 16 Dec 2013, Konstantin Olchanski, Info, MIDAS on ARM
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I added MIDAS Makefile rules for building ARM binaries: "make linuxarm" and "make cleanarm" will create
(and clean) object files, libraries and executables under "linux-arm" using the TI Sitara ARM SDK or the
Yocto SDK ARM cross-compilers (GCC 4.7.x and 4.8.x respectively). (Makefile rules for building PPC
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28 Nov 2013, Konstantin Olchanski, Info, Audit of fixed size arrays
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In one of the experiments, we hit a long time bug in mdump - there was an array of 32 equipments and if
there were more than 32 entries under /equipment, it would overrun and corrupt memory. Somehow this
only showed up after mdump was switched to c++. The solution was to use std::vector instead of fixed
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20 Nov 2013, Konstantin Olchanski, Bug Report, Too many bm_flush_cache() in mfe.c
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I was looking at something in the mserver and noticed that for remote frontends, for every periodic event,
there are about 3 RPC calls to bm_flush_cache().
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 21 Nov 2013, Stefan Ritt, Bug Report, Too many bm_flush_cache() in mfe.c
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> And I think that works just fine for frontends directly connected to the shared memory, one call to
> bm_flush_buffer() should be sufficient.
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15 Nov 2013, Konstantin Olchanski, Bug Report, stuck data buffers
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We have seen several times a problem with stuck data buffers. The symptoms are very confusing -
frontends cannot start, instead hang forever in a state very hard to kill. Also "mdump -s -d -z
BUF03" for the affected data buffers is stuck.
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14 Nov 2013, Konstantin Olchanski, Bug Report, MacOS10.9 strlcpy() problem
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On MacOS 10.9 MIDAS will crashes in strlcpy() somewhere inside odb.c. We think this is because strlcpy()
in MacOS 10.9 was changed to abort() if input and output strings overlap. For overlapping memory one is
supposed to use memmove(). This is fixed in current midas, for older versions, you can try this patch:
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09 Nov 2013, Razvan Stefan Gornea, Forum, Installation problem 
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Hi,
I run into problems while trying to install Midas on Slackware 14.0. In the past
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10 Nov 2013, Stefan Ritt, Forum, Installation problem
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Seems to me a problem with the ODBC library, so maybe Konstantin can comment.
/Stefan |
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11 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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> I run into problems while trying to install Midas on Slackware 14.0.
Thank you for reporting this. We do not have any slackware computers so we cannot see these message usually.
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11 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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> > I run into problems while trying to install Midas on Slackware 14.0.
>
> b) an actual error in fal.c:
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13 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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> > I run into problems while trying to install Midas on Slackware 14.0.
>
> Thank you for reporting this. We do not have any slackware computers so we cannot see these message usually.
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13 Nov 2013, Stefan Ritt, Forum, Installation problem
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> got around to look at compile messages on ubuntu: in addition to "variable 'error' set but not used" we have these:
>
> warning: ignoring return value of 'ssize_t write(int, const void*, size_t)'
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14 Nov 2013, Razvan Stefan Gornea, Forum, Installation problem
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Hi, Thanks a lot for the response! Yes to search packages and list their content in Slackware it is pretty similar to your illustration. Slackware seems
to use iODBC in which case it would link with -liodbc I guess.
root@lheppc83:~# slackpkg file-search sql.h |
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14 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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# slackpkg file-search sql.h
[ installed ] - libiodbc-3.52.7-x86_64-2
...
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12 Nov 2013, Stefan Ritt, Forum, Installation problem
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The warnings with the set but unused variables are real. While John O'Donnell proposed:
==========
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14 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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> #include "use.h"
> { USED int i=foo(); }
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22 Oct 2013, Konstantin Olchanski, Info, midas programs "auto start", etc
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MIDAS "programs" settings include: /programs/xxx/"auto start", "auto restart" and "auto stop". What do
they do?
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06 Nov 2013, Stefan Ritt, Info, midas programs "auto start", etc
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> "programs auto start" : works but has strange interactions and side effects, do not use it.
> "programs auto stop" : works, can be used to stop programs at the end of run (but what for?)
> "programs auto restart" : works, seems to work correctly, can be used to auto restart mlogger, frontends,
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25 Oct 2013, Konstantin Olchanski, Bug Fix, fixed mlogger run auto restart bug
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A problem existed in midas for some time: when recording long data sets of time (or event) limited runs
with logger run auto restart set to "yes", the runs will automatically stop and restart as expected, but
sometimes the run will stop and never restart and beam will be lost until the experiment operator on shift
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25 Oct 2013, Stefan Ritt, Bug Fix, fixed mlogger run auto restart bug
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> A problem existed in midas for some time: when recording long data sets of time (or event) limited runs
> with logger run auto restart set to "yes", the runs will automatically stop and restart as expected, but
> sometimes the run will stop and never restart and beam will be lost until the experiment operator on shift
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28 Oct 2013, Konstantin Olchanski, Bug Fix, fixed mlogger run auto restart bug
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>
> More generally I kind of consider the mlogger auto restart facility as deprecated. It works in the background and the operator does not have a clue
> what is going on. We use now the sequencer to achieve exactly the same functionality.
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28 Oct 2013, Stefan Ritt, Bug Fix, fixed mlogger run auto restart bug
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> Does the sequencer survive a crash or a restart of mhttpd?
Yes. Of course runs will not be started/stopped when mhttpd is not running, but when you restart it gracefully continues where it stopped, since all variables |
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01 Oct 2013, Konstantin Olchanski, Info, MacOS select() problem
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The following code found in mhttpd does not work on MacOS (BSD UNIX).
On Linux, the do-loop will finish after 2 seconds as expected. On MacOS (and other BSD systems), it will
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25 Oct 2013, Konstantin Olchanski, Info, MacOS select() problem
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> The following code found in mhttpd does not work on MacOS (BSD UNIX). ...
Because of this problem, on MacOS, run transitions can get stuck forever - most timeouts do not work. (Specifically, recv_string() never times out)
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22 Oct 2013, Konstantin Olchanski, Info, audit of db_get_record()
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Record-oriented ODB functions db_create_record(), db_get_record(), db_check_record() and
db_set_record() require special attention to the consistency between their "C struct"s (usually defined in
midas.h), their initialization strings (usually defined in midas.h) and the contents of ODB.
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21 Aug 2013, Konstantin Olchanski, Info, Documentation for ODBGet() & co, Javascript and AJAX functions.
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The bulk of the MIDAS AJAX and Javascript functions is now documented on the MIDAS Wiki:
https://midas.triumf.ca/MidasWiki/index.php/Mhttpd.js
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22 Aug 2013, Konstantin Olchanski, Info, Documentation for ODBGet() & co, Javascript and AJAX functions.
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> The bulk of the MIDAS AJAX and Javascript functions is now documented on the MIDAS Wiki:
>
> https://midas.triumf.ca/MidasWiki/index.php/Mhttpd.js
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25 Sep 2013, Konstantin Olchanski, Info, Documentation for ODBGet() & co, Javascript and AJAX functions.
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> > The bulk of the MIDAS AJAX and Javascript functions is now documented on the MIDAS Wiki:
> >
> > https://midas.triumf.ca/MidasWiki/index.php/Mhttpd.js
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13 Sep 2013, Thomas Lindner, Bug Report, mhttpd truncates string variables to 32 characters
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I find that new mhttpd has strange behaviour for ODB strings.
- I create a new STRING variable in ODB through mhttpd. It defaults to size 32.
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13 Sep 2013, Konstantin Olchanski, Bug Report, mhttpd truncates string variables to 32 characters
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I can confirm part of the problem - the new inline-edit function - after you finish editing - shows you what you
have typed, not what's actually in ODB - at the very end it should do an ODBGet() to load the actual ODB
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18 Sep 2013, Konstantin Olchanski, Bug Report, mhttpd truncates string variables to 32 characters
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I confirm the second part of the problem.
Inline edit uses ODBSet(), which uses the "jset" AJAX call to mhttpd which does not extend string variables.
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24 Sep 2013, Stefan Ritt, Bug Report, mhttpd truncates string variables to 32 characters
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> This is the jset code. The best I can tell it truncates string variables to the existing size in ODB:
>
> db_find_key(hDB, 0, str, &hkey)
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24 Sep 2013, Stefan Ritt, Bug Report, mhttpd truncates string variables to 32 characters
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Actually this was no bug, but a missing feature. Strings were never meant to be extended via the web interface.
Now I added that feature to the current version. Please check it.
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14 Sep 2013, Konstantin Olchanski, Info, mktime() and daylight savings time
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I would like to share with you a silly problem with mktime() and daylight savings time (Summer
time/Winter time) that I have run into while working on the mhttpd history query page.
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24 Sep 2013, Stefan Ritt, Info, mktime() and daylight savings time
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I vaguely remember that I had a similar problem with ELOG. The solution was to call tzset() at the beginning of the program. The man page says that
this function is called automatically by programs using time zones, but apparently it is not. Can you try that? There is also the TZ environment
variable and /etc/localtime. I never understood the details, but playing with these things can influence mktime() and localtime().
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24 Sep 2013, Konstantin Olchanski, Info, mktime() and daylight savings time
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> I vaguely remember that I had a similar problem with ELOG. The solution was to call tzset() at the beginning of the program. The man page says that
> this function is called automatically by programs using time zones, but apparently it is not. Can you try that? There is also the TZ environment
> variable and /etc/localtime. I never understood the details, but playing with these things can influence mktime() and localtime().
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24 Sep 2013, Stefan Ritt, Info, mktime() and daylight savings time
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> > I vaguely remember that I had a similar problem with ELOG. The solution was to call tzset() at the beginning of the program. The man page says that
> > this function is called automatically by programs using time zones, but apparently it is not. Can you try that? There is also the TZ environment
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24 Sep 2013, Stefan Ritt, Info, mktime() and daylight savings time
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> > > I vaguely remember that I had a similar problem with ELOG. The solution was to call tzset() at the beginning of the program. The man page says that
> > > this function is called automatically by programs using time zones, but apparently it is not. Can you try that? There is also the TZ environment |
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13 Sep 2013, Carl Blaksley, Forum, MIDAS CITATION
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Dear MIDAS programmers,
I have been using your software in my lab (APC, Paris)
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13 Sep 2013, Konstantin Olchanski, Forum, MIDAS CITATION
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>
> I have been using your software in my lab (APC, Paris)
> to run our data acqusition system. It is very robust and flexible.s
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13 Sep 2013, Stefan Ritt, Forum, MIDAS CITATION
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> Dear MIDAS programmers,
>
> I have been using your software in my lab (APC, Paris)
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26 Aug 2013, Konstantin Olchanski, Bug Fix, Enable cross-site requests in mhttpd
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Javascript "AJAX" functions (and their MIDAS wrappers - ODBGet/ODBSet) are subject to something called
"same origin policy" intended to prevent something called "cross-site scripting attacks", i.e. see
http://en.wikipedia.org/wiki/Same-origin_policy
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02 Aug 2013, Konstantin Olchanski, Bug Fix, multithreaded run transitions work!
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As of commit
https://bitbucket.org/tmidas/midas/commits/dfa5fb1a93cae11a2960d441044c7fd277e1f0ec
(we are now liberated from the tyranny of SVN IDs),
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26 Jul 2013, Konstantin Olchanski, Bug Report, odbedit fixed size buffer overrun
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odbedit uses a fixed size buffer for ODB data. If an array in ODB is bugger than this size,
db_get_data() correctly returns DB_TRUNCATED and there is no memory overwrite, but the following
code for printing the data does not know about this truncation and proceeds printing memory
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26 Jul 2013, Konstantin Olchanski, Bug Report, abort on buffer overflow in odb.c::merge_records()
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The odb.c function merge_records() has a fixed size array of 10000 bytes to handle the data and it
aborts with an assert() if passed data bigger than that. It is called from db_create_record() which
already allocates a data buffer of correct size for it's operations.
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22 Jul 2013, Konstantin Olchanski, Info, MidasWiki at TRIUMF
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We are happy to announce the creation of the MidasWiki at TRIUMF (https://midas.triumf.ca) as the
new location of MIDAS documentation, user instructions, examples, etc.
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24 Jul 2013, Konstantin Olchanski, Info, MidasWiki at TRIUMF
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> We are happy to announce the creation of the MidasWiki at TRIUMF
> https://midas.triumf.ca
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22 Jul 2013, Konstantin Olchanski, Info, MIDAS source code converted from SVN to GIT
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The MIDAS source code repository was converted from SVN to GIT, hosted as bitbucket:
https://bitbucket.org/tmidas.
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22 Jul 2013, Stefan Ritt, Info, MIDAS source code converted from SVN to GIT
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Konstantin forgot to tell people outside of TRIUMF how to get the newest version of MIDAS. Here it is:
$ git clone https://bitbucket.org/tmidas/midas.git
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