mutex.unlock();
   return NULL;
}
 
static void rpc_client_shutdown()
{
   /* close all open connections */
 
   _client_connections_mutex.lock();
 
   for (unsigned i = 0; i < _client_connections.size(); i++) {
      RPC_CLIENT_CONNECTION* c = _client_connections[i];
      if (c && c->connected) {
         int index = c->index;
         // must unlock the array, otherwise we hang -
         // rpc_client_disconnect() will do rpc_call_client()
         // which needs to lock the array to convert handle
         // to connection pointer. Ouch! K.O. Dec 2020.
         _client_connections_mutex.unlock();
         rpc_client_disconnect(index, FALSE);
         _client_connections_mutex.lock();
      }
   }
 
   for (unsigned i = 0; i < _client_connections.size(); i++) {
      RPC_CLIENT_CONNECTION* c = _client_connections[i];
      //printf("client connection %d %p\n", i, c);
      if (c) {
         //printf("client connection %d %p connected %d\n", i, c, c->connected);
         if (!c->connected) {
            delete c;
            _client_connections[i] = NULL;
         }
      }
   }
 
   _client_connections_mutex.unlock();
 
   /* close server connection from other clients */
   for (unsigned i = 0; i < _server_acceptions.size(); i++) {
      if (_server_acceptions[i] && _server_acceptions[i]->recv_sock) {
         send(_server_acceptions[i]->recv_sock, "EXIT", 5, 0);
         _server_acceptions[i]->close();
      }
   }
}
 
/********************************************************************/
INT rpc_client_disconnect(HNDLE hConn, BOOL bShutdown)
/********************************************************************\
 
  Routine: rpc_client_disconnect
 
  Purpose: Close a rpc connection to a MIDAS client
 
  Input:
    HNDLE  hConn           Handle of connection
    BOOL   bShutdown       Shut down remote server if TRUE
 
  Output:
    none
 
  Function value:
   RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   /* notify server about exit */
   
   /* call exit and shutdown with RPC_NO_REPLY because client will exit immediately without possibility of replying */
   
   rpc_client_call(hConn, bShutdown ? (RPC_ID_SHUTDOWN | RPC_NO_REPLY) : (RPC_ID_EXIT | RPC_NO_REPLY));
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_server_disconnect()
/********************************************************************\
 
  Routine: rpc_server_disconnect
 
  Purpose: Close a rpc connection to a MIDAS server and close all
           server connections from other clients
 
  Input:
    none
 
  Output:
    none
 
  Function value:
   RPC_SUCCESS             Successful completion
   RPC_NET_ERROR           Error in socket call
   RPC_NO_CONNECTION       Maximum number of connections reached
 
\********************************************************************/
{
   static int rpc_server_disconnect_recursion_level = 0;
 
   if (rpc_server_disconnect_recursion_level)
      return RPC_SUCCESS;
 
   rpc_server_disconnect_recursion_level = 1;
 
   /* flush remaining events */
   rpc_flush_event();
 
   /* notify server about exit */
   if (rpc_is_connected()) {
      rpc_call(RPC_ID_EXIT);
   }
 
   /* close sockets */
   if (_server_connection.send_sock)
      ss_socket_close(&_server_connection.send_sock);
   if (_server_connection.recv_sock)
      ss_socket_close(&_server_connection.recv_sock);
   if (_server_connection.event_sock)
      ss_socket_close(&_server_connection.event_sock);
 
   _server_connection.clear();
 
   /* remove semaphore */
   if (_mutex_rpc)
      ss_mutex_delete(_mutex_rpc);
   _mutex_rpc = NULL;
 
   rpc_server_disconnect_recursion_level = 0;
   return RPC_SUCCESS;
}
 
/********************************************************************/
bool rpc_is_remote(void)
/********************************************************************\
 
  Routine: rpc_is_remote
 
  Purpose: Return true if program is connected to a remote server
 
  Input:
   none
 
  Output:
    none
 
  Function value:
    INT    true is remote client connected to mserver, false if local connection
 
\********************************************************************/
{
   return _rpc_is_remote;
}
 
/********************************************************************/
bool rpc_is_connected(void)
/********************************************************************\
 
  Routine: rpc_is_connected
 
  Purpose: Return true if connection to mserver is still open
 
  Input:
   none
 
  Output:
    none
 
  Function value:
    INT    true if connection to mserver is still open, false if connection to mserver is already closed
 
\********************************************************************/
{
   return _server_connection.send_sock != 0;
}
 
/********************************************************************/
std::string rpc_get_mserver_hostname(void)
/********************************************************************\
 
  Routine: rpc_get_mserver_hostname
 
  Purpose: Return the hostname of the mserver connection (host:port format)
 
\********************************************************************/
{
   return _server_connection.host_name;
}
 
/********************************************************************/
bool rpc_is_mserver(void)
/********************************************************************\
 
  Routine: rpc_is_mserver
 
  Purpose: Return true if we are the mserver
 
  Function value:
    INT    "true" if we are the mserver
 
\********************************************************************/
{
   return _mserver_acception != NULL;
}
 
/********************************************************************/
INT rpc_get_hw_type()
/********************************************************************\
 
  Routine: rpc_get_hw_type
 
  Purpose: get hardware information
 
  Function value:
    INT                     combination of DRI_xxx bits
 
\********************************************************************/
{
   {
      {
         INT tmp_type, size;
         DWORD dummy;
         unsigned char *p;
         float f;
         double d;
 
         tmp_type = 0;
 
         /* test pointer size */
         size = sizeof(p);
         if (size == 2)
            tmp_type |= DRI_16;
         if (size == 4)
            tmp_type |= DRI_32;
         if (size == 8)
            tmp_type |= DRI_64;
 
         /* test if little or big endian machine */
         dummy = 0x12345678;
         p = (unsigned char *) &dummy;
         if (*p == 0x78)
            tmp_type |= DRI_LITTLE_ENDIAN;
         else if (*p == 0x12)
            tmp_type |= DRI_BIG_ENDIAN;
         else
            cm_msg(MERROR, "rpc_get_option", "unknown byte order format");
 
         /* floating point format */
         f = (float) 1.2345;
         dummy = 0;
         memcpy(&dummy, &f, sizeof(f));
         if ((dummy & 0xFF) == 0x19 &&
             ((dummy >> 8) & 0xFF) == 0x04 && ((dummy >> 16) & 0xFF) == 0x9E
             && ((dummy >> 24) & 0xFF) == 0x3F)
            tmp_type |= DRF_IEEE;
         else if ((dummy & 0xFF) == 0x9E &&
                  ((dummy >> 8) & 0xFF) == 0x40 && ((dummy >> 16) & 0xFF) == 0x19
                  && ((dummy >> 24) & 0xFF) == 0x04)
            tmp_type |= DRF_G_FLOAT;
         else
            cm_msg(MERROR, "rpc_get_option", "unknown floating point format");
 
         d = (double) 1.2345;
         dummy = 0;
         memcpy(&dummy, &d, sizeof(f));
         if ((dummy & 0xFF) == 0x8D &&  /* little endian */
             ((dummy >> 8) & 0xFF) == 0x97 && ((dummy >> 16) & 0xFF) == 0x6E
             && ((dummy >> 24) & 0xFF) == 0x12)
            tmp_type |= DRF_IEEE;
         else if ((dummy & 0xFF) == 0x83 &&     /* big endian */
                  ((dummy >> 8) & 0xFF) == 0xC0 && ((dummy >> 16) & 0xFF) == 0xF3
                  && ((dummy >> 24) & 0xFF) == 0x3F)
            tmp_type |= DRF_IEEE;
         else if ((dummy & 0xFF) == 0x13 &&
                  ((dummy >> 8) & 0xFF) == 0x40 && ((dummy >> 16) & 0xFF) == 0x83
                  && ((dummy >> 24) & 0xFF) == 0xC0)
            tmp_type |= DRF_G_FLOAT;
         else if ((dummy & 0xFF) == 0x9E &&
                  ((dummy >> 8) & 0xFF) == 0x40 && ((dummy >> 16) & 0xFF) == 0x18
                  && ((dummy >> 24) & 0xFF) == 0x04)
            cm_msg(MERROR, "rpc_get_option",
                   "MIDAS cannot handle VAX D FLOAT format. Please compile with the /g_float flag");
         else
            cm_msg(MERROR, "rpc_get_option", "unknown floating point format");
 
         return tmp_type;
      }
   }
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
#if 0
INT rpc_set_option(HNDLE hConn, INT item, INT value) {
   switch (item) {
      case RPC_OTIMEOUT:
         if (hConn == -1)
            _server_connection.rpc_timeout = value;
         else if (hConn == -2)
            _rpc_connect_timeout = value;
         else {
            RPC_CLIENT_CONNECTION* c = rpc_get_locked_client_connection(hConn);
            if (c) {
               c->rpc_timeout = value;
               c->mutex.unlock();
            }
         }
         break;
 
      case RPC_NODELAY:
         if (hConn == -1) {
            setsockopt(_server_connection.send_sock, IPPROTO_TCP, TCP_NODELAY, (char *) &value, sizeof(value));
         } else {
            RPC_CLIENT_CONNECTION* c = rpc_get_locked_client_connection(hConn);
            if (c) {
               setsockopt(c->send_sock, IPPROTO_TCP, TCP_NODELAY, (char *) &value, sizeof(value));
               c->mutex.unlock();
            }
         }
         break;
 
      default:
         cm_msg(MERROR, "rpc_set_option", "invalid argument");
         break;
   }
 
   return 0;
}
#endif
 
/********************************************************************/
INT rpc_get_timeout(HNDLE hConn)
{
   if (hConn == RPC_HNDLE_MSERVER) {
      return _server_connection.rpc_timeout;
   } else if (hConn == RPC_HNDLE_CONNECT) {
      return _rpc_connect_timeout;
   } else {
      RPC_CLIENT_CONNECTION* c = rpc_get_locked_client_connection(hConn);
      if (c) {
         int timeout = c->rpc_timeout;
         c->mutex.unlock();
         return timeout;
      }
   }
   return 0;
}
 
/********************************************************************/
INT rpc_set_timeout(HNDLE hConn, int timeout_msec, int* old_timeout_msec)
{
   //printf("rpc_set_timeout: hConn %d, timeout_msec %d\n", hConn, timeout_msec);
 
   if (hConn == RPC_HNDLE_MSERVER) {
      if (old_timeout_msec)
         *old_timeout_msec = _server_connection.rpc_timeout;
      _server_connection.rpc_timeout = timeout_msec;
   } else if (hConn == RPC_HNDLE_CONNECT) {
      if (old_timeout_msec)
         *old_timeout_msec = _rpc_connect_timeout;
      _rpc_connect_timeout = timeout_msec;
   } else {
      RPC_CLIENT_CONNECTION* c = rpc_get_locked_client_connection(hConn);
      if (c) {
         if (old_timeout_msec)
            *old_timeout_msec = c->rpc_timeout;
         c->rpc_timeout = timeout_msec;
         c->mutex.unlock();
      } else {
         if (old_timeout_msec)
            *old_timeout_msec = 0;
      }
   }
   return RPC_SUCCESS;
}
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT rpc_get_convert_flags(void)
/********************************************************************\
 
  Routine: rpc_get_convert_flags
 
  Purpose: Get RPC convert_flags for the mserver connection
 
  Function value:
    INT                     Actual option
 
\********************************************************************/
{
   if (_mserver_acception)
      return _mserver_acception->convert_flags;
   else
      return 0;
}
 
static std::string _mserver_path;
 
/********************************************************************/
const char *rpc_get_mserver_path()
/********************************************************************\
 
  Routine: rpc_get_mserver_path()
 
  Purpose: Get path of the mserver executable
 
\********************************************************************/
{
   return _mserver_path.c_str();
}
 
/********************************************************************/
INT rpc_set_mserver_path(const char *path)
/********************************************************************\
 
  Routine: rpc_set_mserver_path
 
  Purpose: Remember the path of the mserver executable
 
  Input:
   char *path               Full path of the mserver executable
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   _mserver_path = path;
   return RPC_SUCCESS;
}
 
/********************************************************************/
std::string rpc_get_name()
/********************************************************************\
 
  Routine: rpc_get_name
 
  Purpose: Get name set by rpc_set_name
 
  Input:
    none
 
  Output:
    char*  name             The location pointed by *name receives a
                            copy of the _prog_name
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   return _client_name;
}
 
 
/********************************************************************/
INT rpc_set_name(const char *name)
/********************************************************************\
 
  Routine: rpc_set_name
 
  Purpose: Set name of actual program for further rpc connections
 
  Input:
   char *name               Program name, up to NAME_LENGTH chars,
                            no blanks
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   _client_name = name;
 
   return RPC_SUCCESS;
}
 
 
/********************************************************************/
INT rpc_set_debug(void (*func)(const char *), INT mode)
/********************************************************************\
 
  Routine: rpc_set_debug
 
  Purpose: Set a function which is called on every RPC call to
           display the function name and parameters of the RPC
           call.
 
  Input:
   void *func(char*)        Pointer to function.
   INT  mode                Debug mode
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   _debug_print = func;
   _debug_mode = mode;
   return RPC_SUCCESS;
}
 
/********************************************************************/
void rpc_debug_printf(const char *format, ...)
/********************************************************************\
 
  Routine: rpc_debug_print
 
  Purpose: Calls function set via rpc_set_debug to output a string.
 
  Input:
   char *str                Debug string
 
  Output:
    none
 
\********************************************************************/
{
   va_list argptr;
   char str[1000];
 
   if (_debug_mode) {
      va_start(argptr, format);
      vsprintf(str, (char *) format, argptr);
      va_end(argptr);
 
      if (_debug_print) {
         strcat(str, "\n");
         _debug_print(str);
      } else
         puts(str);
   }
}
 
/********************************************************************/
void rpc_va_arg(va_list *arg_ptr, INT arg_type, void *arg) {
   switch (arg_type) {
      /* On the stack, the minimum parameter size is sizeof(int).
         To avoid problems on little endian systems, treat all
         smaller parameters as int's */
      case TID_UINT8:
      case TID_INT8:
      case TID_CHAR:
      case TID_UINT16:
      case TID_INT16:
         *((int *) arg) = va_arg(*arg_ptr, int);
         break;
 
      case TID_INT32:
      case TID_BOOL:
         *((INT *) arg) = va_arg(*arg_ptr, INT);
         break;
 
      case TID_UINT32:
         *((DWORD *) arg) = va_arg(*arg_ptr, DWORD);
         break;
 
         /* float variables are passed as double by the compiler */
      case TID_FLOAT:
         *((float *) arg) = (float) va_arg(*arg_ptr, double);
         break;
 
      case TID_DOUBLE:
         *((double *) arg) = va_arg(*arg_ptr, double);
         break;
 
      case TID_ARRAY:
         *((char **) arg) = va_arg(*arg_ptr, char *);
         break;
   }
}
 
/********************************************************************/
static void rpc_call_encode(va_list& ap, const RPC_LIST& rl, NET_COMMAND** nc)
{
   bool debug = false;
 
   if (debug) {
      printf("encode rpc_id %d \"%s\"\n", rl.id, rl.name);
      for (int i=0; rl.param[i].tid != 0; i++) {
         int tid = rl.param[i].tid;
         int flags = rl.param[i].flags;
         int n = rl.param[i].n;
         printf("i=%d, tid %d, flags 0x%x, n %d\n", i, tid, flags, n);
      }
   }
 
   char args[MAX_RPC_PARAMS][8];
 
   for (int i=0; rl.param[i].tid != 0; i++) {
      int tid = rl.param[i].tid;
      int flags = rl.param[i].flags;
      int arg_type = 0;
 
      bool bpointer = (flags & RPC_POINTER) || (flags & RPC_OUT) ||
         (flags & RPC_FIXARRAY) || (flags & RPC_VARARRAY) ||
         tid == TID_STRING || tid == TID_ARRAY || tid == TID_STRUCT || tid == TID_LINK;
      
      if (bpointer)
         arg_type = TID_ARRAY;
      else
         arg_type = tid;
      
      /* floats are passed as doubles, at least under NT */
      if (tid == TID_FLOAT && !bpointer)
         arg_type = TID_DOUBLE;
      
      //printf("arg %d, tid %d, flags 0x%x, arg_type %d, bpointer %d\n", i, tid, flags, arg_type, bpointer);
 
      rpc_va_arg(&ap, arg_type, args[i]);
   }
 
   size_t buf_size = sizeof(NET_COMMAND) + 4 * 1024;
   char* buf = (char *)malloc(buf_size);
   assert(buf);
 
   (*nc) = (NET_COMMAND*) buf;
 
   /* find out if we are on a big endian system */
   bool bbig = ((rpc_get_hw_type() & DRI_BIG_ENDIAN) > 0);
 
   char* param_ptr = (*nc)->param;
 
   for (int i=0; rl.param[i].tid != 0; i++) {
      int tid = rl.param[i].tid;
      int flags = rl.param[i].flags;
      int arg_type = 0;
 
      bool bpointer = (flags & RPC_POINTER) || (flags & RPC_OUT) ||
                 (flags & RPC_FIXARRAY) || (flags & RPC_VARARRAY) ||
                 tid == TID_STRING || tid == TID_ARRAY || tid == TID_STRUCT || tid == TID_LINK;
 
      if (bpointer)
         arg_type = TID_ARRAY;
      else
         arg_type = tid;
 
      /* floats are passed as doubles, at least under NT */
      if (tid == TID_FLOAT && !bpointer)
         arg_type = TID_DOUBLE;
 
      /* get pointer to argument */
      //char arg[8];
      //rpc_va_arg(&ap, arg_type, arg);
 
      char* arg = args[i];
 
      /* shift 1- and 2-byte parameters to the LSB on big endian systems */
      if (bbig) {
         if (tid == TID_UINT8 || tid == TID_CHAR || tid == TID_INT8) {
            arg[0] = arg[3];
         }
         if (tid == TID_UINT16 || tid == TID_INT16) {
            arg[0] = arg[2];
            arg[1] = arg[3];
         }
      }
 
      if (flags & RPC_IN) {
         int arg_size = 0;
 
         if (bpointer)
            arg_size = rpc_tid_size(tid);
         else
            arg_size = rpc_tid_size(arg_type);
 
         /* for strings, the argument size depends on the string length */
         if (tid == TID_STRING || tid == TID_LINK) {
            arg_size = 1 + strlen((char *) *((char **) arg));
         }
 
         /* for varibale length arrays, the size is given by
            the next parameter on the stack */
         if (flags & RPC_VARARRAY) {
            //va_list aptmp;
            //va_copy(aptmp, ap);
 
            //char arg_tmp[8];
            //rpc_va_arg(&aptmp, TID_ARRAY, arg_tmp);
 
            const char* arg_tmp = args[i+1];
 
            /* for (RPC_IN+RPC_OUT) parameters, size argument is a pointer */
            if (flags & RPC_OUT)
               arg_size = *((INT *) *((void **) arg_tmp));
            else
               arg_size = *((INT *) arg_tmp);
 
            *((INT *) param_ptr) = ALIGN8(arg_size);
            param_ptr += ALIGN8(sizeof(INT));
 
            //va_end(aptmp);
         }
 
         if (tid == TID_STRUCT || (flags & RPC_FIXARRAY))
            arg_size = rl.param[i].n;
 
         /* always align parameter size */
         int param_size = ALIGN8(arg_size);
 
         {
            size_t param_offset = (char *) param_ptr - (char *)(*nc);
 
            if (param_offset + param_size + 16 > buf_size) {
               size_t new_size = param_offset + param_size + 1024;
               //printf("resize nc %zu to %zu\n", buf_size, new_size);
               buf = (char *) realloc(buf, new_size);
               assert(buf);
               buf_size = new_size;
               (*nc) = (NET_COMMAND*) buf;
               param_ptr = buf + param_offset;
            }
         }
 
         if (bpointer) {
            if (debug) {
               printf("encode param %d, flags 0x%x, tid %d, arg_type %d, arg_size %d, param_size %d, memcpy pointer %d\n", i, flags, tid, arg_type, arg_size, param_size, arg_size);
            }
            memcpy(param_ptr, (void *) *((void **) arg), arg_size);
         } else if (tid == TID_FLOAT) {
            if (debug) {
               printf("encode param %d, flags 0x%x, tid %d, arg_type %d, arg_size %d, param_size %d, double->float\n", i, flags, tid, arg_type, arg_size, param_size);
            }
            /* floats are passed as doubles on most systems */
            *((float *) param_ptr) = (float) *((double *) arg);
         } else {
            if (debug) {
               printf("encode param %d, flags 0x%x, tid %d, arg_type %d, arg_size %d, param_size %d, memcpy %d\n", i, flags, tid, arg_type, arg_size, param_size, arg_size);
            }
            memcpy(param_ptr, arg, arg_size);
         }
 
         param_ptr += param_size;
      }
   }
 
   (*nc)->header.param_size = (POINTER_T) param_ptr - (POINTER_T) (*nc)->param;
 
   if (debug)
      printf("encode rpc_id %d \"%s\" buf_size %d, param_size %d\n", rl.id, rl.name, (int)buf_size, (*nc)->header.param_size);
}
 
/********************************************************************/
static int rpc_call_decode(va_list& ap, const RPC_LIST& rl, const char* buf, size_t buf_size)
{
   bool debug = false;
 
   if (debug)
      printf("decode reply to rpc_id %d \"%s\" has %d bytes\n", rl.id, rl.name, (int)buf_size);
 
   /* extract result variables and place it to argument list */
 
   const char* param_ptr = buf;
 
   for (int i = 0; rl.param[i].tid != 0; i++) {
      int tid = rl.param[i].tid;
      int flags = rl.param[i].flags;
      int arg_type = 0;
 
      bool bpointer = (flags & RPC_POINTER) || (flags & RPC_OUT) ||
                 (flags & RPC_FIXARRAY) || (flags & RPC_VARARRAY) ||
                 tid == TID_STRING || tid == TID_ARRAY || tid == TID_STRUCT || tid == TID_LINK;
 
      if (bpointer)
         arg_type = TID_ARRAY;
      else
         arg_type = rl.param[i].tid;
 
      if (tid == TID_FLOAT && !bpointer)
         arg_type = TID_DOUBLE;
 
      char arg[8];
      rpc_va_arg(&ap, arg_type, arg);
 
      if (rl.param[i].flags & RPC_OUT) {
 
         if (param_ptr == NULL) {
            cm_msg(MERROR, "rpc_call_decode", "routine \"%s\": no data in RPC reply, needed to decode an RPC_OUT parameter. param_ptr is NULL", rl.name);
            return RPC_NET_ERROR;
         }
 
         tid = rl.param[i].tid;
         int arg_size = rpc_tid_size(tid);
 
         if (tid == TID_STRING || tid == TID_LINK)
            arg_size = strlen((char *) (param_ptr)) + 1;
 
         if (flags & RPC_VARARRAY) {
            arg_size = *((INT *) param_ptr);
            param_ptr += ALIGN8(sizeof(INT));
         }
 
         if (tid == TID_STRUCT || (flags & RPC_FIXARRAY))
            arg_size = rl.param[i].n;
 
         /* parameter size is always aligned */
         int param_size = ALIGN8(arg_size);
 
         /* return parameters are always pointers */
         if (*((char **) arg)) {
            if (debug)
               printf("decode param %d, flags 0x%x, tid %d, arg_type %d, arg_size %d, param_size %d, memcpy %d\n", i, flags, tid, arg_type, arg_size, param_size, arg_size);
            memcpy((void *) *((char **) arg), param_ptr, arg_size);
         }
 
         param_ptr += param_size;
      }
   }
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_client_call(HNDLE hConn, DWORD routine_id, ...)
/********************************************************************\
 
  Routine: rpc_client_call
 
  Purpose: Call a function on a MIDAS client
 
  Input:
    INT  hConn              Client connection
    INT  routine_id         routine ID as defined in RPC.H (RPC_xxx)
 
    ...                     variable argument list
 
  Output:
    (depends on argument list)
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_NO_CONNECTION       No active connection
    RPC_TIMEOUT             Timeout in RPC call
    RPC_INVALID_ID          Invalid routine_id (not in rpc_list)
    RPC_EXCEED_BUFFER       Paramters don't fit in network buffer
 
\********************************************************************/
{
   RPC_CLIENT_CONNECTION* c = rpc_get_locked_client_connection(hConn);
 
   if (!c) {
      cm_msg(MERROR, "rpc_client_call", "invalid rpc connection handle %d", hConn);
      return RPC_NO_CONNECTION;
   }
 
   //printf("rpc_client_call: handle %d, connection: ", hConn);
   //c->print();
   //printf("\n");
 
   INT i, status;
 
   BOOL rpc_no_reply = routine_id & RPC_NO_REPLY;
   routine_id &= ~RPC_NO_REPLY;
 
   //if (rpc_no_reply)
   //   printf("rpc_client_call: routine_id %d, RPC_NO_REPLY\n", routine_id);
 
   // make local copy of the client name just in case _client_connection is erased by another thread
 
   /* find rpc_index */
 
   int rpc_index = -1;
   const char *rpc_name = NULL;
   RPC_LIST rpc_entry;
 
   rpc_list_mutex.lock();
   for (size_t i = 0; i < rpc_list.size(); i++) {
      if (rpc_list[i].id == (int) routine_id) {
         rpc_index = i;
         rpc_name = rpc_list[rpc_index].name;
         rpc_entry = rpc_list[rpc_index];
         break;
      }
   }
   rpc_list_mutex.unlock();
 
   if (rpc_index < 0) {
      cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" with invalid RPC ID %d", c->client_name.c_str(), c->host_name.c_str(), routine_id);
      c->mutex.unlock();
      return RPC_INVALID_ID;
   }
 
   NET_COMMAND *nc = NULL;
 
   /* examine variable argument list and convert it to parameter array */
   va_list ap;
   va_start(ap, routine_id);
 
   rpc_call_encode(ap, rpc_entry, &nc);
 
   va_end(ap);
 
   nc->header.routine_id = routine_id;
 
   if (rpc_no_reply)
      nc->header.routine_id |= RPC_NO_REPLY;
 
   int send_size = nc->header.param_size + sizeof(NET_COMMAND_HEADER);
 
   /* in FAST TCP mode, only send call and return immediately */
   if (rpc_no_reply) {
      i = send_tcp(c->send_sock, (char *) nc, send_size, 0);
 
      if (i != send_size) {
         cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" RPC \"%s\": send_tcp() failed", c->client_name.c_str(), c->host_name.c_str(), rpc_name);
         free(nc);
         c->mutex.unlock();
         return RPC_NET_ERROR;
      }
 
      free(nc);
 
      if (routine_id == RPC_ID_EXIT || routine_id == RPC_ID_SHUTDOWN) {
         //printf("rpc_client_call: routine_id %d is RPC_ID_EXIT %d or RPC_ID_SHUTDOWN %d, closing connection: ", routine_id, RPC_ID_EXIT, RPC_ID_SHUTDOWN);
         //c->print();
         //printf("\n");
         c->close_locked();
      }
 
      c->mutex.unlock();
      return RPC_SUCCESS;
   }
 
   /* in TCP mode, send and wait for reply on send socket */
   i = send_tcp(c->send_sock, (char *) nc, send_size, 0);
   if (i != send_size) {
      cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" RPC \"%s\": send_tcp() failed", c->client_name.c_str(), c->host_name.c_str(), rpc_name);
      c->mutex.unlock();
      return RPC_NET_ERROR;
   }
 
   free(nc);
   nc = NULL;
 
   bool restore_watchdog_timeout = false;
   BOOL watchdog_call;
   DWORD watchdog_timeout;
   cm_get_watchdog_params(&watchdog_call, &watchdog_timeout);
 
   //printf("watchdog timeout: %d, rpc_timeout: %d\n", watchdog_timeout, c->rpc_timeout);
 
   if (c->rpc_timeout >= (int) watchdog_timeout) {
      restore_watchdog_timeout = true;
      cm_set_watchdog_params(watchdog_call, c->rpc_timeout + 1000);
   }
 
   DWORD rpc_status = 0;
   DWORD buf_size = 0;
   char* buf = NULL;
 
   /* receive result on send socket */
   status = ss_recv_net_command(c->send_sock, &rpc_status, &buf_size, &buf, c->rpc_timeout);
 
   if (restore_watchdog_timeout) {
      cm_set_watchdog_params(watchdog_call, watchdog_timeout);
   }
 
   if (status == SS_TIMEOUT) {
      cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" RPC \"%s\": timeout waiting for reply", c->client_name.c_str(), c->host_name.c_str(), rpc_name);
      if (buf)
         free(buf);
      c->mutex.unlock();
      return RPC_TIMEOUT;
   }
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" RPC \"%s\": error, ss_recv_net_command() status %d", c->client_name.c_str(), c->host_name.c_str(), rpc_name, status);
      if (buf)
         free(buf);
      c->mutex.unlock();
      return RPC_NET_ERROR;
   }
 
   c->mutex.unlock();
 
   if (rpc_status == RPC_INVALID_ID) {
      cm_msg(MERROR, "rpc_client_call", "call to \"%s\" on \"%s\" RPC \"%s\": error, unknown RPC, status %d", c->client_name.c_str(), c->host_name.c_str(), rpc_name, rpc_status);
      if (buf)
         free(buf);
      return rpc_status;
   }
 
   /* extract result variables and place it to argument list */
 
   va_start(ap, routine_id);
 
   status = rpc_call_decode(ap, rpc_entry, buf, buf_size);
 
   if (status != RPC_SUCCESS) {
      rpc_status = status;
   }
 
   va_end(ap);
 
   if (buf)
      free(buf);
   buf = NULL;
   buf_size = 0;
 
   return rpc_status;
}
 
/********************************************************************/
INT rpc_call(DWORD routine_id, ...)
/********************************************************************\
 
  Routine: rpc_call
 
  Purpose: Call a function on a MIDAS server
 
  Input:
    INT  routine_id         routine ID as defined in RPC.H (RPC_xxx)
 
    ...                     variable argument list
 
  Output:
    (depends on argument list)
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_NO_CONNECTION       No active connection
    RPC_TIMEOUT             Timeout in RPC call
    RPC_INVALID_ID          Invalid routine_id (not in rpc_list)
    RPC_EXCEED_BUFFER       Paramters don't fit in network buffer
 
\********************************************************************/
{
   va_list ap;
   INT i, status;
 
   BOOL rpc_no_reply = routine_id & RPC_NO_REPLY;
   routine_id &= ~RPC_NO_REPLY;
 
   //if (rpc_no_reply)
   //   printf("rpc_call: routine_id %d, RPC_NO_REPLY\n", routine_id);
 
   int send_sock = _server_connection.send_sock;
   int rpc_timeout = _server_connection.rpc_timeout;
 
   if (!send_sock) {
      fprintf(stderr, "rpc_call(routine_id=%d) failed, no connection to mserver.\n", routine_id);
      return RPC_NET_ERROR;
   }
 
   if (!_mutex_rpc) {
      /* create a local mutex for multi-threaded applications */
      ss_mutex_create(&_mutex_rpc, FALSE);
   }
 
   status = ss_mutex_wait_for(_mutex_rpc, 10000 + rpc_timeout);
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_call", "Mutex timeout");
      return RPC_MUTEX_TIMEOUT;
   }
 
   /* find rpc definition */
 
   int idx = -1;
   const char* rpc_name = NULL;
   RPC_LIST rpc_entry;
 
   rpc_list_mutex.lock();
 
   for (size_t i = 0; i < rpc_list.size(); i++) {
      if (rpc_list[i].id == (int) routine_id) {
         idx = i;
         rpc_name = rpc_list[idx].name;
         rpc_entry = rpc_list[idx];
         break;
      }
   }
 
   rpc_list_mutex.unlock();
 
   if (idx < 0) {
      ss_mutex_release(_mutex_rpc);
      cm_msg(MERROR, "rpc_call", "invalid rpc ID (%d)", routine_id);
      return RPC_INVALID_ID;
   }
 
   /* prepare output buffer */
 
   NET_COMMAND* nc = NULL;
 
   /* examine variable argument list and convert it to parameter array */
   va_start(ap, routine_id);
 
   rpc_call_encode(ap, rpc_entry, &nc);
 
   va_end(ap);
 
   nc->header.routine_id = routine_id;
 
   if (rpc_no_reply)
      nc->header.routine_id |= RPC_NO_REPLY;
 
   int send_size = nc->header.param_size + sizeof(NET_COMMAND_HEADER);
 
   /* do not wait for reply if requested RPC_NO_REPLY */
   if (rpc_no_reply) {
      i = send_tcp(send_sock, (char *) nc, send_size, 0);
 
      if (i != send_size) {
         ss_mutex_release(_mutex_rpc);
         cm_msg(MERROR, "rpc_call", "rpc \"%s\" error: send_tcp() failed", rpc_name);
         free(nc);
         return RPC_NET_ERROR;
      }
 
      ss_mutex_release(_mutex_rpc);
      free(nc);
      return RPC_SUCCESS;
   }
 
   /* in TCP mode, send and wait for reply on send socket */
   i = send_tcp(send_sock, (char *) nc, send_size, 0);
   if (i != send_size) {
      ss_mutex_release(_mutex_rpc);
      cm_msg(MERROR, "rpc_call", "rpc \"%s\" error: send_tcp() failed", rpc_name);
      free(nc);
      return RPC_NET_ERROR;
   }
 
   free(nc);
   nc = NULL;
 
   bool restore_watchdog_timeout = false;
   BOOL watchdog_call;
   DWORD watchdog_timeout;
   cm_get_watchdog_params(&watchdog_call, &watchdog_timeout);
 
   //printf("watchdog timeout: %d, rpc_timeout: %d\n", watchdog_timeout, rpc_timeout);
 
   if (!rpc_is_remote()) {
      // if RPC is remote, we are connected to an mserver,
      // the mserver takes care of watchdog timeouts.
      // otherwise we should make sure the watchdog timeout
      // is longer than the RPC timeout. K.O.
      if (rpc_timeout >= (int) watchdog_timeout) {
         restore_watchdog_timeout = true;
         cm_set_watchdog_params_local(watchdog_call, rpc_timeout + 1000);
      }
   }
 
   DWORD rpc_status = 0;
   DWORD buf_size = 0;
   char* buf = NULL;
 
   status = ss_recv_net_command(send_sock, &rpc_status, &buf_size, &buf, rpc_timeout);
 
   if (restore_watchdog_timeout) {
      cm_set_watchdog_params_local(watchdog_call, watchdog_timeout);
   }
 
   /* drop the mutex, we are done with the socket, argument unpacking is done from our own buffer */
 
   ss_mutex_release(_mutex_rpc);
 
   /* check for reply errors */
 
   if (status == SS_TIMEOUT) {
      cm_msg(MERROR, "rpc_call", "routine \"%s\": timeout waiting for reply, program abort", rpc_name);
      if (buf)
         free(buf);
      abort(); // cannot continue - our mserver is not talking to us!
      return RPC_TIMEOUT;
   }
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_call", "routine \"%s\": error, ss_recv_net_command() status %d, program abort", rpc_name, status);
      if (buf)
         free(buf);
      abort(); // cannot continue - something is wrong with our mserver connection
      return RPC_NET_ERROR;
   }
 
   if (rpc_status == RPC_INVALID_ID) {
      cm_msg(MERROR, "rpc_call", "routine \"%s\": error, unknown RPC, status %d", rpc_name, rpc_status);
      if (buf)
         free(buf);
      return rpc_status;
   }
 
   /* extract result variables and place it to argument list */
 
   va_start(ap, routine_id);
 
   status = rpc_call_decode(ap, rpc_entry, buf, buf_size);
 
   if (status != RPC_SUCCESS) {
      rpc_status = status;
   }
 
   va_end(ap);
 
   if (buf)
      free(buf);
 
   return rpc_status;
}
 
 
/********************************************************************/
INT rpc_set_opt_tcp_size(INT tcp_size) {
   INT old;
 
   old = _opt_tcp_size;
   _opt_tcp_size = tcp_size;
   return old;
}
 
INT rpc_get_opt_tcp_size() {
   return _opt_tcp_size;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT rpc_send_event(INT buffer_handle, const EVENT_HEADER *pevent, int unused, INT async_flag, INT mode)
{
   if (rpc_is_remote()) {
      return rpc_send_event1(buffer_handle, pevent);
   } else {
      return bm_send_event(buffer_handle, pevent, unused, async_flag);
   }
}
 
/********************************************************************/
INT rpc_send_event1(INT buffer_handle, const EVENT_HEADER *pevent)
{
   const size_t event_size = sizeof(EVENT_HEADER) + pevent->data_size;
   return rpc_send_event_sg(buffer_handle, 1, (char**)&pevent, &event_size);
}
 
INT rpc_send_event_sg(INT buffer_handle, int sg_n, const char* const sg_ptr[], const size_t sg_len[])
{
   if (sg_n < 1) {
      cm_msg(MERROR, "rpc_send_event_sg", "invalid sg_n %d", sg_n);
      return BM_INVALID_SIZE;
   }
 
   if (sg_ptr[0] == NULL) {
      cm_msg(MERROR, "rpc_send_event_sg", "invalid sg_ptr[0] is NULL");
      return BM_INVALID_SIZE;
   }
 
   if (sg_len[0] < sizeof(EVENT_HEADER)) {
      cm_msg(MERROR, "rpc_send_event_sg", "invalid sg_len[0] value %d is smaller than event header size %d", (int)sg_len[0], (int)sizeof(EVENT_HEADER));
      return BM_INVALID_SIZE;
   }
 
   const EVENT_HEADER* pevent = (const EVENT_HEADER*)sg_ptr[0];
   
   const DWORD MAX_DATA_SIZE = (0x7FFFFFF0 - 16); // event size computations are not 32-bit clean, limit event size to 2GB. K.O.
   const DWORD data_size = pevent->data_size; // 32-bit unsigned value
 
   if (data_size == 0) {
      cm_msg(MERROR, "rpc_send_event_sg", "invalid event data size zero");
      return BM_INVALID_SIZE;
   }
 
   if (data_size > MAX_DATA_SIZE) {
      cm_msg(MERROR, "rpc_send_event_sg", "invalid event data size %d (0x%x) maximum is %d (0x%x)", data_size, data_size, MAX_DATA_SIZE, MAX_DATA_SIZE);
      return BM_INVALID_SIZE;
   }
 
   const size_t event_size = sizeof(EVENT_HEADER) + data_size;
   const size_t total_size = ALIGN8(event_size);
 
   size_t count = 0;
   for (int i=0; i<sg_n; i++) {
      count += sg_len[i];
   }
 
   if (count != event_size) {
      cm_msg(MERROR, "rpc_send_event_sg", "data size mismatch: event data_size %d, event_size %d not same as sum of sg_len %d", (int)data_size, (int)event_size, (int)count);
      return BM_INVALID_SIZE;
   }
 
   // protect non-atomic access to _server_connection.event_sock. K.O.
   
   std::lock_guard<std::mutex> guard(_server_connection.event_sock_mutex);
 
   //printf("rpc_send_event_sg: pevent %p, event_id 0x%04x, serial 0x%08x, data_size %d, event_size %d, total_size %d\n", pevent, pevent->event_id, pevent->serial_number, (int)data_size, (int)event_size, (int)total_size);
 
   if (_server_connection.event_sock == 0) {
      return RPC_NO_CONNECTION;
   }
 
   //
   // event socket wire protocol: (see also rpc_server_receive_event() and recv_event_server_realloc())
   //
   // 4 bytes of buffer handle
   // 16 bytes of event header, includes data_size
   // ALIGN8(data_size) bytes of event data
   // 
 
   int status;
 
   /* send buffer handle */
 
   assert(sizeof(DWORD) == 4);
   DWORD bh_buf = buffer_handle;
   
   status = ss_write_tcp(_server_connection.event_sock, (const char *) &bh_buf, sizeof(DWORD));
   if (status != SS_SUCCESS) {
      ss_socket_close(&_server_connection.event_sock);
      cm_msg(MERROR, "rpc_send_event_sg", "ss_write_tcp(buffer handle) failed, event socket is now closed");
      return RPC_NET_ERROR;
   }
 
   /* send data */
 
   for (int i=0; i<sg_n; i++) {
      status = ss_write_tcp(_server_connection.event_sock, sg_ptr[i], sg_len[i]);
      if (status != SS_SUCCESS) {
         ss_socket_close(&_server_connection.event_sock);
         cm_msg(MERROR, "rpc_send_event_sg", "ss_write_tcp(event data) failed, event socket is now closed");
         return RPC_NET_ERROR;
      }
   }
 
   /* send padding */
 
   if (count < total_size) {
      char padding[8] = { 0,0,0,0,0,0,0,0 };
      size_t padlen = total_size - count;
      assert(padlen < 8);
      status = ss_write_tcp(_server_connection.event_sock, padding, padlen);
      if (status != SS_SUCCESS) {
         ss_socket_close(&_server_connection.event_sock);
         cm_msg(MERROR, "rpc_send_event_sg", "ss_write_tcp(padding) failed, event socket is now closed");
         return RPC_NET_ERROR;
      }
   }
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_flush_event() {
   return RPC_SUCCESS;
}
 
/********************************************************************/
 
struct TR_FIFO {
   int transition = 0;
   int run_number = 0;
   time_t trans_time = 0;
   int sequence_number = 0;
};
 
static std::mutex _tr_fifo_mutex;
static TR_FIFO _tr_fifo[10];
static int _tr_fifo_wp = 0;
static int _tr_fifo_rp = 0;
 
static INT rpc_transition_dispatch(INT idx, void *prpc_param[])
/********************************************************************\
 
  Routine: rpc_transition_dispatch
 
  Purpose: Gets called when a transition function was registered and
           a transition occured. Internal use only.
 
  Input:
    INT    idx              RPC function ID
    void   *prpc_param      RPC parameters
 
  Output:
    none
 
  Function value:
    INT    return value from called user routine
 
\********************************************************************/
{
   /* erase error string */
   *(CSTRING(2)) = 0;
 
   if (idx == RPC_RC_TRANSITION) {
      // find registered handler
      // NB: this code should match same code in cm_transition_call_direct()
      // NB: only use the first handler, this is how MIDAS always worked
      // NB: we could run all handlers, but we can return the status and error string of only one of them.
      _trans_table_mutex.lock();
      size_t n = _trans_table.size();
      _trans_table_mutex.unlock();
         
      for (size_t i = 0; i < n; i++) {
         _trans_table_mutex.lock();
         TRANS_TABLE tt = _trans_table[i];
         _trans_table_mutex.unlock();
         
         if (tt.transition == CINT(0) && tt.sequence_number == CINT(4)) {
            if (tt.func) {
               /* execute callback if defined */
               return tt.func(CINT(1), CSTRING(2));
            } else {
               std::lock_guard<std::mutex> guard(_tr_fifo_mutex);
               /* store transition in FIFO */
               _tr_fifo[_tr_fifo_wp].transition = CINT(0);
               _tr_fifo[_tr_fifo_wp].run_number = CINT(1);
               _tr_fifo[_tr_fifo_wp].trans_time = time(NULL);
               _tr_fifo[_tr_fifo_wp].sequence_number = CINT(4);
               _tr_fifo_wp = (_tr_fifo_wp + 1) % 10;
               // implicit unlock
               return RPC_SUCCESS;
            }
         }
      }
      // no handler for this transition
      cm_msg(MERROR, "rpc_transition_dispatch", "no handler for transition %d with sequence number %d", CINT(0), CINT(4));
      return CM_SUCCESS;
   } else {
      cm_msg(MERROR, "rpc_transition_dispatch", "received unrecognized command %d", idx);
      return RPC_INVALID_ID;
   }
}
 
/********************************************************************/
int cm_query_transition(int *transition, int *run_number, int *trans_time)
/********************************************************************\
 
  Routine: cm_query_transition
 
  Purpose: Query system if transition has occured. Normally, one
           registers callbacks for transitions via
           cm_register_transition. In some environments however,
           callbacks are not possible. In that case one spciefies
           a NULL pointer as the callback routine and can query
           transitions "manually" by calling this functions. A small
           FIFO takes care that no transition is lost if this functions
           did not get called between some transitions.
 
  Output:
    INT   *transition        Type of transition, one of TR_xxx
    INT   *run_nuber         Run number for transition
    time_t *trans_time       Time (in UNIX time) of transition
 
  Function value:
    FALSE  No transition occured since last call
    TRUE   Transition occured
 
\********************************************************************/
{
   std::lock_guard<std::mutex> guard(_tr_fifo_mutex);
 
   if (_tr_fifo_wp == _tr_fifo_rp)
      return FALSE;
 
   if (transition)
      *transition = _tr_fifo[_tr_fifo_rp].transition;
 
   if (run_number)
      *run_number = _tr_fifo[_tr_fifo_rp].run_number;
 
   if (trans_time)
      *trans_time = (int) _tr_fifo[_tr_fifo_rp].trans_time;
 
   _tr_fifo_rp = (_tr_fifo_rp + 1) % 10;
 
   // implicit unlock
   return TRUE;
}
 
/********************************************************************\
*                        server functions                            *
\********************************************************************/
 
#if 0
void debug_dump(unsigned char *p, int size)
{
   int i, j;
   unsigned char c;
 
   for (i = 0; i < (size - 1) / 16 + 1; i++) {
      printf("%p ", p + i * 16);
      for (j = 0; j < 16; j++)
         if (i * 16 + j < size)
            printf("%02X ", p[i * 16 + j]);
         else
            printf("   ");
      printf(" ");
 
      for (j = 0; j < 16; j++) {
         c = p[i * 16 + j];
         if (i * 16 + j < size)
            printf("%c", (c >= 32 && c < 128) ? p[i * 16 + j] : '.');
      }
      printf("\n");
   }
 
   printf("\n");
}
#endif
 
/********************************************************************/
static int recv_net_command_realloc(INT idx, char **pbuf, int *pbufsize, INT *remaining)
/********************************************************************\
 
  Routine: recv_net_command
 
  Purpose: TCP receive routine with local cache. To speed up network
           performance, a 64k buffer is read in at once and split into
           several RPC command on successive calls to recv_net_command.
           Therefore, the number of recv() calls is minimized.
 
           This routine is ment to be called by the server process.
           Clients should call recv_tcp instead.
 
  Input:
    INT   idx                Index of server connection
    DWORD buffer_size        Size of the buffer in bytes.
    INT   flags              Flags passed to recv()
    INT   convert_flags      Convert flags needed for big/little
                             endian conversion
 
  Output:
    char  *buffer            Network receive buffer.
    INT   *remaining         Remaining data in cache
 
  Function value:
    INT                      Same as recv()
 
\********************************************************************/
{
   char *buffer = NULL; // buffer is changed to point to *pbuf when we receive the NET_COMMAND header
 
   RPC_SERVER_ACCEPTION* sa = rpc_get_server_acception(idx);
 
   int sock = sa->recv_sock;
 
   if (!sa->net_buffer) {
      if (sa->is_mserver)
         sa->net_buffer_size = NET_TCP_SIZE;
      else
         sa->net_buffer_size = NET_BUFFER_SIZE;
 
      sa->net_buffer = (char *) malloc(sa->net_buffer_size);
      //printf("sa %p idx %d, net_buffer %p+%d\n", sa, idx, sa->net_buffer, sa->net_buffer_size);
      sa->write_ptr = 0;
      sa->read_ptr = 0;
      sa->misalign = 0;
   }
   if (!sa->net_buffer) {
      cm_msg(MERROR, "recv_net_command", "Cannot allocate %d bytes for network buffer", sa->net_buffer_size);
      return -1;
   }
 
   int copied = 0;
   int param_size = -1;
 
   int write_ptr = sa->write_ptr;
   int read_ptr = sa->read_ptr;
   int misalign = sa->misalign;
   char *net_buffer = sa->net_buffer;
 
   do {
      if (write_ptr - read_ptr >= (INT) sizeof(NET_COMMAND_HEADER) - copied) {
         if (param_size == -1) {
            if (copied > 0) {
               /* assemble split header */
               memcpy(buffer + copied, net_buffer + read_ptr, (INT) sizeof(NET_COMMAND_HEADER) - copied);
               NET_COMMAND *nc = (NET_COMMAND *) (buffer);
               param_size = (INT) nc->header.param_size;
            } else {
               NET_COMMAND *nc = (NET_COMMAND *) (net_buffer + read_ptr);
               param_size = (INT) nc->header.param_size;
            }
 
            if (sa->convert_flags)
               rpc_convert_single(&param_size, TID_UINT32, 0, sa->convert_flags);
         }
 
         //printf("recv_net_command: param_size %d, NET_COMMAND_HEADER %d, buffer_size %d\n", param_size, (int)sizeof(NET_COMMAND_HEADER), *pbufsize);
 
         /* check if parameters fit in buffer */
         if (*pbufsize < (param_size + (int) sizeof(NET_COMMAND_HEADER))) {
            int new_size = param_size + sizeof(NET_COMMAND_HEADER) + 1024;
            char *p = (char *) realloc(*pbuf, new_size);
            //printf("recv_net_command: reallocate buffer %d -> %d, %p\n", *pbufsize, new_size, p);
            if (p == NULL) {
               cm_msg(MERROR, "recv_net_command", "cannot reallocate buffer from %d bytes to %d bytes", *pbufsize, new_size);
               sa->read_ptr = 0;
               sa->write_ptr = 0;
               return -1;
            }
            *pbuf = p;
            *pbufsize = new_size;
         }
 
         buffer = *pbuf;
 
         /* check if we have all parameters in buffer */
         if (write_ptr - read_ptr >= param_size + (INT) sizeof(NET_COMMAND_HEADER) - copied)
            break;
      }
 
      /* not enough data, so copy partially and get new */
      int size = write_ptr - read_ptr;
 
      if (size > 0) {
         memcpy(buffer + copied, net_buffer + read_ptr, size);
         copied += size;
         read_ptr = write_ptr;
      }
#ifdef OS_UNIX
      do {
         write_ptr = recv(sock, net_buffer + misalign, sa->net_buffer_size - 8, 0);
 
         /* don't return if an alarm signal was cought */
      } while (write_ptr == -1 && errno == EINTR);
#else
      write_ptr = recv(sock, net_buffer + misalign, sa->net_buffer_size - 8, 0);
#endif
 
      /* abort if connection broken */
      if (write_ptr <= 0) {
         if (write_ptr == 0)
            cm_msg(MERROR, "recv_net_command", "rpc connection from \'%s\' on \'%s\' unexpectedly closed", sa->prog_name.c_str(), sa->host_name.c_str());
         else
            cm_msg(MERROR, "recv_net_command", "recv() returned %d, errno: %d (%s)", write_ptr, errno, strerror(errno));
 
         if (remaining)
            *remaining = 0;
 
         return write_ptr;
      }
 
      read_ptr = misalign;
      write_ptr += misalign;
 
      misalign = write_ptr % 8;
   } while (TRUE);
 
   /* copy rest of parameters */
   int size = param_size + sizeof(NET_COMMAND_HEADER) - copied;
   memcpy(buffer + copied, net_buffer + read_ptr, size);
   read_ptr += size;
 
   if (remaining) {
      /* don't keep rpc_server_receive in an infinite loop */
      if (write_ptr - read_ptr < param_size)
         *remaining = 0;
      else
         *remaining = write_ptr - read_ptr;
   }
 
   sa->write_ptr = write_ptr;
   sa->read_ptr = read_ptr;
   sa->misalign = misalign;
 
   return size + copied;
}
 
 
/********************************************************************/
INT recv_tcp_check(int sock)
/********************************************************************\
 
  Routine: recv_tcp_check
 
  Purpose: Check if in TCP receive buffer associated with sock is
           some data. Called by ss_suspend.
 
  Input:
    INT   sock               TCP receive socket
 
  Output:
    none
 
  Function value:
    INT   count              Number of bytes remaining in TCP buffer
 
\********************************************************************/
{
   /* figure out to which connection socket belongs */
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++)
      if (_server_acceptions[idx] && _server_acceptions[idx]->recv_sock == sock) {
         return _server_acceptions[idx]->write_ptr - _server_acceptions[idx]->read_ptr;
      }
 
   return 0;
}
 
 
/********************************************************************/
static int recv_event_server_realloc(INT idx, RPC_SERVER_ACCEPTION* psa, char **pbuffer, int *pbuffer_size)
/********************************************************************\
 
  Routine: recv_event_server_realloc
 
  Purpose: receive events sent by rpc_send_event()
 
  Input:
    INT   idx                Index of server connection
    DWORD buffer_size        Size of the buffer in bytes.
    INT   flags              Flags passed to recv()
    INT   convert_flags      Convert flags needed for big/little
                             endian conversion
 
  Output:
    char  *buffer            Network receive buffer.
    INT   *remaining         Remaining data in cache
 
  Function value:
    INT                      Same as recv()
 
\********************************************************************/
{
   int sock = psa->event_sock;
 
   //printf("recv_event_server: idx %d, buffer %p, buffer_size %d\n", idx, buffer, buffer_size);
 
   const size_t header_size = (sizeof(EVENT_HEADER) + sizeof(INT));
 
   char header_buf[header_size];
 
   // First read the header.
   //
   // Data format is:
   // INT buffer handle (4 bytes)
   // EVENT_HEADER (16 bytes)
   // event data
   // ALIGN8() padding
   // ...next event
 
   int hrd = recv_tcp2(sock, header_buf, header_size, 1);
 
   if (hrd == 0) {
      // timeout waiting for data
      return 0;
   }
 
   /* abort if connection broken */
   if (hrd < 0) {
      cm_msg(MERROR, "recv_event_server", "recv_tcp2(header) returned %d", hrd);
      return -1;
   }
 
   if (hrd < (int) header_size) {
      int hrd1 = recv_tcp2(sock, header_buf + hrd, header_size - hrd, 0);
 
      /* abort if connection broken */
      if (hrd1 <= 0) {
         cm_msg(MERROR, "recv_event_server", "recv_tcp2(more header) returned %d", hrd1);
         return -1;
      }
 
      hrd += hrd1;
   }
 
   /* abort if connection broken */
   if (hrd != (int) header_size) {
      cm_msg(MERROR, "recv_event_server", "recv_tcp2(header) returned %d instead of %d", hrd, (int) header_size);
      return -1;
   }
 
   INT *pbh = (INT *) header_buf;
   EVENT_HEADER *pevent = (EVENT_HEADER *) (((INT *) header_buf) + 1);
 
   /* convert header little endian/big endian */
   if (psa->convert_flags) {
      rpc_convert_single(&pbh, TID_INT32, 0, psa->convert_flags);
      rpc_convert_single(&pevent->event_id, TID_INT16, 0, psa->convert_flags);
      rpc_convert_single(&pevent->trigger_mask, TID_INT16, 0, psa->convert_flags);
      rpc_convert_single(&pevent->serial_number, TID_UINT32, 0, psa->convert_flags);
      rpc_convert_single(&pevent->time_stamp, TID_UINT32, 0, psa->convert_flags);
      rpc_convert_single(&pevent->data_size, TID_UINT32, 0, psa->convert_flags);
   }
 
   int event_size = pevent->data_size + sizeof(EVENT_HEADER);
   int total_size = ALIGN8(event_size);
 
   //printf("recv_event_server: buffer_handle %d, event_id 0x%04x, serial 0x%08x, data_size %d, event_size %d, total_size %d\n", *pbh, pevent->event_id, pevent->serial_number, pevent->data_size, event_size, total_size);
 
   if (pevent->data_size == 0) {
      for (int i=0; i<5; i++) {
         printf("recv_event_server: header[%d]: 0x%08x\n", i, pbh[i]);
      }
      abort();
   }
 
   /* check for sane event size */
   if (event_size <= 0 || total_size <= 0) {
      cm_msg(MERROR, "recv_event_server",
             "received event header with invalid data_size %d: event_size %d, total_size %d", pevent->data_size,
             event_size, total_size);
      return -1;
   }
 
   //printf("recv_event_server: idx %d, bh %d, event header: id %d, mask %d, serial %d, data_size %d, event_size %d, total_size %d\n", idx, *pbh, pevent->event_id, pevent->trigger_mask, pevent->serial_number, pevent->data_size, event_size, total_size);
 
 
   int bufsize = sizeof(INT) + total_size;
 
   // Second, check that output buffer is big enough
 
   /* check if data part fits in buffer */
   if (*pbuffer_size < bufsize) {
      int newsize = 1024 + ALIGN8(bufsize);
 
      //printf("recv_event_server: buffer realloc %d -> %d\n", *pbuffer_size, newsize);
 
      char *newbuf = (char *) realloc(*pbuffer, newsize);
      if (newbuf == NULL) {
         cm_msg(MERROR, "recv_event_server", "cannot realloc() event buffer from %d to %d bytes", *pbuffer_size,
                newsize);
         return -1;
      }
      *pbuffer = newbuf;
      *pbuffer_size = newsize;
   }
 
   // Third, copy header into output buffer
 
   memcpy(*pbuffer, header_buf, header_size);
 
   // Forth, read the event data
 
   int to_read = sizeof(INT) + total_size - header_size;
   int rptr = header_size;
 
   if (to_read > 0) {
      int drd = recv_tcp2(sock, (*pbuffer) + rptr, to_read, 0);
 
      /* abort if connection broken */
      if (drd <= 0) {
         cm_msg(MERROR, "recv_event_server", "recv_tcp2(data) returned %d instead of %d", drd, to_read);
         return -1;
      }
   }
 
   return bufsize;
}
 
 
/********************************************************************/
INT rpc_register_server(int port, int *plsock, int *pport)
/********************************************************************\
 
  Routine: rpc_register_listener
 
  Purpose: Register the calling process as a MIDAS RPC server. Note
           that cm_connnect_experiment must be called prior to any call of
           rpc_register_server.
 
  Input:
    INT   port              TCP port for listen. If port==0, the OS chooses a free port and returns it in *pport
 
  Output:
    int   *plsock           Listener socket, can be NULL
    int   *pport            Port under which server is listening, can be NULL
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_NOT_REGISTERED      cm_connect_experiment was not called
 
\********************************************************************/
{
   int status;
   int lsock;
 
   status = rpc_register_listener(port, NULL, &lsock, pport);
   if (status != RPC_SUCCESS)
      return status;
 
   status = ss_suspend_set_client_listener(lsock);
   if (status != SS_SUCCESS)
      return status;
 
   if (plsock)
      *plsock = lsock;
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_register_listener(int port, RPC_HANDLER func, int *plsock, int *pport)
/********************************************************************\
 
  Routine: rpc_register_listener
 
  Purpose: Register the calling process as a MIDAS RPC server. Note
           that cm_connnect_experiment must be called prior to any call of
           rpc_register_listener.
 
  Input:
    INT   port              TCP port for listen. If port==0, the OS chooses a free port and returns it in *pport
    INT   *func             Default dispatch function
 
  Output:
    int   *plsock           Listener socket, should not be NULL
    int   *pport            Port under which server is listening, can be NULL
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_NOT_REGISTERED      cm_connect_experiment was not called
 
\********************************************************************/
{
   /* register system functions: RPC_ID_EXIT, RPC_ID_SHUTDOWN, RPC_ID_WATCHDOG */
   rpc_register_functions(rpc_get_internal_list(0), func);
 
   /* create a socket for listening */
   int lsock = 0;
   int lport = 0;
   std::string errmsg;
 
   int status = ss_socket_listen_tcp(!disable_bind_rpc_to_localhost, port, &lsock, &lport, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_register_server", "cannot listen to tcp port %d: %s", port, errmsg.c_str());
      return RPC_NET_ERROR;
   }
 
   /* set close-on-exec flag to prevent child mserver processes from inheriting the listen socket */
#if defined(F_SETFD) && defined(FD_CLOEXEC)
   status = fcntl(lsock, F_SETFD, fcntl(lsock, F_GETFD) | FD_CLOEXEC);
   if (status < 0) {
      cm_msg(MERROR, "rpc_register_server", "fcntl(F_SETFD, FD_CLOEXEC) failed, errno %d (%s)", errno, strerror(errno));
      return RPC_NET_ERROR;
   }
#endif
 
   /* return port wich OS has choosen */
   if (pport) {
      *pport = lport;
   }
 
   if (plsock)
      *plsock = lsock;
 
   //printf("rpc_register_server: requested port %d, actual port %d, socket %d\n", port, *pport, *plsock);
 
   return RPC_SUCCESS;
}
 
typedef struct {
   midas_thread_t thread_id;
   int buffer_size;
   char *buffer;
} TLS_POINTER;
 
static TLS_POINTER *tls_buffer = NULL;
static int tls_size = 0;
 
/********************************************************************/
INT rpc_execute(INT sock, char *buffer, INT convert_flags)
/********************************************************************\
 
  Routine: rpc_execute
 
  Purpose: Execute a RPC command received over the network
 
  Input:
    INT  sock               TCP socket to which the result should be
                            send back
 
    char *buffer            Command buffer
    INT  convert_flags      Flags for data conversion
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_INVALID_ID          Invalid routine_id received
    RPC_NET_ERROR           Error in socket call
    RPC_EXCEED_BUFFER       Not enough memory for network buffer
    RPC_SHUTDOWN            Shutdown requested
    SS_ABORT                TCP connection broken
    SS_EXIT                 TCP connection closed
 
\********************************************************************/
{
   INT i, routine_id, status;
   char *in_param_ptr, *out_param_ptr, *last_param_ptr;
   INT tid, flags;
   NET_COMMAND *nc_in, *nc_out;
   INT param_size, max_size;
   void *prpc_param[20];
   char debug_line[1024], *return_buffer;
   int return_buffer_size;
   int return_buffer_tls;
#ifdef FIXED_BUFFER
   int initial_buffer_size = NET_BUFFER_SIZE;
#else
   int initial_buffer_size = 1024;
#endif
 
   /* return buffer must must use thread local storage multi-thread servers */
   if (!tls_size) {
      tls_buffer = (TLS_POINTER *) malloc(sizeof(TLS_POINTER));
      tls_buffer[tls_size].thread_id = ss_gettid();
      tls_buffer[tls_size].buffer_size = initial_buffer_size;
      tls_buffer[tls_size].buffer = (char *) malloc(tls_buffer[tls_size].buffer_size);
      tls_size = 1;
   }
   for (i = 0; i < tls_size; i++)
      if (tls_buffer[i].thread_id == ss_gettid())
         break;
   if (i == tls_size) {
      /* new thread -> allocate new buffer */
      tls_buffer = (TLS_POINTER *) realloc(tls_buffer, (tls_size + 1) * sizeof(TLS_POINTER));
      tls_buffer[tls_size].thread_id = ss_gettid();
      tls_buffer[tls_size].buffer_size = initial_buffer_size;
      tls_buffer[tls_size].buffer = (char *) malloc(tls_buffer[tls_size].buffer_size);
      tls_size++;
   }
 
   return_buffer_tls = i;
   return_buffer_size = tls_buffer[i].buffer_size;
   return_buffer = tls_buffer[i].buffer;
   assert(return_buffer);
 
   // make valgrind happy - the RPC parameter encoder skips the alignement padding bytes
   // and valgrind complains that we transmit uninitialized data
   //memset(return_buffer, 0, return_buffer_size);
 
   /* extract pointer array to parameters */
   nc_in = (NET_COMMAND *) buffer;
 
   /* convert header format (byte swapping) */
   if (convert_flags) {
      rpc_convert_single(&nc_in->header.routine_id, TID_UINT32, 0, convert_flags);
      rpc_convert_single(&nc_in->header.param_size, TID_UINT32, 0, convert_flags);
   }
 
   //if (nc_in->header.routine_id & RPC_NO_REPLY) {
   //   printf("rpc_execute: routine_id %d, RPC_NO_REPLY\n", (int)(nc_in->header.routine_id & ~RPC_NO_REPLY));
   //}
 
   /* no result return as requested */
   if (nc_in->header.routine_id & RPC_NO_REPLY)
      sock = 0;
 
   /* find entry in rpc_list */
   routine_id = nc_in->header.routine_id & ~RPC_NO_REPLY;
 
   int idx = -1;
   RPC_LIST rl;
 
   rpc_list_mutex.lock();
 
   for (size_t i = 0; i < rpc_list.size(); i++) {
      if (rpc_list[i].id == routine_id) {
         idx = i;
         rl = rpc_list[idx];
         break;
      }
   }
 
   rpc_list_mutex.unlock();
 
   if (idx < 0) {
      cm_msg(MERROR, "rpc_execute", "Invalid rpc ID (%d)", routine_id);
      return RPC_INVALID_ID;
   }
 
   again:
 
   in_param_ptr = nc_in->param;
 
   nc_out = (NET_COMMAND *) return_buffer;
   out_param_ptr = nc_out->param;
 
   sprintf(debug_line, "%s(", rl.name);
 
   for (i = 0; rl.param[i].tid != 0; i++) {
      tid = rl.param[i].tid;
      flags = rl.param[i].flags;
 
      if (flags & RPC_IN) {
         param_size = ALIGN8(rpc_tid_size(tid));
 
         if (tid == TID_STRING || tid == TID_LINK)
            param_size = ALIGN8(1 + strlen((char *) (in_param_ptr)));
 
         if (flags & RPC_VARARRAY) {
            /* for arrays, the size is stored as a INT in front of the array */
            param_size = *((INT *) in_param_ptr);
            if (convert_flags)
               rpc_convert_single(&param_size, TID_INT32, 0, convert_flags);
            param_size = ALIGN8(param_size);
 
            in_param_ptr += ALIGN8(sizeof(INT));
         }
 
         if (tid == TID_STRUCT)
            param_size = ALIGN8(rl.param[i].n);
 
         prpc_param[i] = in_param_ptr;
 
         /* convert data format */
         if (convert_flags) {
            if (flags & RPC_VARARRAY)
               rpc_convert_data(in_param_ptr, tid, flags, param_size, convert_flags);
            else
               rpc_convert_data(in_param_ptr, tid, flags, rl.param[i].n * rpc_tid_size(tid),
                                convert_flags);
         }
 
         std::string str = db_sprintf(in_param_ptr, param_size, 0, rl.param[i].tid);
         if (rl.param[i].tid == TID_STRING) {
            /* check for long strings (db_create_record...) */
            if (strlen(debug_line) + str.length() + 2 < sizeof(debug_line)) {
               strcat(debug_line, "\"");
               strcat(debug_line, str.c_str());
               strcat(debug_line, "\"");
            } else
               strcat(debug_line, "...");
         } else
            strcat(debug_line, str.c_str());
 
         in_param_ptr += param_size;
      }
 
      if (flags & RPC_OUT) {
         param_size = ALIGN8(rpc_tid_size(tid));
 
         if (flags & RPC_VARARRAY || tid == TID_STRING) {
 
            /* save maximum array length from the value of the next argument.
             * this means RPC_OUT arrays and strings should always be passed like this:
             * rpc_call(..., array_ptr, array_max_size, ...); */
 
            max_size = *((INT *) in_param_ptr);
 
            if (convert_flags)
               rpc_convert_single(&max_size, TID_INT32, 0, convert_flags);
            max_size = ALIGN8(max_size);
 
            *((INT *) out_param_ptr) = max_size;
 
            /* save space for return array length */
            out_param_ptr += ALIGN8(sizeof(INT));
 
            /* use maximum array length from input */
            param_size = max_size;
         }
 
         if (rl.param[i].tid == TID_STRUCT)
            param_size = ALIGN8(rl.param[i].n);
 
         if ((POINTER_T) out_param_ptr - (POINTER_T) nc_out + param_size > return_buffer_size) {
#ifdef FIXED_BUFFER
            cm_msg(MERROR, "rpc_execute",
                   "return parameters (%d) too large for network buffer (%d)",
                   (POINTER_T) out_param_ptr - (POINTER_T) nc_out + param_size, return_buffer_size);
 
            return RPC_EXCEED_BUFFER;
#else
            int itls;
            int new_size = (POINTER_T) out_param_ptr - (POINTER_T) nc_out + param_size + 1024;
 
#if 0
            cm_msg(MINFO, "rpc_execute",
                      "rpc_execute: return parameters (%d) too large for network buffer (%d), new buffer size (%d)",
                      (int)((POINTER_T) out_param_ptr - (POINTER_T) nc_out + param_size), return_buffer_size, new_size);
#endif
 
            itls = return_buffer_tls;
 
            tls_buffer[itls].buffer_size = new_size;
            tls_buffer[itls].buffer = (char *) realloc(tls_buffer[itls].buffer, new_size);
 
            if (!tls_buffer[itls].buffer) {
               cm_msg(MERROR, "rpc_execute", "Cannot allocate return buffer of size %d", new_size);
               return RPC_EXCEED_BUFFER;
            }
 
            return_buffer_size = tls_buffer[itls].buffer_size;
            return_buffer = tls_buffer[itls].buffer;
            assert(return_buffer);
 
            goto again;
#endif
         }
 
         /* if parameter goes both directions, copy input to output */
         if (rl.param[i].flags & RPC_IN)
            memcpy(out_param_ptr, prpc_param[i], param_size);
 
         if (_debug_print && !(flags & RPC_IN))
            strcat(debug_line, "-");
 
         prpc_param[i] = out_param_ptr;
         out_param_ptr += param_size;
      }
 
      if (rl.param[i + 1].tid)
         strcat(debug_line, ", ");
   }
 
   //printf("predicted return size %d\n", (POINTER_T) out_param_ptr - (POINTER_T) nc_out);
 
   strcat(debug_line, ")");
   rpc_debug_printf(debug_line);
 
   last_param_ptr = out_param_ptr;
 
   /*********************************\
   *   call dispatch function        *
   \*********************************/
   if (rl.dispatch)
      status = rl.dispatch(routine_id, prpc_param);
   else
      status = RPC_INVALID_ID;
 
   if (routine_id == RPC_ID_EXIT || routine_id == RPC_ID_SHUTDOWN || routine_id == RPC_ID_WATCHDOG)
      status = RPC_SUCCESS;
 
   /* return immediately for closed down client connections */
   if (!sock && routine_id == RPC_ID_EXIT)
      return SS_EXIT;
 
   if (!sock && routine_id == RPC_ID_SHUTDOWN)
      return RPC_SHUTDOWN;
 
   /* Return if TCP connection broken */
   if (status == SS_ABORT)
      return SS_ABORT;
 
   /* if sock == 0, we are in FTCP mode and may not sent results */
   if (!sock)
      return RPC_SUCCESS;
 
   /* compress variable length arrays */
   out_param_ptr = nc_out->param;
   for (i = 0; rl.param[i].tid != 0; i++)
      if (rl.param[i].flags & RPC_OUT) {
         tid = rl.param[i].tid;
         flags = rl.param[i].flags;
         param_size = ALIGN8(rpc_tid_size(tid));
 
         if (tid == TID_STRING) {
            max_size = *((INT *) out_param_ptr);
            // note: RPC_OUT parameters may have been shifted in the output buffer by memmove()
            // and prpc_param() is now pointing to the wrong place. here we know our string data
            // starts right after max_size and we do not need to use prpc_param[] to find it. K.O.
            //const char* param_ptr = (char *) prpc_param[i];
            const char* param_ptr = ((char *) out_param_ptr) + ALIGN8(sizeof(INT));
            //printf("string param [%s] max_size %d\n", param_ptr, max_size);
            param_size = strlen(param_ptr) + 1;
            param_size = ALIGN8(param_size);
 
            /* move string ALIGN8(sizeof(INT)) left */
            memmove(out_param_ptr, out_param_ptr + ALIGN8(sizeof(INT)), param_size);
 
            /* move remaining parameters to end of string */
            memmove(out_param_ptr + param_size,
                    out_param_ptr + max_size + ALIGN8(sizeof(INT)),
                    (POINTER_T) last_param_ptr - ((POINTER_T) out_param_ptr + max_size + ALIGN8(sizeof(INT))));
         }
 
         if (flags & RPC_VARARRAY) {
            /* store array length at current out_param_ptr */
            max_size = *((INT *) out_param_ptr);
            // note: RPC_OUT parameters may have been shifted in the output buffer by memmove()
            // and prpc_param() is now pointing to the wrong place. instead, compute location
            // of next parameter using max_size. K.O.
            // note: RPC_IN parameters are in the input buffer and we must use the prpc_param[] pointer. K.O.
            if (rl.param[i+1].flags & RPC_OUT)
               param_size = *((INT *) (out_param_ptr + ALIGN8(sizeof(INT)) + ALIGN8(max_size)));
            else
               param_size = *((INT *) prpc_param[i + 1]);
            *((INT *) out_param_ptr) = param_size;      // store new array size
            if (convert_flags)
               rpc_convert_single(out_param_ptr, TID_INT32, RPC_OUTGOING, convert_flags);
 
            out_param_ptr += ALIGN8(sizeof(INT));       // step over array size
 
            param_size = ALIGN8(param_size);
 
            /* move remaining parameters to end of array */
            memmove(out_param_ptr + param_size,
                    out_param_ptr + max_size,
                    (POINTER_T) last_param_ptr - ((POINTER_T) out_param_ptr + max_size));
         }
 
         if (tid == TID_STRUCT)
            param_size = ALIGN8(rl.param[i].n);
 
         /* convert data format */
         if (convert_flags) {
            if (flags & RPC_VARARRAY)
               rpc_convert_data(out_param_ptr, tid,
                                rl.param[i].flags | RPC_OUTGOING, param_size, convert_flags);
            else
               rpc_convert_data(out_param_ptr, tid,
                                rl.param[i].flags | RPC_OUTGOING,
                                rl.param[i].n * rpc_tid_size(tid), convert_flags);
         }
 
         out_param_ptr += param_size;
      }
 
   /* send return parameters */
   param_size = (POINTER_T) out_param_ptr - (POINTER_T) nc_out->param;
   nc_out->header.routine_id = status;
   nc_out->header.param_size = param_size;
 
   //printf("actual return size %d, buffer used %d\n", (POINTER_T) out_param_ptr - (POINTER_T) nc_out, sizeof(NET_COMMAND_HEADER) + param_size);
 
   /* convert header format (byte swapping) if necessary */
   if (convert_flags) {
      rpc_convert_single(&nc_out->header.routine_id, TID_UINT32, RPC_OUTGOING, convert_flags);
      rpc_convert_single(&nc_out->header.param_size, TID_UINT32, RPC_OUTGOING, convert_flags);
   }
 
   // valgrind complains about sending uninitialized data, if you care about this, uncomment
   // the memset(return_buffer,0) call above (search for "valgrind"). K.O.
 
   status = send_tcp(sock, return_buffer, sizeof(NET_COMMAND_HEADER) + param_size, 0);
 
   if (status < 0) {
      cm_msg(MERROR, "rpc_execute", "send_tcp() failed");
      return RPC_NET_ERROR;
   }
 
   /* print return buffer */
/*
  printf("Return buffer, ID %d:\n", routine_id);
  for (i=0; i<param_size ; i++)
    {
    status = (char) nc_out->param[i];
    printf("%02X ", status);
    if (i%8 == 7)
      printf("\n");
    }
*/
   /* return SS_EXIT if RPC_EXIT is called */
   if (routine_id == RPC_ID_EXIT)
      return SS_EXIT;
 
   /* return SS_SHUTDOWN if RPC_SHUTDOWN is called */
   if (routine_id == RPC_ID_SHUTDOWN)
      return RPC_SHUTDOWN;
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
int rpc_test_rpc()
/********************************************************************\
  Routine: rpc_test_rpc
 
  Purpose: Test RPC parameters encoding and decoding
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   int status = RPC_SUCCESS;
 
   printf("rpc_test_rpc!\n");
 
   int int_out = 0;
   int int_inout = 456;
   
   char string_out[32];
   char string2_out[48];
 
   char string_inout[25];
   strcpy(string_inout, "string_inout");
 
   KEY struct_in;
 
   struct_in.type = 111;
   struct_in.num_values = 222;
   strcpy(struct_in.name, "name");
   struct_in.last_written = 333;
   
   KEY struct_out;
   KEY struct_inout;
 
   struct_inout.type = 111111;
   struct_inout.num_values = 222222;
   strcpy(struct_inout.name, "name_name");
   struct_inout.last_written = 333333;
 
   uint32_t dwordarray_inout[10];
   size_t dwordarray_inout_size = sizeof(dwordarray_inout);
 
   for (int i=0; i<10; i++) {
      dwordarray_inout[i] = i*10;
   }
 
   char array_in[10];
 
   for (size_t i=0; i<sizeof(array_in); i++) {
      array_in[i] = 'a' + i;
   }
   
   char array_out[16];
   size_t array_out_size = sizeof(array_out);
 
   status = rpc_call(RPC_TEST2,
                     123,
                     &int_out,
                     &int_inout,
                     "test string",
                     string_out, sizeof(string_out),
                     string2_out, sizeof(string2_out),
                     string_inout, sizeof(string_inout),
                     &struct_in,
                     &struct_out,
                     &struct_inout,
                     dwordarray_inout, &dwordarray_inout_size,
                     array_in, sizeof(array_in),
                     array_out, &array_out_size
                     );
 
   printf("rpc_call(RPC_TEST2) status %d\n", status);
 
   if (int_out != 789) {
      printf("int_out mismatch!\n");
      status = 0;
   }
 
   if (int_inout != 456*2) {
      printf("int_inout mismatch!\n");
      status = 0;
   }
 
   if (strcmp(string_out, "string_out") != 0) {
      printf("string_out mismatch [%s] vs [%s]\n", string_out, "string_out");
      status = 0;
   }
 
   if (strcmp(string2_out, "second string_out") != 0) {
      printf("string2_out mismatch [%s] vs [%s]\n", string2_out, "second string_out");
      status = 0;
   }
 
   if (strcmp(string_inout, "return string_inout") != 0) {
      printf("string_inout mismatch [%s] vs [%s]\n", string_inout, "return string_inout");
      status = 0;
   }
 
   KEY* pkey;
 
   pkey = &struct_in;
 
   //printf("struct_in: type %d, num_values %d, name [%s], last_written %d\n", pkey->type, pkey->num_values, pkey->name, pkey->last_written);
 
   pkey = &struct_out;
 
   if (pkey->type != 444 || pkey->num_values != 555 || strcmp(pkey->name, "out_name") || pkey->last_written != 666) {
      printf("struct_out mismatch: type %d, num_values %d, name [%s], last_written %d\n", pkey->type, pkey->num_values, pkey->name, pkey->last_written);
      status = 0;
   }
 
   pkey = &struct_inout;
 
   if (pkey->type != 444444 || pkey->num_values != 555555 || strcmp(pkey->name, "inout_name") || pkey->last_written != 666666) {
      printf("struct_inout mismatch: type %d, num_values %d, name [%s], last_written %d\n", pkey->type, pkey->num_values, pkey->name, pkey->last_written);
      status = 0;
   }
 
#if 0
   if (dwordarray_inout_size != 4*5) {
      printf("dwordarray_inout_size mismatch %d vs %d\n", (int)dwordarray_inout_size, 4*5);
      status = 0;
   }
 
   for (size_t i=0; i<dwordarray_inout_size/sizeof(uint32_t); i++) {
      printf("dwordarray_inout[%d] is %d\n", (int)i, dwordarray_inout[i]);
   }
#endif
 
#if 0
   {RPC_TEST_CXX, "test_cxx",
    {{TID_INT32, RPC_IN},
     {TID_INT32, RPC_IN | RPC_OUT | RPC_VARARRAY | RPC_CXX},
     {TID_STRING, RPC_IN},
     {TID_STRING, RPC_IN | RPC_CXX},
     {TID_STRING, RPC_OUT | RPC_CXX},
     {TID_STRING, RPC_IN | RPC_OUT | RPC_CXX},
     {TID_STRUCT, RPC_IN | RPC_CXX, sizeof(KEY)},
     {TID_STRUCT, RPC_OUT | RPC_CXX, sizeof(KEY)},
     {TID_STRUCT, RPC_IN | RPC_OUT | RPC_CXX, sizeof(KEY)},
     {TID_ARRAY, RPC_IN | RPC_VARARRAY | RPC_CXX},
     {TID_ARRAY, RPC_OUT | RPC_VARARRAY | RPC_CXX},
     {TID_ARRAY, RPC_IN | RPC_OUT | RPC_VARARRAY | RPC_CXX},
     {0}}},
#endif
 
#if 0
   status = rpc_call(RPC_TEST_CXX, ...);
#endif
 
   return status;
}
 
static std::atomic_bool gAllowedHostsEnabled(false);
static std::vector<std::string> gAllowedHosts;
static std::mutex gAllowedHostsMutex;
 
/********************************************************************/
INT rpc_clear_allowed_hosts()
/********************************************************************\
  Routine: rpc_clear_allowed_hosts
 
  Purpose: Clear list of allowed hosts and permit connections from anybody
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   gAllowedHostsMutex.lock();
   gAllowedHosts.clear();
   gAllowedHostsEnabled = false;
   gAllowedHostsMutex.unlock();
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_add_allowed_host(const char *hostname)
/********************************************************************\
  Routine: rpc_add_allowed_host
 
  Purpose: Permit connections from listed hosts only
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NO_MEMORY           Too many allowed hosts
 
\********************************************************************/
{
   //cm_msg(MINFO, "rpc_add_allowed_host", "Adding allowed host \'%s\'", hostname); 
 
   gAllowedHostsMutex.lock();
   gAllowedHosts.push_back(hostname);
   gAllowedHostsEnabled = true;
   gAllowedHostsMutex.unlock();
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_check_allowed_host(const char *hostname)
/********************************************************************\
  Routine: rpc_check_allowed_host
 
  Purpose: Check if hostname is permitted to connect
 
  Function value:
    RPC_SUCCESS             hostname is permitted to connect
    RPC_NOT_REGISTERED      hostname not permitted to connect
 
\********************************************************************/
{
   //printf("rpc_check_allowed_host: enabled %d, hostname [%s]\n", gAllowedHostsEnabled.load(), hostname);
 
   if (!gAllowedHostsEnabled)
      return RPC_SUCCESS;
 
   if (strcmp(hostname, "localhost") == 0)
      return RPC_SUCCESS;
   
   if (strcmp(hostname, "localhost.localdomain") == 0)
      return RPC_SUCCESS;
 
   if (strcmp(hostname, "localhost6") == 0) // RedHat el6, el7
      return RPC_SUCCESS;
 
   if (strcmp(hostname, "ip6-localhost") == 0) // Ubuntu-22
      return RPC_SUCCESS;
 
   int status = RPC_NOT_REGISTERED;
 
   gAllowedHostsMutex.lock();
 
   for (const auto& h: gAllowedHosts) {
      if (h == hostname) {
         status = RPC_SUCCESS;
         break;
      }
   }
 
   gAllowedHostsMutex.unlock();
 
   //if (status != RPC_SUCCESS)
   //   printf("rpc_check_allowed_host: enabled %d, hostname [%s] not found\n", gAllowedHostsEnabled.load(), hostname);
 
   return status;
}
 
/*------------------------------------------------------------------*/
static INT rpc_socket_check_allowed_host(int sock)
{
   std::string hostname;
 
   int status = ss_socket_get_peer_name(sock, &hostname, NULL);
 
   if (status != SS_SUCCESS)
      return status;
   
   status = rpc_check_allowed_host(hostname.c_str());
   
   if (status == RPC_SUCCESS)
      return RPC_SUCCESS;
   
   static std::atomic_int max_report(10);
   if (max_report > 0) {
      max_report--;
      if (max_report == 0) {
         cm_msg(MERROR, "rpc_socket_check_allowed_host", "rejecting connection from unallowed host \'%s\', this message will no longer be reported", hostname.c_str());
      } else {
         cm_msg(MERROR, "rpc_socket_check_allowed_host", "rejecting connection from unallowed host \'%s\'. Add this host to \"/Experiment/Security/RPC hosts/Allowed hosts\"", hostname.c_str());
      }
   }
 
   return RPC_NET_ERROR;
}
 
/********************************************************************/
INT rpc_server_accept(int lsock)
/********************************************************************\
 
  Routine: rpc_server_accept
 
  Purpose: Accept new incoming connections
 
  Input:
    INT    lscok            Listen socket
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_CONNCLOSED          Connection was closed
    RPC_SHUTDOWN            Listener shutdown
    RPC_EXCEED_BUFFER       Not enough memory for network buffer
 
\********************************************************************/
{
   INT i;
   INT sock;
   char version[NAME_LENGTH], v1[32];
   char experiment[NAME_LENGTH];
   INT port1, port2, port3;
   char *ptr;
   char net_buffer[256];
   struct linger ling;
 
   static struct callback_addr callback;
 
   if (lsock > 0) {
      sock = accept(lsock, NULL, NULL);
 
      if (sock == -1)
         return RPC_NET_ERROR;
   } else {
      /* lsock is stdin -> already connected from inetd */
 
      sock = lsock;
   }
 
   /* check access control list */
   if (gAllowedHostsEnabled) {
      int status = rpc_socket_check_allowed_host(sock);
 
      if (status != RPC_SUCCESS) {
         ss_socket_close(&sock);
         return RPC_NET_ERROR;
      }
   }
 
   /* receive string with timeout */
   i = recv_string(sock, net_buffer, 256, 10000);
   rpc_debug_printf("Received command: %s", net_buffer);
 
   if (i > 0) {
      char command = (char) toupper(net_buffer[0]);
 
      //printf("rpc_server_accept: command [%c]\n", command);
 
      switch (command) {
         case 'S': {
 
            /*----------- shutdown listener ----------------------*/
            ss_socket_close(&sock);
            return RPC_SHUTDOWN;
         }
         case 'I': {
 
            /*----------- return available experiments -----------*/
#ifdef LOCAL_ROUTINES
            exptab_struct exptab;
            cm_read_exptab(&exptab); // thread safe!
            for (unsigned i=0; i<exptab.exptab.size(); i++) {
               rpc_debug_printf("Return experiment: %s", exptab.exptab[i].name.c_str());
               const char* str = exptab.exptab[i].name.c_str();
               send(sock, str, strlen(str) + 1, 0);
            }
            send(sock, "", 1, 0);
#endif
            ss_socket_close(&sock);
            break;
         }
         case 'C': {
 
            /*----------- connect to experiment -----------*/
 
            /* get callback information */
            callback.experiment[0] = 0;
            port1 = port2 = version[0] = 0;
 
            //printf("rpc_server_accept: net buffer \'%s\'\n", net_buffer);
 
            /* parse string in format "C port1 port2 port3 version expt" */
            /* example: C 51046 45838 56832 2.0.0 alpha */
 
            port1 = strtoul(net_buffer + 2, &ptr, 0);
            port2 = strtoul(ptr, &ptr, 0);
            port3 = strtoul(ptr, &ptr, 0);
 
            while (*ptr == ' ')
               ptr++;
 
            i = 0;
            for (; *ptr != 0 && *ptr != ' ' && i < (int) sizeof(version) - 1;)
               version[i++] = *ptr++;
 
            // ensure that we do not overwrite buffer "version"
            assert(i < (int) sizeof(version));
            version[i] = 0;
 
            // skip wjatever is left from the "version" string
            for (; *ptr != 0 && *ptr != ' ';)
               ptr++;
 
            while (*ptr == ' ')
               ptr++;
 
            i = 0;
            for (; *ptr != 0 && *ptr != ' ' && *ptr != '\n' && *ptr != '\r' && i < (int) sizeof(experiment) - 1;)
               experiment[i++] = *ptr++;
 
            // ensure that we do not overwrite buffer "experiment"
            assert(i < (int) sizeof(experiment));
            experiment[i] = 0;
 
            callback.experiment = experiment;
 
            /* print warning if version patch level doesn't agree */
            mstrlcpy(v1, version, sizeof(v1));
            if (strchr(v1, '.'))
               if (strchr(strchr(v1, '.') + 1, '.'))
                  *strchr(strchr(v1, '.') + 1, '.') = 0;
 
            char str[100];
            mstrlcpy(str, cm_get_version(), sizeof(str));
            if (strchr(str, '.'))
               if (strchr(strchr(str, '.') + 1, '.'))
                  *strchr(strchr(str, '.') + 1, '.') = 0;
 
            if (strcmp(v1, str) != 0) {
               cm_msg(MERROR, "rpc_server_accept", "client MIDAS version %s differs from local version %s", version, cm_get_version());
               cm_msg(MERROR, "rpc_server_accept", "received string: %s", net_buffer + 2);
            }
 
            callback.host_port1 = (short) port1;
            callback.host_port2 = (short) port2;
            callback.host_port3 = (short) port3;
            callback.debug = _debug_mode;
 
            int status = ss_socket_get_peer_name(sock, &callback.host_name, NULL);
 
            if (status != SS_SUCCESS) {
               ss_socket_close(&sock);
               break;
            }
 
#ifdef LOCAL_ROUTINES
            /* update experiment definition */
            exptab_struct exptab;
            cm_read_exptab(&exptab); // thread safe!
 
            unsigned idx = 0;
            bool found = false;
            /* lookup experiment */
            if (equal_ustring(callback.experiment.c_str(), "Default")) {
               found = true;
               idx = 0;
            } else {
               for (idx = 0; idx < exptab.exptab.size(); idx++) {
                  if (exptab.exptab[idx].name == callback.experiment) {
                     if (ss_dir_exist(exptab.exptab[idx].directory.c_str())) {
                        found = true;
                        break;
                     }
                  }
               }
            }
 
            if (!found) {
               cm_msg(MERROR, "rpc_server_accept", "experiment \'%s\' not defined in exptab file \'%s\'", callback.experiment.c_str(), exptab.filename.c_str());
 
               send(sock, "2", 2, 0);   /* 2 means exp. not found */
               ss_socket_close(&sock);
               break;
            }
 
            callback.directory = exptab.exptab[idx].directory;
            callback.user = exptab.exptab[idx].user;
 
            /* create a new process */
            char host_port1_str[30], host_port2_str[30], host_port3_str[30];
            char debug_str[30];
 
            sprintf(host_port1_str, "%d", callback.host_port1);
            sprintf(host_port2_str, "%d", callback.host_port2);
            sprintf(host_port3_str, "%d", callback.host_port3);
            sprintf(debug_str, "%d", callback.debug);
 
            const char *mserver_path = rpc_get_mserver_path();
 
            const char *argv[10];
            argv[0] = mserver_path;
            argv[1] = callback.host_name.c_str();
            argv[2] = host_port1_str;
            argv[3] = host_port2_str;
            argv[4] = host_port3_str;
            argv[5] = debug_str;
            argv[6] = callback.experiment.c_str();
            argv[7] = callback.directory.c_str();
            argv[8] = callback.user.c_str();
            argv[9] = NULL;
 
            rpc_debug_printf("Spawn: %s %s %s %s %s %s %s %s %s %s",
                             argv[0], argv[1], argv[2], argv[3], argv[4], argv[5], argv[6], argv[7], argv[8],
                             argv[9]);
 
            status = ss_spawnv(P_NOWAIT, mserver_path, argv);
 
            if (status != SS_SUCCESS) {
               rpc_debug_printf("Cannot spawn subprocess: %s\n", strerror(errno));
 
               sprintf(str, "3");       /* 3 means cannot spawn subprocess */
               send(sock, str, strlen(str) + 1, 0);
               ss_socket_close(&sock);
               break;
            }
 
            sprintf(str, "1 %s", cm_get_version());     /* 1 means ok */
            send(sock, str, strlen(str) + 1, 0);
#endif // LOCAL_ROUTINES
            ss_socket_close(&sock);
 
            break;
         }
         default: {
            cm_msg(MERROR, "rpc_server_accept", "received unknown command '%c' code %d", command, command);
            ss_socket_close(&sock);
            break;
         }
      }
   } else {                     /* if i>0 */
 
      /* lingering needed for PCTCP */
      ling.l_onoff = 1;
      ling.l_linger = 0;
      setsockopt(sock, SOL_SOCKET, SO_LINGER, (char *) &ling, sizeof(ling));
      ss_socket_close(&sock);
   }
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_client_accept(int lsock)
/********************************************************************\
 
  Routine: rpc_client_accept
 
  Purpose: midas program accept new RPC connection (run transitions, etc)
 
  Input:
    INT    lsock            Listen socket
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_NET_ERROR           Error in socket call
    RPC_CONNCLOSED          Connection was closed
    RPC_SHUTDOWN            Listener shutdown
    RPC_EXCEED_BUFFER       Not enough memory for network buffer
 
\********************************************************************/
{
   INT i, status;
   INT client_hw_type = 0, hw_type;
   std::string client_program;
   std::string host_name;
   INT convert_flags;
   char net_buffer[256], *p;
 
   int sock = accept(lsock, NULL, NULL);
 
   if (sock == -1)
      return RPC_NET_ERROR;
 
   /* check access control list */
   if (gAllowedHostsEnabled) {
      int status = rpc_socket_check_allowed_host(sock);
 
      if (status != RPC_SUCCESS) {
         ss_socket_close(&sock);
         return RPC_NET_ERROR;
      }
   }
 
   host_name = "(unknown)";
   client_program = "(unknown)";
 
   /* receive string with timeout */
   i = recv_string(sock, net_buffer, sizeof(net_buffer), 10000);
   if (i <= 0) {
      ss_socket_close(&sock);
      return RPC_NET_ERROR;
   }
 
   /* get remote computer info */
   p = strtok(net_buffer, " ");
   if (p != NULL) {
      client_hw_type = atoi(p);
      p = strtok(NULL, " ");
   }
   if (p != NULL) {
      //version = atoi(p);
      p = strtok(NULL, " ");
   }
   if (p != NULL) {
      client_program = p;
      p = strtok(NULL, " ");
   }
   if (p != NULL) {
      host_name = p;
      p = strtok(NULL, " ");
   }
 
   //printf("rpc_client_accept: client_hw_type %d, version %d, client_name \'%s\', hostname \'%s\'\n", client_hw_type, version, client_program, host_name);
 
   RPC_SERVER_ACCEPTION* sa = rpc_new_server_acception();
 
   /* save information in _server_acception structure */
   sa->recv_sock = sock;
   sa->send_sock = 0;
   sa->event_sock = 0;
   sa->remote_hw_type = client_hw_type;
   sa->host_name = host_name;
   sa->prog_name = client_program;
   sa->last_activity = ss_millitime();
   sa->watchdog_timeout = 0;
   sa->is_mserver = FALSE;
 
   /* send my own computer id */
   hw_type = rpc_get_hw_type();
   std::string str = msprintf("%d %s", hw_type, cm_get_version());
   status = send(sock, str.c_str(), str.length() + 1, 0);
   if (status != (INT) str.length() + 1)
      return RPC_NET_ERROR;
 
   rpc_calc_convert_flags(hw_type, client_hw_type, &convert_flags);
   sa->convert_flags = convert_flags;
 
   ss_suspend_set_server_acceptions(&_server_acceptions);
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_server_callback(struct callback_addr *pcallback)
/********************************************************************\
 
  Routine: rpc_server_callback
 
  Purpose: Callback a remote client. Setup _server_acception entry
           with optional conversion flags and establish two-way
           TCP connection.
 
  Input:
    callback_addr pcallback Pointer to a callback structure
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   INT status;
   int recv_sock, send_sock, event_sock;
   char str[100];
   std::string client_program;
   INT client_hw_type, hw_type;
   INT convert_flags;
   char net_buffer[256];
   char *p;
   int flag;
 
   /* copy callback information */
   struct callback_addr callback = *pcallback;
   //idx = callback.index;
 
   std::string errmsg;
 
   /* create new sockets for TCP */
   status = ss_socket_connect_tcp(callback.host_name.c_str(), callback.host_port1, &recv_sock, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_callback", "cannot connect receive socket, host \"%s\", port %d: %s", callback.host_name.c_str(), callback.host_port1, errmsg.c_str());
      ss_socket_close(&recv_sock);
      //ss_socket_close(&send_sock);
      //ss_socket_close(&event_sock);
      return RPC_NET_ERROR;
   }
 
   status = ss_socket_connect_tcp(callback.host_name.c_str(), callback.host_port2, &send_sock, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_callback", "cannot connect send socket, host \"%s\", port %d: %s", callback.host_name.c_str(), callback.host_port2, errmsg.c_str());
      ss_socket_close(&recv_sock);
      ss_socket_close(&send_sock);
      //ss_socket_close(&event_sock);
      return RPC_NET_ERROR;
   }
 
   status = ss_socket_connect_tcp(callback.host_name.c_str(), callback.host_port3, &event_sock, &errmsg);
 
   if (status != SS_SUCCESS) {
      cm_msg(MERROR, "rpc_server_callback", "cannot connect event socket, host \"%s\", port %d: %s", callback.host_name.c_str(), callback.host_port2, errmsg.c_str());
      ss_socket_close(&recv_sock);
      ss_socket_close(&send_sock);
      ss_socket_close(&event_sock);
      return RPC_NET_ERROR;
   }
#ifndef OS_ULTRIX               /* crashes ULTRIX... */
   /* increase send buffer size to 2 Mbytes, on Linux also limited by sysctl net.ipv4.tcp_rmem and net.ipv4.tcp_wmem */
   flag = 2 * 1024 * 1024;
   status = setsockopt(event_sock, SOL_SOCKET, SO_RCVBUF, (char *) &flag, sizeof(INT));
   if (status != 0)
      cm_msg(MERROR, "rpc_server_callback", "cannot setsockopt(SOL_SOCKET, SO_RCVBUF), errno %d (%s)", errno,
             strerror(errno));
#endif
 
   if (recv_string(recv_sock, net_buffer, 256, _rpc_connect_timeout) <= 0) {
      cm_msg(MERROR, "rpc_server_callback", "timeout on receive remote computer info");
      ss_socket_close(&recv_sock);
      ss_socket_close(&send_sock);
      ss_socket_close(&event_sock);
      return RPC_NET_ERROR;
   }
   //printf("rpc_server_callback: \'%s\'\n", net_buffer);
 
   /* get remote computer info */
   client_hw_type = strtoul(net_buffer, &p, 0);
 
   while (*p == ' ')
      p++;
 
   client_program = p;
 
   //printf("hw type %d, name \'%s\'\n", client_hw_type, client_program);
 
   std::string host_name;
 
   status = ss_socket_get_peer_name(recv_sock, &host_name, NULL);
 
   if (status != SS_SUCCESS)
      host_name = "unknown";
 
   //printf("rpc_server_callback: mserver acception\n");
 
   RPC_SERVER_ACCEPTION* sa = rpc_new_server_acception();
 
   /* save information in _server_acception structure */
   sa->recv_sock = recv_sock;
   sa->send_sock = send_sock;
   sa->event_sock = event_sock;
   sa->remote_hw_type = client_hw_type;
   sa->host_name = host_name;
   sa->prog_name = client_program;
   sa->last_activity = ss_millitime();
   sa->watchdog_timeout = 0;
   sa->is_mserver = TRUE;
 
   assert(_mserver_acception == NULL);
 
   _mserver_acception = sa;
 
   //printf("rpc_server_callback: _mserver_acception %p\n", _mserver_acception);
 
   /* send my own computer id */
   hw_type = rpc_get_hw_type();
   sprintf(str, "%d", hw_type);
   send(recv_sock, str, strlen(str) + 1, 0);
 
   rpc_calc_convert_flags(hw_type, client_hw_type, &convert_flags);
   sa->convert_flags = convert_flags;
 
   ss_suspend_set_server_acceptions(&_server_acceptions);
 
   if (rpc_is_mserver()) {
      rpc_debug_printf("Connection to %s:%s established\n", sa->host_name.c_str(), sa->prog_name.c_str());
   }
 
   return RPC_SUCCESS;
}
 
 
/********************************************************************/
INT rpc_server_loop(void)
/********************************************************************\
 
  Routine: rpc_server_loop
 
  Purpose: mserver main event loop
 
\********************************************************************/
{
   while (1) {
      int status = ss_suspend(1000, 0);
 
      if (status == SS_ABORT || status == SS_EXIT)
         break;
 
      if (rpc_check_channels() == RPC_NET_ERROR)
         break;
 
      /* check alarms, etc */
      status = cm_periodic_tasks();
 
      cm_msg_flush_buffer();
   }
 
   return RPC_SUCCESS;
}
 
/********************************************************************/
INT rpc_server_receive_rpc(int idx, RPC_SERVER_ACCEPTION* sa)
/********************************************************************\
 
  Routine: rpc_server_receive_rpc
 
  Purpose: Receive rpc commands and execute them. Close the connection
           if client has broken TCP pipe.
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_EXCEED_BUFFER       Not enough memeory to allocate buffer
    SS_EXIT                 Server connection was closed
    SS_ABORT                Server connection was broken
 
\********************************************************************/
{
   int status = 0;
   int remaining = 0;
 
   char *buf = NULL;
   int bufsize = 0;
   
   do {
      int n_received = recv_net_command_realloc(idx, &buf, &bufsize, &remaining);
      
      if (n_received <= 0) {
         status = SS_ABORT;
         cm_msg(MERROR, "rpc_server_receive_rpc", "recv_net_command() returned %d, abort", n_received);
         goto error;
      }
      
      status = rpc_execute(sa->recv_sock, buf, sa->convert_flags);
      
      if (status == SS_ABORT) {
         cm_msg(MERROR, "rpc_server_receive_rpc", "rpc_execute() returned %d, abort", status);
         goto error;
      }
      
         if (status == SS_EXIT || status == RPC_SHUTDOWN) {
            if (rpc_is_mserver())
               rpc_debug_printf("Connection to %s:%s closed\n", sa->host_name.c_str(), sa->prog_name.c_str());
            goto exit;
         }
         
   } while (remaining);
   
   if (buf) {
      free(buf);
      buf = NULL;
      bufsize = 0;
   }
 
   return RPC_SUCCESS;
 
   error:
 
   {
      char str[80];
      mstrlcpy(str, sa->host_name.c_str(), sizeof(str));
      if (strchr(str, '.'))
         *strchr(str, '.') = 0;
      cm_msg(MTALK, "rpc_server_receive_rpc", "Program \'%s\' on host \'%s\' aborted", sa->prog_name.c_str(), str);
   }
 
   exit:
 
   cm_msg_flush_buffer();
 
   if (buf) {
      free(buf);
      buf = NULL;
      bufsize = 0;
   }
 
   /* disconnect from experiment as MIDAS server */
   if (rpc_is_mserver()) {
      HNDLE hDB, hKey;
 
      cm_get_experiment_database(&hDB, &hKey);
 
      /* only disconnect from experiment if previously connected.
         Necessary for pure RPC servers (RPC_SRVR) */
      if (hDB) {
         bm_close_all_buffers();
         cm_delete_client_info(hDB, 0);
         db_close_all_databases();
 
         rpc_deregister_functions();
 
         cm_set_experiment_database(0, 0);
      }
   }
 
   bool is_mserver = sa->is_mserver;
 
   sa->close();
 
   /* signal caller a shutdonw */
   if (status == RPC_SHUTDOWN)
      return status;
 
   /* only the mserver should stop on server connection closure */
   if (!is_mserver) {
      return SS_SUCCESS;
   }
 
   return status;
}
 
/********************************************************************/
INT rpc_server_receive_event(int idx, RPC_SERVER_ACCEPTION* sa, int timeout_msec)
/********************************************************************\
 
  Routine: rpc_server_receive_event
 
  Purpose: Receive event and dispatch it
 
  Function value:
    RPC_SUCCESS             Successful completion
    RPC_EXCEED_BUFFER       Not enough memeory to allocate buffer
    SS_EXIT                 Server connection was closed
    SS_ABORT                Server connection was broken
 
\********************************************************************/
{
   int status = 0;
 
   DWORD start_time = ss_millitime();
 
   //
   // THIS IS NOT THREAD SAFE!!!
   //
   // IT IS ONLY USED BY THE MSERVER
   // MSERVER IS SINGLE-THREADED!!!
   //
 
   static char *xbuf = NULL;
   static int   xbufsize = 0;
   static bool  xbufempty = true;
 
   // short cut
   if (sa == NULL && xbufempty)
      return RPC_SUCCESS;
 
   static bool  recurse = false;
 
   if (recurse) {
      cm_msg(MERROR, "rpc_server_receive_event", "internal error: called recursively");
      // do not do anything if we are called recursively
      // via recursive ss_suspend() or otherwise. K.O.
      if (xbufempty)
         return RPC_SUCCESS;
      else
         return BM_ASYNC_RETURN;
   }
 
   recurse = true;
   
   do {
      if (xbufempty && sa) {
         int n_received = recv_event_server_realloc(idx, sa, &xbuf, &xbufsize);
      
         if (n_received < 0) {
            status = SS_ABORT;
            cm_msg(MERROR, "rpc_server_receive_event", "recv_event_server_realloc() returned %d, abort", n_received);
            goto error;
         }
 
         if (n_received == 0) {
            // no more data in the tcp socket
            recurse = false;
            return RPC_SUCCESS;
         }
 
         xbufempty = false;
      }
 
      if (xbufempty) {
         // no event in xbuf buffer
         recurse = false;
         return RPC_SUCCESS;
      }
 
      /* send event to buffer */
      INT *pbh = (INT *) xbuf;
      EVENT_HEADER *pevent = (EVENT_HEADER *) (pbh + 1);
      
      status = bm_send_event(*pbh, pevent, 0, timeout_msec);
 
      //printf("rpc_server_receiv: buffer_handle %d, event_id 0x%04x, serial 0x%08x, data_size %d, status %d\n", *pbh, pevent->event_id, pevent->serial_number, pevent->data_size, status);
      
      if (status == SS_ABORT) {
         cm_msg(MERROR, "rpc_server_receive_event", "bm_send_event() error %d (SS_ABORT), abort", status);
         goto error;
      }
      
      if (status == BM_ASYNC_RETURN) {
         //cm_msg(MERROR, "rpc_server_receive_event", "bm_send_event() error %d, event buffer is full", status);
         recurse = false;
         return status;
      }
      
      if (status != BM_SUCCESS) {
         cm_msg(MERROR, "rpc_server_receive_event", "bm_send_event() error %d, mserver dropped this event", status);
      }
      
      xbufempty = true;
 
      /* repeat for maximum 0.5 sec */
   } while (ss_millitime() - start_time < 500);
   
   recurse = false;
   return RPC_SUCCESS;
 
   error:
 
   {
      char str[80];
      mstrlcpy(str, sa->host_name.c_str(), sizeof(str));
      if (strchr(str, '.'))
         *strchr(str, '.') = 0;
      cm_msg(MTALK, "rpc_server_receive_event", "Program \'%s\' on host \'%s\' aborted", sa->prog_name.c_str(), str);
   }
 
   //exit:
 
   cm_msg_flush_buffer();
 
   /* disconnect from experiment as MIDAS server */
   if (rpc_is_mserver()) {
      HNDLE hDB, hKey;
 
      cm_get_experiment_database(&hDB, &hKey);
 
      /* only disconnect from experiment if previously connected.
         Necessary for pure RPC servers (RPC_SRVR) */
      if (hDB) {
         bm_close_all_buffers();
         cm_delete_client_info(hDB, 0);
         db_close_all_databases();
 
         rpc_deregister_functions();
 
         cm_set_experiment_database(0, 0);
      }
   }
 
   bool is_mserver = sa->is_mserver;
 
   sa->close();
 
   /* signal caller a shutdonw */
   if (status == RPC_SHUTDOWN)
      return status;
 
   /* only the mserver should stop on server connection closure */
   if (!is_mserver) {
      return SS_SUCCESS;
   }
 
   return status;
}
 
 
/********************************************************************/
int rpc_flush_event_socket(int timeout_msec)
/********************************************************************\
 
  Routine: rpc_flush_event_socket
 
  Purpose: Receive and en-buffer events from the mserver event socket
 
  Function value:
    BM_SUCCESS              Event socket is empty, all data was read an en-buffered
    BM_ASYNC_RETURN         Event socket has unread data or event buffer is full and rpc_server_receive_event() has an un-buffered event.
    SS_EXIT                 Server connection was closed
    SS_ABORT                Server connection was broken
 
\********************************************************************/
{
   bool has_data = ss_event_socket_has_data();
   
   //printf("ss_event_socket_has_data() returned %d\n", has_data);
 
   if (has_data) {
      if (timeout_msec == BM_NO_WAIT) {
         return BM_ASYNC_RETURN;
      } else if (timeout_msec == BM_WAIT) {
         return BM_ASYNC_RETURN;
      } else {
         int status = ss_suspend(timeout_msec, MSG_BM);
         if (status == SS_ABORT || status == SS_EXIT)
            return status;
         return BM_ASYNC_RETURN;
      }
   }
 
   int status = rpc_server_receive_event(0, NULL, timeout_msec);
   
   //printf("rpc_server_receive_event() status %d\n", status);
 
   if (status == BM_ASYNC_RETURN) {
      return BM_ASYNC_RETURN;
   }
 
   if (status == SS_ABORT || status == SS_EXIT)
      return status;
   
   return BM_SUCCESS;
}
 
/********************************************************************/
INT rpc_server_shutdown(void)
/********************************************************************\
 
  Routine: rpc_server_shutdown
 
  Purpose: Shutdown RPC server, abort all connections
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Successful completion
 
\********************************************************************/
{
   //printf("rpc_server_shutdown!\n");
 
   struct linger ling;
 
   /* close all open connections */
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++) {
      if (_server_acceptions[idx] && _server_acceptions[idx]->recv_sock != 0) {
         RPC_SERVER_ACCEPTION* sa = _server_acceptions[idx];
         /* lingering needed for PCTCP */
         ling.l_onoff = 1;
         ling.l_linger = 0;
         setsockopt(sa->recv_sock, SOL_SOCKET, SO_LINGER, (char *) &ling, sizeof(ling));
         ss_socket_close(&sa->recv_sock);
 
         if (sa->send_sock) {
            setsockopt(sa->send_sock, SOL_SOCKET, SO_LINGER, (char *) &ling, sizeof(ling));
            ss_socket_close(&sa->send_sock);
         }
 
         if (sa->event_sock) {
            setsockopt(sa->event_sock, SOL_SOCKET, SO_LINGER, (char *) &ling, sizeof(ling));
            ss_socket_close(&sa->event_sock);
         }
      }
   }
 
   /* avoid memory leak */
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++) {
      RPC_SERVER_ACCEPTION* sa = _server_acceptions[idx];
      if (sa) {
         //printf("rpc_server_shutdown: %d %p %p\n", idx, sa, _mserver_acception);
         if (sa == _mserver_acception) {
            // do not leave behind a stale pointer!
            _mserver_acception = NULL;
         }
         delete sa;
         _server_acceptions[idx] = NULL;
      }
   }
 
   if (_rpc_registered) {
      ss_socket_close(&_rpc_listen_socket);
      _rpc_registered = FALSE;
   }
 
   /* free suspend structures */
   ss_suspend_exit();
 
   return RPC_SUCCESS;
}
 
 
/********************************************************************/
INT rpc_check_channels(void)
/********************************************************************\
 
  Routine: rpc_check_channels
 
  Purpose: Check open rpc channels by sending watchdog messages
 
  Input:
    none
 
  Output:
    none
 
  Function value:
    RPC_SUCCESS             Channel is still alive
    RPC_NET_ERROR           Connection is broken
 
\********************************************************************/
{
   INT status;
   NET_COMMAND nc;
   fd_set readfds;
   struct timeval timeout;
 
   //printf("rpc_check_channels!\n");
 
   for (unsigned idx = 0; idx < _server_acceptions.size(); idx++) {
      if (_server_acceptions[idx] && _server_acceptions[idx]->recv_sock) {
         RPC_SERVER_ACCEPTION* sa = _server_acceptions[idx];
         if (sa == NULL)
            continue;
         
         if (sa->watchdog_timeout == 0) {
            continue;
         }
 
         DWORD elapsed = ss_millitime() - sa->last_activity;
 
         //printf("rpc_check_channels: idx %d, watchdog_timeout %d, last_activity %d, elapsed %d\n", idx, sa->watchdog_timeout, sa->last_activity, elapsed);
 
         if (sa->watchdog_timeout && (elapsed > (DWORD)sa->watchdog_timeout)) {
         
            //printf("rpc_check_channels: send watchdog message to %s on %s\n", sa->prog_name.c_str(), sa->host_name.c_str());
 
            /* send a watchdog message */
            nc.header.routine_id = MSG_WATCHDOG;
            nc.header.param_size = 0;
 
            int convert_flags = sa->convert_flags;
            if (convert_flags) {
               rpc_convert_single(&nc.header.routine_id, TID_UINT32, RPC_OUTGOING, convert_flags);
               rpc_convert_single(&nc.header.param_size, TID_UINT32, RPC_OUTGOING, convert_flags);
            }
 
            /* send the header to the client */
            int i = send_tcp(sa->send_sock, (char *) &nc, sizeof(NET_COMMAND_HEADER), 0);
 
            if (i < 0) {
               cm_msg(MINFO, "rpc_check_channels", "client \"%s\" on host \"%s\" failed watchdog test after %d sec, send_tcp() returned %d",
                      sa->prog_name.c_str(),
                      sa->host_name.c_str(),
                      sa->watchdog_timeout / 1000,
                      i);
               
               /* disconnect from experiment */
               if (rpc_is_mserver()) {
                  cm_disconnect_experiment();
                  return RPC_NET_ERROR;
               }
               
               sa->close();
               return RPC_NET_ERROR;
            }
 
            DWORD timeout_end_ms = ss_millitime() + sa->watchdog_timeout;
 
            while (1) {
               FD_ZERO(&readfds);
               FD_SET(sa->send_sock, &readfds);
               FD_SET(sa->recv_sock, &readfds);
               
               timeout.tv_sec  = 1;
               timeout.tv_usec = 0;
 
               status = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
 
               DWORD now = ss_millitime();
 
               //printf("waiting for reply: %d %d, diff %d, select() status %d\n", now, timeout_end_ms, timeout_end_ms - now, status);
 
               if (now > timeout_end_ms) // timeout
                  break;
 
               if (status > 0) // select has something to read
                  break;
 
               // select() returned 0, timeout
               // select() returned -1, error, likely EAGAIN or EINTR
 
               cm_periodic_tasks();
               cm_msg_flush_buffer();
            }
 
            if (!FD_ISSET(sa->send_sock, &readfds) &&
                !FD_ISSET(sa->recv_sock, &readfds)) {
 
               cm_msg(MERROR, "rpc_check_channels", "client \"%s\" on host \"%s\" failed watchdog test after %d sec",
                      sa->prog_name.c_str(),
                      sa->host_name.c_str(),
                      sa->watchdog_timeout / 1000);
               
               /* disconnect from experiment */
               if (rpc_is_mserver()) {
                  cm_disconnect_experiment();
                  return RPC_NET_ERROR;
               }               
 
               sa->close();
               return RPC_NET_ERROR;
            }
 
            /* receive result on send socket */
            if (FD_ISSET(sa->send_sock, &readfds)) {
               i = recv_tcp(sa->send_sock, (char *) &nc, sizeof(nc), 0);
               if (i <= 0) {
                  cm_msg(MERROR, "rpc_check_channels", "client \"%s\" on host \"%s\" failed watchdog test after %d sec, recv_tcp() returned %d",
                         sa->prog_name.c_str(),
                         sa->host_name.c_str(),
                         sa->watchdog_timeout / 1000,
                         i);
                  
                  /* disconnect from experiment */
                  if (rpc_is_mserver()) {
                     cm_disconnect_experiment();
                     return RPC_NET_ERROR;
                  }
                  
                  sa->close();
                  return RPC_NET_ERROR;
               }
            }
         }
      }
   }
 
   return RPC_SUCCESS;
}
 
/********************************************************************\
*                                                                    *
*                 Bank functions                                     *
*                                                                    *
\********************************************************************/
 
/********************************************************************/
void bk_init(void *event) {
   ((BANK_HEADER *) event)->data_size = 0;
   ((BANK_HEADER *) event)->flags = BANK_FORMAT_VERSION;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
BOOL bk_is32(const void *event)
/********************************************************************\
 
  Routine: bk_is32
 
  Purpose: Return true if banks inside event are 32-bit banks
 
  Input:
    void   *event           pointer to the event
 
  Output:
    none
 
  Function value:
    none
 
\********************************************************************/
{
   return ((((BANK_HEADER *) event)->flags & BANK_FORMAT_32BIT) > 0);
}
 
/********************************************************************/
BOOL bk_is32a(const void *event)
/********************************************************************\
 
  Routine: bk_is32a
 
  Purpose: Return true if banks inside event are 32-bit banks
           and banks are 64-bit aligned
 
  Input:
    void   *event           pointer to the event
 
  Output:
    none
 
  Function value:
    none
 
\********************************************************************/
{
   return ((((BANK_HEADER *) event)->flags & BANK_FORMAT_64BIT_ALIGNED) > 0);
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
void bk_init32(void *event) {
   ((BANK_HEADER *) event)->data_size = 0;
   ((BANK_HEADER *) event)->flags = BANK_FORMAT_VERSION | BANK_FORMAT_32BIT;
}
 
/********************************************************************/
void bk_init32a(void *event) {
   ((BANK_HEADER *) event)->data_size = 0;
   ((BANK_HEADER *) event)->flags = BANK_FORMAT_VERSION | BANK_FORMAT_32BIT | BANK_FORMAT_64BIT_ALIGNED;
}
 
/********************************************************************/
INT bk_size(const void *event) {
   return ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER);
}
 
static void copy_bk_name(char* dst, const char* src)
{
   // copy 4 byte bank name from "src" to "dst", set unused bytes of "dst" to NUL.
 
   if (src[0] == 0) {
      // invalid empty name
      dst[0] = 0;
      dst[1] = 0;
      dst[2] = 0;
      dst[3] = 0;
      return;
   }
 
   dst[0] = src[0];
 
   if (src[1] == 0) {
      dst[1] = 0;
      dst[2] = 0;
      dst[3] = 0;
      return;
   }
 
   dst[1] = src[1];
 
   if (src[2] == 0) {
      dst[2] = 0;
      dst[3] = 0;
      return;
   }
 
   dst[2] = src[2];
 
   if (src[3] == 0) {
      dst[3] = 0;
      return;
   }
 
   dst[3] = src[3];
}
 
/********************************************************************/
void bk_create(void *event, const char *name, WORD type, void **pdata) {
   if (bk_is32a((BANK_HEADER *) event)) {
      if (((PTYPE) event & 0x07) != 0) {
         cm_msg(MERROR, "bk_create", "Bank %s created with unaligned event pointer", name);
         return;
      }
      BANK32A *pbk32a;
 
      pbk32a = (BANK32A *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      copy_bk_name(pbk32a->name, name);
      pbk32a->type = type;
      pbk32a->data_size = 0;
      *pdata = pbk32a + 1;
   } else if (bk_is32((BANK_HEADER *) event)) {
      BANK32 *pbk32;
 
      pbk32 = (BANK32 *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      copy_bk_name(pbk32->name, name);
      pbk32->type = type;
      pbk32->data_size = 0;
      *pdata = pbk32 + 1;
   } else {
      BANK *pbk;
 
      pbk = (BANK *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      copy_bk_name(pbk->name, name);
      pbk->type = type;
      pbk->data_size = 0;
      *pdata = pbk + 1;
   }
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT bk_copy(char *pevent, char *psrce, const char *bkname) {
 
   INT status;
   DWORD bklen, bktype, bksze;
   BANK_HEADER *psBkh;
   BANK *psbkh;
   char *pdest;
   void *psdata;
 
   // source pointing on the BANKxx
   psBkh = (BANK_HEADER *) ((EVENT_HEADER *) psrce + 1);
   // Find requested bank
   status = bk_find(psBkh, bkname, &bklen, &bktype, &psdata);
   // Return 0 if not found
   if (status != SUCCESS) return 0;
 
   // Check bank type...
   // You cannot mix BANK and BANK32 so make sure all the FE use either
   // bk_init(pevent) or bk_init32(pevent).
   if (bk_is32a(psBkh)) {
 
      // pointer to the source bank header
      BANK32A *psbkh32a = ((BANK32A *) psdata - 1);
      // Data size in the bank
      bksze = psbkh32a->data_size;
 
      // Get to the end of the event
      pdest = (char *) (((BANK_HEADER *) pevent) + 1) + ((BANK_HEADER *) pevent)->data_size;
      // Copy from BANK32 to end of Data
      memmove(pdest, (char *) psbkh32a, ALIGN8(bksze) + sizeof(BANK32A));
      // Bring pointer to the next free location
      pdest += ALIGN8(bksze) + sizeof(BANK32A);
 
   } else if (bk_is32(psBkh)) {
 
      // pointer to the source bank header
      BANK32 *psbkh32 = ((BANK32 *) psdata - 1);
      // Data size in the bank
      bksze = psbkh32->data_size;
 
      // Get to the end of the event
      pdest = (char *) (((BANK_HEADER *) pevent) + 1) + ((BANK_HEADER *) pevent)->data_size;
      // Copy from BANK32 to end of Data
      memmove(pdest, (char *) psbkh32, ALIGN8(bksze) + sizeof(BANK32));
      // Bring pointer to the next free location
      pdest += ALIGN8(bksze) + sizeof(BANK32);
 
   } else {
 
      // pointer to the source bank header
      psbkh = ((BANK *) psdata - 1);
      // Data size in the bank
      bksze = psbkh->data_size;
 
      // Get to the end of the event
      pdest = (char *) (((BANK_HEADER *) pevent) + 1) + ((BANK_HEADER *) pevent)->data_size;
      // Copy from BANK to end of Data
      memmove(pdest, (char *) psbkh, ALIGN8(bksze) + sizeof(BANK));
      // Bring pointer to the next free location
      pdest += ALIGN8(bksze) + sizeof(BANK);
   }
 
   // Close bank (adjust BANK_HEADER size)
   bk_close(pevent, pdest);
   // Adjust EVENT_HEADER size
   ((EVENT_HEADER *) pevent - 1)->data_size = ((BANK_HEADER *) pevent)->data_size + sizeof(BANK_HEADER);
   return SUCCESS;
}
 
/********************************************************************/
int bk_delete(void *event, const char *name)
/********************************************************************\
 
  Routine: bk_delete
 
  Purpose: Delete a MIDAS bank inside an event
 
  Input:
    void   *event           pointer to the event
    char   *name            Name of bank (exactly four letters)
 
  Function value:
    CM_SUCCESS              Bank has been deleted
    0                       Bank has not been found
 
\********************************************************************/
{
   BANK *pbk;
   DWORD dname;
   int remaining;
 
   if (bk_is32a((BANK_HEADER *) event)) {
      /* locate bank */
      BANK32A *pbk32a = (BANK32A *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk32a->name) == dname) {
            /* bank found, delete it */
            remaining = ((char *) event + ((BANK_HEADER *) event)->data_size +
                         sizeof(BANK_HEADER)) - ((char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size));
 
            /* reduce total event size */
            ((BANK_HEADER *) event)->data_size -= sizeof(BANK32) + ALIGN8(pbk32a->data_size);
 
            /* copy remaining bytes */
            if (remaining > 0)
               memmove(pbk32a, (char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size), remaining);
            return CM_SUCCESS;
         }
 
         pbk32a = (BANK32A *) ((char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size));
      } while ((DWORD) ((char *) pbk32a - (char *) event) <
               ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER));
   } else if (bk_is32((BANK_HEADER *) event)) {
      /* locate bank */
      BANK32 *pbk32 = (BANK32 *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk32->name) == dname) {
            /* bank found, delete it */
            remaining = ((char *) event + ((BANK_HEADER *) event)->data_size +
                         sizeof(BANK_HEADER)) - ((char *) (pbk32 + 1) + ALIGN8(pbk32->data_size));
 
            /* reduce total event size */
            ((BANK_HEADER *) event)->data_size -= sizeof(BANK32) + ALIGN8(pbk32->data_size);
 
            /* copy remaining bytes */
            if (remaining > 0)
               memmove(pbk32, (char *) (pbk32 + 1) + ALIGN8(pbk32->data_size), remaining);
            return CM_SUCCESS;
         }
 
         pbk32 = (BANK32 *) ((char *) (pbk32 + 1) + ALIGN8(pbk32->data_size));
      } while ((DWORD) ((char *) pbk32 - (char *) event) <
               ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER));
   } else {
      /* locate bank */
      pbk = (BANK *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk->name) == dname) {
            /* bank found, delete it */
            remaining = ((char *) event + ((BANK_HEADER *) event)->data_size +
                         sizeof(BANK_HEADER)) - ((char *) (pbk + 1) + ALIGN8(pbk->data_size));
 
            /* reduce total event size */
            ((BANK_HEADER *) event)->data_size -= sizeof(BANK) + ALIGN8(pbk->data_size);
 
            /* copy remaining bytes */
            if (remaining > 0)
               memmove(pbk, (char *) (pbk + 1) + ALIGN8(pbk->data_size), remaining);
            return CM_SUCCESS;
         }
 
         pbk = (BANK *) ((char *) (pbk + 1) + ALIGN8(pbk->data_size));
      } while ((DWORD) ((char *) pbk - (char *) event) <
               ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER));
   }
 
   return 0;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT bk_close(void *event, void *pdata) {
   if (bk_is32a((BANK_HEADER *) event)) {
      BANK32A *pbk32a = (BANK32A *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      pbk32a->data_size = (DWORD) ((char *) pdata - (char *) (pbk32a + 1));
      if (pbk32a->type == TID_STRUCT && pbk32a->data_size == 0)
         printf("Warning: TID_STRUCT bank %c%c%c%c has zero size\n", pbk32a->name[0], pbk32a->name[1], pbk32a->name[2], pbk32a->name[3]);
      ((BANK_HEADER *) event)->data_size += sizeof(BANK32A) + ALIGN8(pbk32a->data_size);
      return pbk32a->data_size;
   } else if (bk_is32((BANK_HEADER *) event)) {
      BANK32 *pbk32 = (BANK32 *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      pbk32->data_size = (DWORD) ((char *) pdata - (char *) (pbk32 + 1));
      if (pbk32->type == TID_STRUCT && pbk32->data_size == 0)
         printf("Warning: TID_STRUCT bank %c%c%c%c has zero size\n", pbk32->name[0], pbk32->name[1], pbk32->name[2], pbk32->name[3]);
      ((BANK_HEADER *) event)->data_size += sizeof(BANK32) + ALIGN8(pbk32->data_size);
      return pbk32->data_size;
   } else {
      BANK *pbk = (BANK *) ((char *) (((BANK_HEADER *) event) + 1) + ((BANK_HEADER *) event)->data_size);
      uint32_t size = (uint32_t) ((char *) pdata - (char *) (pbk + 1));
      if (size > 0xFFFF) {
         printf("Error: Bank size %d exceeds 16-bit limit of 65526, please use bk_init32() to create a 32-bit bank\n", size);
         size = 0;
      }
      pbk->data_size = (WORD) (size);
      if (pbk->type == TID_STRUCT && pbk->data_size == 0)
         printf("Warning: TID_STRUCT bank %c%c%c%c has zero size\n", pbk->name[0], pbk->name[1], pbk->name[2], pbk->name[3]);
      size = ((BANK_HEADER *) event)->data_size + sizeof(BANK) + ALIGN8(pbk->data_size);
      if (size > 0xFFFF) {
         printf("Error: Bank size %d exceeds 16-bit limit of 65526, please use bk_init32() to create a 32-bit bank\n", size);
         size = 0;
      }
      ((BANK_HEADER *) event)->data_size = size;
      return pbk->data_size;
   }
}
 
/********************************************************************/
INT bk_list(const void *event, char *bklist) {                               /* Full event */
   INT nbk;
   BANK *pmbk = NULL;
   BANK32 *pmbk32 = NULL;
   BANK32A *pmbk32a = NULL;
   char *pdata;
 
   /* compose bank list */
   bklist[0] = 0;
   nbk = 0;
   do {
      /* scan all banks for bank name only */
      if (bk_is32a(event)) {
         bk_iterate32a(event, &pmbk32a, &pdata);
         if (pmbk32a == NULL)
            break;
      } else if (bk_is32(event)) {
         bk_iterate32(event, &pmbk32, &pdata);
         if (pmbk32 == NULL)
            break;
      } else {
         bk_iterate(event, &pmbk, &pdata);
         if (pmbk == NULL)
            break;
      }
      nbk++;
 
      if (nbk > BANKLIST_MAX) {
         cm_msg(MINFO, "bk_list", "over %i banks -> truncated", BANKLIST_MAX);
         return (nbk - 1);
      }
      if (bk_is32a(event))
         strncat(bklist, (char *) pmbk32a->name, 4);
      else if (bk_is32(event))
         strncat(bklist, (char *) pmbk32->name, 4);
      else
         strncat(bklist, (char *) pmbk->name, 4);
   } while (1);
   return (nbk);
}
 
/********************************************************************/
INT bk_locate(const void *event, const char *name, void *pdata) {
   BANK *pbk;
   BANK32 *pbk32;
   BANK32A *pbk32a;
   DWORD dname;
 
   if (bk_is32a(event)) {
      pbk32a = (BANK32A *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      while ((DWORD) ((char *) pbk32a - (char *) event) <
             ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
         if (*((DWORD *) pbk32a->name) == dname) {
            *((void **) pdata) = pbk32a + 1;
            if (tid_size[pbk32a->type & 0xFF] == 0)
               return pbk32a->data_size;
            return pbk32a->data_size / tid_size[pbk32a->type & 0xFF];
         }
         pbk32a = (BANK32A *) ((char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size));
      }
   } else if (bk_is32(event)) {
      pbk32 = (BANK32 *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      while ((DWORD) ((char *) pbk32 - (char *) event) <
             ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
         if (*((DWORD *) pbk32->name) == dname) {
            *((void **) pdata) = pbk32 + 1;
            if (tid_size[pbk32->type & 0xFF] == 0)
               return pbk32->data_size;
            return pbk32->data_size / tid_size[pbk32->type & 0xFF];
         }
         pbk32 = (BANK32 *) ((char *) (pbk32 + 1) + ALIGN8(pbk32->data_size));
      }
   } else {
      pbk = (BANK *) (((BANK_HEADER *) event) + 1);
      copy_bk_name((char *) &dname, name);
      while ((DWORD) ((char *) pbk - (char *) event) <
             ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
         if (*((DWORD *) pbk->name) == dname) {
            *((void **) pdata) = pbk + 1;
            if (tid_size[pbk->type & 0xFF] == 0)
               return pbk->data_size;
            return pbk->data_size / tid_size[pbk->type & 0xFF];
         }
         pbk = (BANK *) ((char *) (pbk + 1) + ALIGN8(pbk->data_size));
      }
 
   }
 
   /* bank not found */
   *((void **) pdata) = NULL;
   return 0;
}
 
/********************************************************************/
INT bk_find(const BANK_HEADER *pbkh, const char *name, DWORD *bklen, DWORD *bktype, void **pdata) {
   DWORD dname;
 
   if (bk_is32a(pbkh)) {
      BANK32A *pbk32a = (BANK32A *) (pbkh + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk32a->name) == dname) {
            *((void **) pdata) = pbk32a + 1;
            if (tid_size[pbk32a->type & 0xFF] == 0)
               *bklen = pbk32a->data_size;
            else
               *bklen = pbk32a->data_size / tid_size[pbk32a->type & 0xFF];
 
            *bktype = pbk32a->type;
            return 1;
         }
         pbk32a = (BANK32A *) ((char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size));
      } while ((DWORD) ((char *) pbk32a - (char *) pbkh) < pbkh->data_size + sizeof(BANK_HEADER));
   } else if (bk_is32(pbkh)) {
         BANK32 *pbk32 = (BANK32 *) (pbkh + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk32->name) == dname) {
            *((void **) pdata) = pbk32 + 1;
            if (tid_size[pbk32->type & 0xFF] == 0)
               *bklen = pbk32->data_size;
            else
               *bklen = pbk32->data_size / tid_size[pbk32->type & 0xFF];
 
            *bktype = pbk32->type;
            return 1;
         }
         pbk32 = (BANK32 *) ((char *) (pbk32 + 1) + ALIGN8(pbk32->data_size));
      } while ((DWORD) ((char *) pbk32 - (char *) pbkh) < pbkh->data_size + sizeof(BANK_HEADER));
   } else {
      BANK *pbk = (BANK *) (pbkh + 1);
      copy_bk_name((char *) &dname, name);
      do {
         if (*((DWORD *) pbk->name) == dname) {
            *((void **) pdata) = pbk + 1;
            if (tid_size[pbk->type & 0xFF] == 0)
               *bklen = pbk->data_size;
            else
               *bklen = pbk->data_size / tid_size[pbk->type & 0xFF];
 
            *bktype = pbk->type;
            return 1;
         }
         pbk = (BANK *) ((char *) (pbk + 1) + ALIGN8(pbk->data_size));
      } while ((DWORD) ((char *) pbk - (char *) pbkh) < pbkh->data_size + sizeof(BANK_HEADER));
   }
 
   /* bank not found */
   *((void **) pdata) = NULL;
   return 0;
}
 
/********************************************************************/
INT bk_iterate(const void *event, BANK **pbk, void *pdata) {
   if (*pbk == NULL)
      *pbk = (BANK *) (((BANK_HEADER *) event) + 1);
   else
      *pbk = (BANK *) ((char *) (*pbk + 1) + ALIGN8((*pbk)->data_size));
 
   *((void **) pdata) = (*pbk) + 1;
 
   if ((DWORD) ((char *) *pbk - (char *) event) >= ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
      *pbk = *((BANK **) pdata) = NULL;
      return 0;
   }
 
   return (*pbk)->data_size;
}
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
/********************************************************************/
INT bk_iterate32(const void *event, BANK32 **pbk, void *pdata)
/********************************************************************\
 
  Routine: bk_iterate32
 
  Purpose: Iterate through 32 bit MIDAS banks inside an event
 
  Input:
    void   *event           pointer to the event
    BANK32 **pbk32          must be NULL for the first call to bk_iterate
 
  Output:
    BANK32 **pbk32            pointer to the bank header
    void   *pdata           pointer to data area of the bank
 
  Function value:
    INT    size of the bank in bytes
 
\********************************************************************/
{
   if (*pbk == NULL)
      *pbk = (BANK32 *) (((BANK_HEADER *) event) + 1);
   else
      *pbk = (BANK32 *) ((char *) (*pbk + 1) + ALIGN8((*pbk)->data_size));
 
   *((void **) pdata) = (*pbk) + 1;
 
   if ((DWORD) ((char *) *pbk - (char *) event) >= ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
      *pbk = NULL;
      pdata = NULL;
      return 0;
   }
 
   return (*pbk)->data_size;
}
 
INT bk_iterate32a(const void *event, BANK32A **pbk32a, void *pdata)
/********************************************************************\
 
  Routine: bk_iterate32a
 
  Purpose: Iterate through 64-bit aliggned 32 bit MIDAS banks inside an event
 
  Input:
    void   *event           pointer to the event
    BANK32A **pbk32a        must be NULL for the first call to bk_iterate
 
  Output:
    BANK32A **pbk32         pointer to the bank header
    void   *pdata           pointer to data area of the bank
 
  Function value:
    INT    size of the bank in bytes
 
\********************************************************************/
{
   if (*pbk32a == NULL)
      *pbk32a = (BANK32A *) (((BANK_HEADER *) event) + 1);
   else
      *pbk32a = (BANK32A *) ((char *) (*pbk32a + 1) + ALIGN8((*pbk32a)->data_size));
 
   *((void **) pdata) = (*pbk32a) + 1;
 
   if ((DWORD) ((char *) *pbk32a - (char *) event) >= ((BANK_HEADER *) event)->data_size + sizeof(BANK_HEADER)) {
      *pbk32a = NULL;
      pdata = NULL;
      return 0;
   }
 
   return (*pbk32a)->data_size;
}
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
INT bk_swap(void *event, BOOL force) {
   BANK_HEADER *pbh;
   BANK *pbk;
   BANK32 *pbk32;
   BANK32A *pbk32a;
   void *pdata;
   WORD type;
 
   pbh = (BANK_HEADER *) event;
 
   /* only swap if flags in high 16-bit */
   if (pbh->flags < 0x10000 && !force)
      return 0;
 
   /* swap bank header */
   DWORD_SWAP(&pbh->data_size);
   DWORD_SWAP(&pbh->flags);
 
   pbk = (BANK *) (pbh + 1);
   pbk32 = (BANK32 *) pbk;
   pbk32a = (BANK32A *) pbk;
 
   /* scan event */
   while ((char *) pbk - (char *) pbh < (INT) pbh->data_size + (INT) sizeof(BANK_HEADER)) {
      /* swap bank header */
      if (bk_is32a(event)) {
         DWORD_SWAP(&pbk32a->type);
         DWORD_SWAP(&pbk32a->data_size);
         pdata = pbk32a + 1;
         type = (WORD) pbk32a->type;
      } else if (bk_is32(event)) {
         DWORD_SWAP(&pbk32->type);
         DWORD_SWAP(&pbk32->data_size);
         pdata = pbk32 + 1;
         type = (WORD) pbk32->type;
      } else {
         WORD_SWAP(&pbk->type);
         WORD_SWAP(&pbk->data_size);
         pdata = pbk + 1;
         type = pbk->type;
      }
 
      /* pbk points to next bank */
      if (bk_is32a(event)) {
         pbk32a = (BANK32A *) ((char *) (pbk32a + 1) + ALIGN8(pbk32a->data_size));
         pbk = (BANK *) pbk32a;
      } else if (bk_is32(event)) {
         pbk32 = (BANK32 *) ((char *) (pbk32 + 1) + ALIGN8(pbk32->data_size));
         pbk = (BANK *) pbk32;
      } else {
         pbk = (BANK *) ((char *) (pbk + 1) + ALIGN8(pbk->data_size));
         pbk32 = (BANK32 *) pbk;
      }
 
      switch (type) {
         case TID_UINT16:
         case TID_INT16:
            while ((char *) pdata < (char *) pbk) {
               WORD_SWAP(pdata);
               pdata = (void *) (((WORD *) pdata) + 1);
            }
            break;
 
         case TID_UINT32:
         case TID_INT32:
         case TID_BOOL:
         case TID_FLOAT:
            while ((char *) pdata < (char *) pbk) {
               DWORD_SWAP(pdata);
               pdata = (void *) (((DWORD *) pdata) + 1);
            }
            break;
 
         case TID_DOUBLE:
         case TID_INT64:
         case TID_UINT64:
            while ((char *) pdata < (char *) pbk) {
               QWORD_SWAP(pdata);
               pdata = (void *) (((double *) pdata) + 1);
            }
            break;
      }
   }
 
   return CM_SUCCESS;
}
 
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
/********************************************************************/
 
/********************************************************************\
*                                                                    *
*                 Ring buffer functions                              *
*                                                                    *
* Provide an inter-thread buffer scheme for handling front-end       *
* events. This code allows concurrent data acquisition, calibration  *
* and network transfer on a multi-CPU machine. One thread reads      *
* out the data, passes it vis the ring buffer functions              *
* to another thread running on the other CPU, which can then         *
* calibrate and/or send the data over the network.                   *
*                                                                    *
\********************************************************************/
 
typedef struct {
   unsigned char *buffer;
   unsigned int size;
   unsigned int max_event_size;
   unsigned char *rp;
   unsigned char *wp;
   unsigned char *ep;
} RING_BUFFER;
 
#define MAX_RING_BUFFER 100
 
static RING_BUFFER rb[MAX_RING_BUFFER];
 
static volatile int _rb_nonblocking = 0;
 
#endif                          /* DOXYGEN_SHOULD_SKIP_THIS */
 
/********************************************************************/
int rb_set_nonblocking()
/********************************************************************\
 
  Routine: rb_set_nonblocking
 
  Purpose: Set all rb_get_xx to nonblocking. Needed in multi-thread
           environments for stopping all theads without deadlock
 
  Input:
    NONE
 
  Output:
    NONE
 
  Function value:
    DB_SUCCESS       Successful completion
 
\********************************************************************/
{
   _rb_nonblocking = 1;
 
   return DB_SUCCESS;
}
 
/********************************************************************/
int rb_create(int size, int max_event_size, int *handle)
/********************************************************************\
 
  Routine: rb_create
 
  Purpose: Create a ring buffer with a given size
 
  Input:
    int size             Size of ring buffer, must be larger than
                         2*max_event_size
    int max_event_size   Maximum event size to be placed into
                         ring buffer
  Output:
    int *handle          Handle to ring buffer
 
  Function value:
    DB_SUCCESS           Successful completion
    DB_NO_MEMORY         Maximum number of ring buffers exceeded
    DB_INVALID_PARAM     Invalid event size specified
 
\********************************************************************/
{
   int i;
 
   for (i = 0; i < MAX_RING_BUFFER; i++)
      if (rb[i].buffer == NULL)
         break;
 
   if (i == MAX_RING_BUFFER)
      return DB_NO_MEMORY;
 
   if (size < max_event_size * 2)
      return DB_INVALID_PARAM;
 
   memset(&rb[i], 0, sizeof(RING_BUFFER));
   rb[i].buffer = (unsigned char *) M_MALLOC(size);
   assert(rb[i].buffer);
   rb[i].size = size;
   rb[i].max_event_size = max_event_size;
   rb[i].rp = rb[i].buffer;
   rb[i].wp = rb[i].buffer;
   rb[i].ep = rb[i].buffer;
 
   *handle = i + 1;
 
   return DB_SUCCESS;
}
 
/********************************************************************/
int rb_delete(int handle)
/********************************************************************\
 
  Routine: rb_delete
 
  Purpose: Delete a ring buffer
 
  Input:
    none
  Output:
    int handle       Handle to ring buffer
 
  Function value:
    DB_SUCCESS       Successful completion
 
\********************************************************************/
{
   if (handle < 0 || handle >= MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   M_FREE(rb[handle - 1].buffer);
   rb[handle - 1].buffer = NULL;
   memset(&rb[handle - 1], 0, sizeof(RING_BUFFER));
 
   return DB_SUCCESS;
}
 
/********************************************************************/
int rb_get_wp(int handle, void **p, int millisec)
/********************************************************************\
 
Routine: rb_get_wp
 
  Purpose: Retrieve write pointer where new data can be written
 
  Input:
     int handle               Ring buffer handle
     int millisec             Optional timeout in milliseconds if
                              buffer is full. Zero to not wait at
                              all (non-blocking)
 
  Output:
    char **p                  Write pointer
 
  Function value:
    DB_SUCCESS       Successful completion
 
\********************************************************************/
{
   int h, i;
   unsigned char *rp;
 
   if (handle < 1 || handle > MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   h = handle - 1;
 
   for (i = 0; i <= millisec / 10; i++) {
 
      rp = rb[h].rp;            // keep local copy for convenience
 
      /* check if enough size for wp >= rp without wrap-around */
      if (rb[h].wp >= rp
          && rb[h].wp + rb[h].max_event_size <= rb[h].buffer + rb[h].size - rb[h].max_event_size) {
         *p = rb[h].wp;
         return DB_SUCCESS;
      }
 
      /* check if enough size for wp >= rp with wrap-around */
      if (rb[h].wp >= rp && rb[h].wp + rb[h].max_event_size > rb[h].buffer + rb[h].size - rb[h].max_event_size &&
          rp > rb[h].buffer) {    // next increment of wp wraps around, so need space at beginning
         *p = rb[h].wp;
         return DB_SUCCESS;
      }
 
      /* check if enough size for wp < rp */
      if (rb[h].wp < rp && rb[h].wp + rb[h].max_event_size < rp) {
         *p = rb[h].wp;
         return DB_SUCCESS;
      }
 
      if (millisec == 0)
         return DB_TIMEOUT;
 
      if (_rb_nonblocking)
         return DB_TIMEOUT;
 
      /* wait one time slice */
      ss_sleep(10);
   }
 
   return DB_TIMEOUT;
}
 
/********************************************************************/
int rb_increment_wp(int handle, int size)
/********************************************************************\
 
  Routine: rb_increment_wp
 
  Purpose: Increment current write pointer, making the data at
           the write pointer available to the receiving thread
 
  Input:
     int handle               Ring buffer handle
     int size                 Number of bytes placed at the WP
 
  Output:
    NONE
 
  Function value:
    DB_SUCCESS                Successful completion
    DB_INVALID_PARAM          Event size too large or invalid handle
\********************************************************************/
{
   int h;
   unsigned char *new_wp;
 
   if (handle < 1 || handle > MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   h = handle - 1;
 
   if ((DWORD) size > rb[h].max_event_size) {
      cm_msg(MERROR, "rb_increment_wp", "event size of %d MB larger than max_event_size of %d MB",
             size/1024/1024, rb[h].max_event_size/1024/1024);
      abort();
   }
 
   new_wp = rb[h].wp + size;
 
   /* wrap around wp if not enough space */
   if (new_wp > rb[h].buffer + rb[h].size - rb[h].max_event_size) {
      rb[h].ep = new_wp;
      new_wp = rb[h].buffer;
      assert(rb[h].rp != rb[h].buffer);
   } else
      if (new_wp > rb[h].ep)
         rb[h].ep = new_wp;
 
   rb[h].wp = new_wp;
 
   return DB_SUCCESS;
}
 
/********************************************************************/
int rb_get_rp(int handle, void **p, int millisec)
/********************************************************************\
 
  Routine: rb_get_rp
 
  Purpose: Obtain the current read pointer at which new data is
           available with optional timeout
 
  Input:
    int handle               Ring buffer handle
    int millisec             Optional timeout in milliseconds if
                             buffer is full. Zero to not wait at
                             all (non-blocking)
 
  Output:
    char **p                 Address of pointer pointing to newly
                             available data. If p == NULL, only
                             return status.
 
  Function value:
    DB_SUCCESS       Successful completion
 
\********************************************************************/
{
   int i, h;
 
   if (handle < 1 || handle > MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   h = handle - 1;
 
   for (i = 0; i <= millisec / 10; i++) {
 
      if (rb[h].wp != rb[h].rp) {
         if (p != NULL)
            *p = rb[handle - 1].rp;
         return DB_SUCCESS;
      }
 
      if (millisec == 0)
         return DB_TIMEOUT;
 
      if (_rb_nonblocking)
         return DB_TIMEOUT;
 
      /* wait one time slice */
      ss_sleep(10);
   }
 
   return DB_TIMEOUT;
}
 
/********************************************************************/
int rb_increment_rp(int handle, int size)
/********************************************************************\
 
  Routine: rb_increment_rp
 
  Purpose: Increment current read pointer, freeing up space for
           the writing thread.
 
  Input:
     int handle               Ring buffer handle
     int size                 Number of bytes to free up at current
                              read pointer
 
  Output:
    NONE
 
  Function value:
    DB_SUCCESS                Successful completion
    DB_INVALID_PARAM          Event size too large or invalid handle
 
\********************************************************************/
{
   int h;
 
   unsigned char *new_rp;
   unsigned char *ep;
 
   if (handle < 1 || handle > MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   h = handle - 1;
 
   if ((DWORD) size > rb[h].max_event_size)
      return DB_INVALID_PARAM;
 
   new_rp = rb[h].rp + size;
   ep = rb[h].ep; // keep local copy of end pointer, rb[h].ep might be changed by other thread
 
   /* wrap around if end pointer reached */
   if (new_rp >= ep && rb[h].wp < ep)
      new_rp = rb[h].buffer;
 
   rb[handle - 1].rp = new_rp;
 
   return DB_SUCCESS;
}
 
/********************************************************************/
int rb_get_buffer_level(int handle, int *n_bytes)
/********************************************************************\
 
  Routine: rb_get_buffer_level
 
  Purpose: Return number of bytes in a ring buffer
 
  Input:
    int handle              Handle of the buffer to get the info
 
  Output:
    int *n_bytes            Number of bytes in buffer
 
  Function value:
    DB_SUCCESS              Successful completion
    DB_INVALID_HANDLE       Buffer handle is invalid
 
\********************************************************************/
{
   int h;
 
   if (handle < 1 || handle > MAX_RING_BUFFER || rb[handle - 1].buffer == NULL)
      return DB_INVALID_HANDLE;
 
   h = handle - 1;
 
   if (rb[h].wp >= rb[h].rp)
      *n_bytes = (POINTER_T) rb[h].wp - (POINTER_T) rb[h].rp;
   else
      *n_bytes =
              (POINTER_T) rb[h].ep - (POINTER_T) rb[h].rp + (POINTER_T) rb[h].wp - (POINTER_T) rb[h].buffer;
 
   return DB_SUCCESS;
}
 
 
 
int cm_write_event_to_odb(HNDLE hDB, HNDLE hKey, const EVENT_HEADER* pevent, INT format)
{
   if (format == FORMAT_FIXED) {
      int status;
      status = db_set_record(hDB, hKey, (char *) (pevent + 1), pevent->data_size, 0);
      if (status != DB_SUCCESS) {
         cm_msg(MERROR, "cm_write_event_to_odb", "event %d ODB record size mismatch, db_set_record() status %d", pevent->event_id, status);
         return status;
      }
      return SUCCESS;
   } else if (format == FORMAT_MIDAS) {
      INT size, i, status, n_data;
      int n;
      char *pdata, *pdata0;
 
      char name[5];
      BANK_HEADER *pbh;
      BANK *pbk;
      BANK32 *pbk32;
      BANK32A *pbk32a;
      DWORD bkname;
      WORD bktype;
      HNDLE hKeyRoot, hKeyl, *hKeys;
      KEY key;
 
      pbh = (BANK_HEADER *) (pevent + 1);
      pbk = NULL;
      pbk32 = NULL;
      pbk32a = NULL;
 
      /* count number of banks */
      for (n=0 ; ; n++) {
         if (bk_is32a(pbh)) {
            bk_iterate32a(pbh, &pbk32a, &pdata);
            if (pbk32a == NULL)
               break;
         } else if (bk_is32(pbh)) {
            bk_iterate32(pbh, &pbk32, &pdata);
            if (pbk32 == NULL)
               break;
         } else {
            bk_iterate(pbh, &pbk, &pdata);
            if (pbk == NULL)
               break;
         }
      }
 
      /* build array of keys */
      hKeys = (HNDLE *)malloc(sizeof(HNDLE) * n);
 
      pbk = NULL;
      pbk32 = NULL;
      n = 0;
      do {
         /* scan all banks */
         if (bk_is32a(pbh)) {
            size = bk_iterate32a(pbh, &pbk32a, &pdata);
            if (pbk32a == NULL)
               break;
            bkname = *((DWORD *) pbk32a->name);
            bktype = (WORD) pbk32a->type;
         } else if (bk_is32(pbh)) {
            size = bk_iterate32(pbh, &pbk32, &pdata);
            if (pbk32 == NULL)
               break;
            bkname = *((DWORD *) pbk32->name);
            bktype = (WORD) pbk32->type;
         } else {
            size = bk_iterate(pbh, &pbk, &pdata);
            if (pbk == NULL)
               break;
            bkname = *((DWORD *) pbk->name);
            bktype = (WORD) pbk->type;
         }
 
         n_data = size;
         if (rpc_tid_size(bktype & 0xFF))
            n_data /= rpc_tid_size(bktype & 0xFF);
 
         /* get bank key */
         *((DWORD *) name) = bkname;
         name[4] = 0;
         /* record the start of the data in case it is struct */
         pdata0 = pdata;
         if (bktype == TID_STRUCT) {
            status = db_find_key(hDB, hKey, name, &hKeyRoot);
            if (status != DB_SUCCESS) {
               cm_msg(MERROR, "cm_write_event_to_odb", "please define bank \"%s\" in BANK_LIST in frontend", name);
               continue;
            }
 
            /* write structured bank */
            for (i = 0;; i++) {
               status = db_enum_key(hDB, hKeyRoot, i, &hKeyl);
               if (status == DB_NO_MORE_SUBKEYS)
                  break;
 
               db_get_key(hDB, hKeyl, &key);
 
               /* adjust for alignment */
               if (key.type != TID_STRING && key.type != TID_LINK)
                  pdata = (pdata0 + VALIGN(pdata-pdata0, MIN(ss_get_struct_align(), key.item_size)));
 
               status = db_set_data1(hDB, hKeyl, pdata, key.item_size * key.num_values, key.num_values, key.type);
               if (status != DB_SUCCESS) {
                  cm_msg(MERROR, "cm_write_event_to_odb", "cannot write bank \"%s\" to ODB, db_set_data1() status %d", name, status);
                  continue;
               }
               hKeys[n++] = hKeyl;
 
               /* shift data pointer to next item */
               pdata += key.item_size * key.num_values;
            }
         } else {
            /* write variable length bank  */
            status = db_find_key(hDB, hKey, name, &hKeyRoot);
            if (status != DB_SUCCESS) {
               status = db_create_key(hDB, hKey, name, bktype);
               if (status != DB_SUCCESS) {
                  cm_msg(MERROR, "cm_write_event_to_odb", "cannot create key for bank \"%s\" with tid %d in ODB, db_create_key() status %d", name, bktype, status);
                  continue;
               }
               status = db_find_key(hDB, hKey, name, &hKeyRoot);
               if (status != DB_SUCCESS) {
                  cm_msg(MERROR, "cm_write_event_to_odb", "cannot find key for bank \"%s\" in ODB, after db_create_key(), db_find_key() status %d", name, status);
                  continue;
               }
            }
            if (n_data > 0) {
               status = db_set_data1(hDB, hKeyRoot, pdata, size, n_data, bktype & 0xFF);
               if (status != DB_SUCCESS) {
                  cm_msg(MERROR, "cm_write_event_to_odb", "cannot write bank \"%s\" to ODB, db_set_data1() status %d", name, status);
               }
               hKeys[n++] = hKeyRoot;
            }
         }
      } while (1);
 
      /* notify all hot-lined clients in one go */
      db_notify_clients_array(hDB, hKeys, n*sizeof(INT));
 
      free(hKeys);
 
      return SUCCESS;
   } else {
      cm_msg(MERROR, "cm_write_event_to_odb", "event format %d is not supported (see midas.h definitions of FORMAT_xxx)", format);
      return CM_DB_ERROR;
   }
}
 
/* emacs
 * Local Variables:
 * tab-width: 8
 * c-basic-offset: 3
 * indent-tabs-mode: nil
 * End:
 */