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Full Discussion: retrieve process state programatically
Top Forums UNIX for Advanced & Expert Users retrieve process state programatically Post 302388844 by Andre_Merzky on Thursday 21st of January 2010 03:28:10 PM
Old 01-21-2010
Hi Loic, thanks for your answer!

Quote:
Originally Posted by Loic Domaigne
Hello Andre,

The two ideas that come to my mind:

1) You create a process responsible for spawing your applications to monitor. That way, you create the parent-child relationship that you need for using waitpaid() with the options WUNTRACED and WCONTINUED.
Alas, this is not a viable option in my use case: I have no control over the original parent, nor over spawning process. Well, in those cases where I do have that control, waitpid works nicely of course. The other cases (no control) cause the headache ;-)

Quote:
2) You use the appropriate popen("ps...") code depending on which platform you are running. This can be achieved using old plain #ifdef, or using a strategy pattern.
That is what I do right now, but its ugly, and broken. For example:

Code:
> sleep 1000 &

> ps -ewwo pid=,uid=,state=,command= | grep 1000
16027   501 S    sleep 1000

> fg
sleep 1000
^Z
[1]  + 16027 Suspended                     sleep 1000

> ps -ewwo pid=,uid=,state=,command= | grep 1000
16027   501 S    sleep 1000

So, the process 'sleep' is active in the first case, and suspended in the second. PS reports the same state - I have no means to distinguish. This seems to be valid for all apps which are sleeping or blocking in any way (which are many in our environment, mostly waiting for IO).

FWIW: the above is on MacOS.

Best, Andre
 

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LEARN ABOUT OPENDARWIN

strace-log-merge

STRACE-LOG-MERGE(1)					      General Commands Manual					       STRACE-LOG-MERGE(1)

NAME

       strace-log-merge - merge strace -ff -tt output

SYNOPSIS

       strace-log-merge STRACE_LOG

       strace-log-merge --help

DESCRIPTION

       strace-log-merge  merges  the output of strace -ff -tt[t] command, prepending PID to each line and sorting the result using time stamp as a
       key.

OPTIONS

       --help Show program usage and exit.

       STRACE_LOG
	      Output file name prefix of files produced by a strace -ff -tt[t] command.

EXIT STATUS

       0      Success

       Non-zero
	      Error occurred: either no argument specified (in that case a usage is printed), or something went wrong  during  the  processing	of
	      STRACE_LOG.*  files.

USAGE EXAMPLE

       $ strace -o sleepy -ff -tt -e trace=execve,nanosleep 
	       sh -c 'sleep 0.1 & sleep 0.2 & sleep 0.3'
       $ strace-log-merge sleepy | fold -w 72 -s
       13475 21:13:52.040837 execve("/bin/sh", ["sh", "-c", "sleep 0.1 & sleep
       0.2 & sleep 0."...], 0x7ffde54b2450 /* 33 vars */) = 0
       13478 21:13:52.044050 execve("/bin/sleep", ["sleep", "0.3"],
       0x5631be4f87a8 /* 33 vars */) = 0
       13476 21:13:52.044269 execve("/bin/sleep", ["sleep", "0.1"],
       0x5631be4f87a8 /* 33 vars */) = 0
       13477 21:13:52.044389 execve("/bin/sleep", ["sleep", "0.2"],
       0x5631be4f87a8 /* 33 vars */) = 0
       13478 21:13:52.046207 nanosleep({tv_sec=0, tv_nsec=300000000}, NULL) = 0
       13476 21:13:52.046303 nanosleep({tv_sec=0, tv_nsec=100000000}, NULL) = 0
       13477 21:13:52.046318 nanosleep({tv_sec=0, tv_nsec=200000000}, NULL) = 0
       13476 21:13:52.146852 +++ exited with 0 +++
       13475 21:13:52.146942 --- SIGCHLD {si_signo=SIGCHLD,
       si_code=CLD_EXITED, si_pid=13476, si_uid=1000, si_status=0, si_utime=0,
       si_stime=0} ---
       13477 21:13:52.247782 +++ exited with 0 +++
       13475 21:13:52.247885 --- SIGCHLD {si_signo=SIGCHLD,
       si_code=CLD_EXITED, si_pid=13477, si_uid=1000, si_status=0, si_utime=0,
       si_stime=0} ---
       13478 21:13:52.347680 +++ exited with 0 +++
       13475 21:13:52.347786 --- SIGCHLD {si_signo=SIGCHLD,
       si_code=CLD_EXITED, si_pid=13478, si_uid=1000, si_status=0, si_utime=0,
       si_stime=0} ---
       13475 21:13:52.348069 +++ exited with 0 +++

NOTES

       strace-log-merge  does  not work well with strace logs generated by strace -tt invocation that pass midnight, as those lack the information
       required for the proper sorting.  Employing the -ttt option in the respective strace invocation should solve the problem.

BUGS

       strace-log-merge does not perform any checks whether the files specified are in the correct format and implies that only files from a  sin-
       gle strace session match STRACE_LOG.*  glob pattern.

HISTORY

       The initial version of strace-log-merge was written by Denys Vlasenko in 2012.

REPORTING BUGS

       Problems with strace-log-merge should be reported to the strace mailing list at <strace-devel@lists.sourceforge.net>.

SEE ALSO

       strace(1)

strace UNKNOWN							    2018-04-11						       STRACE-LOG-MERGE(1)
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