 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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 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, 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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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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27 Sep 2013, Konstantin Olchanski, Info, ODB JSON support
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> odbedit can now save ODB in JSON-formatted files.
>
> JSON encoding implementation follows specifications at:
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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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09 Oct 2013, Konstantin Olchanski, Info, ODB JSON support
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> > odbedit can now save ODB in JSON-formatted files.
> A bug was reported in my JSON ODB encoder: NaN values are not encoded correctly.
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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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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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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, 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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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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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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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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14 Nov 2013, Konstantin Olchanski, Forum, Installation problem
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> #include "use.h"
> { USED int i=foo(); }
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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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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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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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