> Thank you for the stack trace, I fixed the buglet that cause midas programs to crash twice,
> once on failure to lock ODB, then call exit() -> atexit() handlers -> cm_check_connect() -> crash on ODB lock 
> failure is the cm_msg() codes.
> 
> Replaced exit(1) with abort(). Could have used kill(getpid(),SIGKILL) to avoid making a core dump, but what the 
> heck...
> 
> Of course this does nothing to the original bug where ODB was locked and nobody will ever unlock it (reboot will 
> unlock it!).
> 
> commit bdd1d7fdc093b5a8d54a1b8467002bb3cac3ac11
> 
> K.O.
> 
> 
> > > > I've uploaded the current core dump at: https://gitlab.com/det-lab/coredumps#.
> > > 
> > > I cannot read the core dump without the corresponding executable (and likely all it's shared libraries).
> > > 
> > > It is best if you run gdb and extract the stack traces on your end.
> > > 
> > > In case you are not familiar with gdb:
> > > 
> > > gdb mserver core # start gdb
> > > bt # stack trace of crashed thread
> > > info thr # get list of threads
> > > thr 1
> > > bt
> > > thr 2
> > > bt
> > > # etc, get stack trace of each thread, there should not be too many of them
> > > 
> > > K.O.
> > 
> > Hi Konstantin, thanks for the instructions.  I do appear to be missing some debug symbols, but the output 
> > looks potentially useful:
> > 
> > [lekhraj@sdfcdmsdaq ~]$ gdb mserver 
> > core.mserver.17468.b174bb74f2bb44f9a0905e78ec6b2677.601715.1728422354000000
> > GNU gdb (GDB) Rocky Linux 10.2-11.1.el9_3
> > ...
> > For help, type "help".
> > Type "apropos word" to search for commands related to "word"...
> > Reading symbols from mserver...
> > [New LWP 601715]
> > 
> > warning: Section `.reg-xstate/601715' in core file too small.
> > [Thread debugging using libthread_db enabled]
> > Using host libthread_db library "/lib64/libthread_db.so.1".
> > Core was generated by `mserver'.
> > Program terminated with signal SIGABRT, Aborted.
> > 
> > warning: Section `.reg-xstate/601715' in core file too small.
> > #0  0x00007fbdeaca154c in __pthread_kill_implementation () from /lib64/libc.so.6
> > Missing separate debuginfos, use: dnf debuginfo-install glibc-2.34-83.el9.12.x86_64 libgcc-11.4.1-
> > 3.el9.x86_64 libstdc++-11.4.1-2.1.el9.x86_64 libzstd-1.5.1-2.el9.x86_64 mysql-libs-8.0.36-1.el9_3.x86_64 
> > openssl-libs-3.0.7-25.el9_3.x86_64 zlib-1.2.11-40.el9.x86_64
> > (gdb)
> > (gdb) bt
> > #0  0x00007fbdeaca154c in __pthread_kill_implementation () from /lib64/libc.so.6
> > #1  0x00007fbdeac54d06 in raise () from /lib64/libc.so.6
> > #2  0x00007fbdeac287f3 in abort () from /lib64/libc.so.6
> > #3  0x0000000000430ee4 in db_lock_database (hDB=hDB@entry=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:2473
> > #4  0x0000000000437e9c in db_find_key (subhKey=0x7ffcc536d348, key_name=0x4687a8 "/Logger/Message file date 
> > format",
> >     hKey=0, hDB=1) at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4099
> > #5  db_find_key (hDB=1, hKey=0, key_name=0x4687a8 "/Logger/Message file date format", 
> > subhKey=0x7ffcc536d348)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4075
> > #6  0x0000000000448297 in db_get_value_string (hdb=1, hKeyRoot=hKeyRoot@entry=0,
> >     key_name=key_name@entry=0x4687a8 "/Logger/Message file date format", index=index@entry=0,
> >     s=s@entry=0x7ffcc536d470, create=create@entry=1, create_string_length=0)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:13950
> > #7  0x000000000040a690 in cm_msg_get_logfile (fac=<optimized out>, t=<optimized out>, 
> > filename=0x7ffcc536d690,
> >     linkname=0x7ffcc536d6b0, linktarget=0x7ffcc536d6d0)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:573
> > #8  0x000000000041a307 in cm_msg_log (message_type=1, facility=0x46db0e "midas",
> >     message=0x7e4290 "[mserver,ERROR] [odb.cxx:2498:db_lock_database,ERROR] cannot lock ODB semaphore, 
> > timeout 10000 ms, exiting...") at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:685
> > #9  0x0000000000421fcd in cm_msg_flush_buffer () at /usr/include/c++/11/bits/basic_string.h:194
> > #10 0x00007fbdeac574dd in __run_exit_handlers () from /lib64/libc.so.6
> > #11 0x00007fbdeac57620 in exit () from /lib64/libc.so.6
> > #12 0x0000000000430f7a in db_lock_database (hDB=hDB@entry=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:2499
> > #13 0x0000000000437e9c in db_find_key (subhKey=0x7ffcc536da04, key_name=0x476a21 "/Alarms/Alarms", hKey=0, 
> > hDB=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4099
> > #14 db_find_key (hDB=1, hKey=hKey@entry=0, key_name=key_name@entry=0x476a21 "/Alarms/Alarms",
> >     subhKey=subhKey@entry=0x7ffcc536da04) at 
> > /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4075
> > #15 0x0000000000455fd2 in al_check () at 
> > /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/alarm.cxx:614
> > --Type <RET> for more, q to quit, c to continue without paging--
> > #16 0x000000000041ff85 in cm_periodic_tasks ()
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:5596
> > #17 0x00000000004235c5 in cm_yield (millisec=millisec@entry=1000)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:5676
> > #18 0x00000000004065c2 in main (argc=<optimized out>, argv=0x7ffcc536e628)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/progs/mserver.cxx:295
> > (gdb) info thr
> >   Id   Target Id                          Frame
> > * 1    Thread 0x7fbdec0b1740 (LWP 601715) 0x00007fbdeaca154c in __pthread_kill_implementation () from 
> > /lib64/libc.so.6
> > (gdb) thr 1
> > [Switching to thread 1 (Thread 0x7fbdec0b1740 (LWP 601715))]
> > #0  0x00007fbdeaca154c in __pthread_kill_implementation () from /lib64/libc.so.6
> > (gdb) bt
> > #0  0x00007fbdeaca154c in __pthread_kill_implementation () from /lib64/libc.so.6
> > #1  0x00007fbdeac54d06 in raise () from /lib64/libc.so.6
> > #2  0x00007fbdeac287f3 in abort () from /lib64/libc.so.6
> > #3  0x0000000000430ee4 in db_lock_database (hDB=hDB@entry=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:2473
> > #4  0x0000000000437e9c in db_find_key (subhKey=0x7ffcc536d348, key_name=0x4687a8 "/Logger/Message file date 
> > format",
> >     hKey=0, hDB=1) at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4099
> > #5  db_find_key (hDB=1, hKey=0, key_name=0x4687a8 "/Logger/Message file date format", 
> > subhKey=0x7ffcc536d348)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4075
> > #6  0x0000000000448297 in db_get_value_string (hdb=1, hKeyRoot=hKeyRoot@entry=0,
> >     key_name=key_name@entry=0x4687a8 "/Logger/Message file date format", index=index@entry=0,
> >     s=s@entry=0x7ffcc536d470, create=create@entry=1, create_string_length=0)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:13950
> > #7  0x000000000040a690 in cm_msg_get_logfile (fac=<optimized out>, t=<optimized out>, 
> > filename=0x7ffcc536d690,
> >     linkname=0x7ffcc536d6b0, linktarget=0x7ffcc536d6d0)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:573
> > #8  0x000000000041a307 in cm_msg_log (message_type=1, facility=0x46db0e "midas",
> >     message=0x7e4290 "[mserver,ERROR] [odb.cxx:2498:db_lock_database,ERROR] cannot lock ODB semaphore, 
> > timeout 10000 ms, exiting...") at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:685
> > #9  0x0000000000421fcd in cm_msg_flush_buffer () at /usr/include/c++/11/bits/basic_string.h:194
> > #10 0x00007fbdeac574dd in __run_exit_handlers () from /lib64/libc.so.6
> > #11 0x00007fbdeac57620 in exit () from /lib64/libc.so.6
> > #12 0x0000000000430f7a in db_lock_database (hDB=hDB@entry=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:2499
> > #13 0x0000000000437e9c in db_find_key (subhKey=0x7ffcc536da04, key_name=0x476a21 "/Alarms/Alarms", hKey=0, 
> > hDB=1)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4099
> > #14 db_find_key (hDB=1, hKey=hKey@entry=0, key_name=key_name@entry=0x476a21 "/Alarms/Alarms",
> >     subhKey=subhKey@entry=0x7ffcc536da04) at 
> > /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/odb.cxx:4075
> > #15 0x0000000000455fd2 in al_check () at 
> > /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/alarm.cxx:614
> > #16 0x000000000041ff85 in cm_periodic_tasks ()
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:5596
> > #17 0x00000000004235c5 in cm_yield (millisec=millisec@entry=1000)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/src/midas.cxx:5676
> > #18 0x00000000004065c2 in main (argc=<optimized out>, argv=0x7ffcc536e628)
> >     at /sdf/home/l/lekhraj/packages/SuperCDMS_DAQ/midas_fork/progs/mserver.cxx:295
> > (gdb)

I checked out the modified version of Midas and recompiled, and am still getting a similar error when I try to run 
odbedit:

[aroberts@sdfcdmsdaq midas]$ odbedit
[ODBEdit,ERROR] [odb.cxx:2043:db_open_database,ERROR] Removed ODB client 'ODBEdit', index 0 because process pid 
1615051 does not exists
[ODBEdit,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Corrected 1 ODB entries
[ODBEdit,INFO] Deleted entry '/System/Clients/1615051' for client 'ODBEdit' because it is not connected to ODB
[ODBEdit,INFO] Client 'ODBEdit' on buffer 'SYSMSG' removed by bm_open_buffer because process pid 1615051 does not 
exist
[ODBEdit,ERROR] [odb.cxx:2489:db_lock_database,ERROR] cannot lock ODB semaphore, timeout 10000 ms, aborting...
Aborted (core dumped)

I'm not sure what's causing the call to lock the database, all I'm doing is typing "odbedit" in the command prompt.

I should add that I followed the instructions for unlocking the ODB, but when I call "odbedit" this error still 
appears:

[aroberts@sdfcdmsdaq midas]$ ipcs -s -t

------ Semaphore Operation/Change Times --------
semid    owner      last-op                    last-changed
4        aroberts    Wed Oct 16 11:44:10 2024   Wed Oct 16 11:44:00 2024

[aroberts@sdfcdmsdaq midas]$ ipcrm sem 4
resource(s) deleted
[aroberts@sdfcdmsdaq midas]$ odbedit
[ODBEdit,ERROR] [odb.cxx:2043:db_open_database,ERROR] Removed ODB client 'ODBEdit', index 0 because process pid 
1617050 does not exists
[ODBEdit,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Corrected 1 ODB entries
[ODBEdit,INFO] Deleted entry '/System/Clients/1617050' for client 'ODBEdit' because it is not connected to ODB
[ODBEdit,INFO] Client 'ODBEdit' on buffer 'SYSMSG' removed by bm_open_buffer because process pid 1617050 does not 
exist
[ODBEdit,ERROR] [odb.cxx:2489:db_lock_database,ERROR] cannot lock ODB semaphore, timeout 10000 ms, aborting...
Aborted (core dumped)

> [aroberts@sdfcdmsdaq midas]$ odbedit
> [ODBEdit,ERROR] [odb.cxx:2043:db_open_database,ERROR] Removed ODB client 'ODBEdit', index 0 because process pid 
> 1615051 does not exists
> [ODBEdit,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
> [ODBEdit,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
> [ODBEdit,INFO] Corrected 1 ODB entries
> [ODBEdit,INFO] Deleted entry '/System/Clients/1615051' for client 'ODBEdit' because it is not connected to ODB
> [ODBEdit,INFO] Client 'ODBEdit' on buffer 'SYSMSG' removed by bm_open_buffer because process pid 1615051 does not 
> exist

so far, so good, we connected to ODB (lock was not stuck), cleared out client "odbedit" with pid 1615051 that crashed 
without properly disconnecting. ODB semaphore is working correctly.

> [ODBEdit,ERROR] [odb.cxx:2489:db_lock_database,ERROR] cannot lock ODB semaphore, timeout 10000 ms, aborting...
> Aborted (core dumped)

suddenly, an ODB semaphore timeout...

can you post the stack trace from this core dump? I am pretty sure it will be boring, but just in case...

K.O.

> suddenly, an ODB semaphore timeout...

I am wondering if something bizarre is going on, like the system clock going backwards. I heard of things like that 
happening in virtual environments.

https://stackoverflow.com/questions/4801122/how-to-stop-time-from-running-backwards-on-linux

I added some debugging information to the semaphore locking code. Please update to commit 
eb625af119067f6d702211542d88a28ccb57ad2c of src/system.cxx (plus small change in include/msystem.h) and try again.

Now for each timeout it will print detailed syscall and timing information, if time goes backwards, it should catch it.

K.O.

> Now for each timeout it will print detailed syscall and timing information, if time goes backwards, it should catch it.

It appears that time is moving forward:

[aroberts@sdfcdmsdaq build]$ odbedit
[ODBEdit,ERROR] [odb.cxx:2043:db_open_database,ERROR] Removed ODB client 'ODBEdit', index 0 because process pid 1617119 does 
not exists
[ODBEdit,INFO] Removed open record flag from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Removed exclusive access mode from "/Experiment/Security/RPC hosts/Allowed hosts"
[ODBEdit,INFO] Corrected 1 ODB entries
[ODBEdit,INFO] Deleted entry '/System/Clients/1617119' for client 'ODBEdit' because it is not connected to ODB
[ODBEdit,INFO] Client 'ODBEdit' on buffer 'SYSMSG' removed by bm_open_buffer because process pid 1617119 does not exist
[local:amy_test:S]/>ss_semaphore_wait_for: semop/semtimedop(5) returned -1, errno 11 (Resource temporarily unavailable), 
start time 0xd4fd98f6, now 0xd4fdc0ef, dt 0x000027f9, timeout 0x00002710 ms, SEMAPHORE TIMEOUT!
[ODBEdit,ERROR] [odb.cxx:2489:db_lock_database,ERROR] cannot lock ODB semaphore, timeout 10000 ms, aborting...
Aborted (core dumped)

After following Konstantin's debugging suggestions, I thought I would try to replicate 
the issue on my own computer.  My hope was that I could provide instructions for 
replicating the bug so that the MIDAS team could try debugging things more easily.

However, when I ran the current version of MIDAS in a Rocky 9.4 VM on my laptop (both 
VMWare and VirtualBox), mserver and odbedit ran just fine (!).

I'm currently trying to find out if there's a way to compare the VMs on my machine and 
the machine that's being problematic, I'll report back if I learn anything.

Dear all,

we are trying to build Midas events on FPGAs and send them directly to the midas
ring buffer via copy_n. According to the wiki
https://midas.triumf.ca/MidasWiki/index.php/Event_Structure Event Data Size is:
"The event data size contains the size of the event in bytes excluding the
header." and All Bank Size is: "Size in bytes of the following data plus the
size of the bank header". So are they actually the same or what header is the
header in the first sentence also the bank header?

Cheers,
Marius

 

Thanks for pointing out this error. The "All Bank Size" contains the size of all banks including their 
bank headers, but NOT the global bank header itself. I modified the documentation accordingly.

If you want to study the C code which tells you how to fill these headers, look at midas.cxx line 
14788.

Best,
Stefan

> Dear all,
> 
> we are trying to build Midas events on FPGAs and send them directly to the midas
> ring buffer via copy_n. According to the wiki
> https://midas.triumf.ca/MidasWiki/index.php/Event_Structure Event Data Size is:
> "The event data size contains the size of the event in bytes excluding the
> header." and All Bank Size is: "Size in bytes of the following data plus the
> size of the bank header". So are they actually the same or what header is the
> header in the first sentence also the bank header?
> 
> Cheers,
> Marius
> 
>  

> Thanks for pointing out this error. The "All Bank Size" contains the size of all banks including their 
> bank headers, but NOT the global bank header itself. I modified the documentation accordingly.
> 
> If you want to study the C code which tells you how to fill these headers, look at midas.cxx line 
> 14788.

Also take a look at the midas event parser in ROOTANA midasio.cxx, the code is pretty clean c++
https://bitbucket.org/tmidas/rootana/src/master/libMidasInterface/midasio.cxx

But Stefan's code in midas.cxx and in the documentation is the authoritative information.

K.O.

Dear all,
       I'm writing a very simple device driver starting from the nulldev.cxx 
example. 

I define an equipment as reported at the end of this message then, if all 
variables are Input variables, I define them with:

  mdevice device("myEquimpent", "Input", DF_INPUT | DF_MULTITHREAD, mydevice);
  device.define_var("Var1", 0.1);
  device.define_var("Var2", 0.1);
  ...

If all variables are output variables, I define them with:

  mdevice device("myEquipment", "Output", DF_OUTPUT | DF_MULTITHREAD, mydevice);
  device.define_var("Var1", 0.1);
  device.define_var("Var2", 0.1);

But I don't know what to do if I have mixed input and output variables in the same 
device. I think I can do:

  mdevice device_in("myEquipment", "Input", DF_INPUT | DF_MULTITHREAD, mydevice);
  device.define_var("Var1", 0.1);

  mdevice device_out("myEquipment", "Output", DF_OUTPUT | DF_MULTITHREAD, 
mydevice);
  device.define_var("Var2", 0.1);

but in this case, inside mydevice.cxx, I don't know how to distinguish Var1 and 
Var2, because they are both identified as channel 0.

Do you have any suggestion?

Thank you,
      Francesco




-------------------------------------------------------------------



   {"SourceMotor",                       /* equipment name */
    {7, 0,                       /* event ID, trigger mask */
     "SYSTEM",                  /* event buffer */
     EQ_SLOW,                   /* equipment type */
     0,                         /* event source */
     "MIDAS",                   /* format */
     TRUE,                      /* enabled */
     RO_ALWAYS,        /* read when running and on transitions */
     60000,                     /* read every 60 sec */
     0,                         /* stop run after this event limit */
     0,                         /* number of sub events */
     1,                         /* log history every event */
     "", "", ""} ,
    cd_multi_read,                 /* readout routine */
    cd_multi,                      /* class driver main routine */
   },

The "multi" class driver takes care of that. It properly calls the SET and GET functions 
with the correct index. The code for that is in multi.cxx:105:

 device_driver(m_info->driver_input[i], CMD_GET,
               i - m_info->channel_offset_input[i],
               &m_info->var_input[i]);

The "channel_offset_input" and "channel_offset_output" store the first index of the 
channel in the overall ODB array (where inputs and outputs are staggered together), so 
the device_driver is always called with an index 0...n each for input and output, but 
with different commands CMD_GET and CMD_SET. You can take the mscbdev.cxx device driver 
as a working example.

Stefan

Dear all, does anyone have an example of for a device driver using modbus or modbus tcp to communicate with a device and willing to share it? Thanks.

> Dear all, does anyone have an example of for a device driver using modbus or modbus tcp to communicate with a device and willing to share it? Thanks.

I have not seen any modbus devices recently, so all my code and examples are quite old.

Basic modbus/tcp communication driver is in the midas repo:

daq00:midas$ find . | grep -i modbus
./drivers/divers/ModbusTcp.cxx
./drivers/divers/ModbusTcp.h
daq00:midas$ 

This driver worked for communication to a modbus PLC (T2K/ND280/TPC experiment in Japan).

An example program to use this driver and test modbus communication is here:
https://bitbucket.org/expalpha/agdaq/src/master/src/modbus.cxx

Because at the end, we do not have any modbus devices in any recent experiment,
I do not have any example of using this driver in the midas frontend. Sorry.

K.O.

let notification = new Notification('MIDAS Message', {
    body: text,
});

<button class="mbutton" onclick="Notification.requestPermission()">Request notification permission</button>

Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
expected result (bar is gone, foo is still there).

I'm on the develop branch.

> Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
> mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
> stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
> expected result (bar is gone, foo is still there).
> 
> I'm on the develop branch.

I think I can confirm this. Created a bug report on bitbucket:

https://bitbucket.org/tmidas/midas/issues/148/mhttpd-odb-editor-deletes-wrong-symlink

K.O.

> > Asume you have a variable foo and a link bar -> foo. When you go to the ODB in
> > mhttpd, click "Delete" and select bar, it actually deletes foo. bar stays,
> > stating "<cannot resolve link>". Trying the same in odbedit with rm gives the
> > expected result (bar is gone, foo is still there).
> > 
> > I'm on the develop branch.
> 
> I think I can confirm this. Created a bug report on bitbucket:
> 
> https://bitbucket.org/tmidas/midas/issues/148/mhttpd-odb-editor-deletes-wrong-symlink
> 
> K.O.

I fixed this and committed the change. Took me a while since it was in KO's code.

Stefan

Another problem while using odbedit.
I tried the batch mode of "odbedit". I created a key as "/A_Str" by mistake and 
wanted to delete it. Then "odbedit" failed to accept the "Return" key. Please see 
the screen-shot attached. :-(