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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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sleep(3)						     Library Functions Manual							  sleep(3)

NAME
sleep - Suspends execution for an interval of time LIBRARY
Standard C Library (libc.a) Threads Library (libpthreads.a) SYNOPSIS
#include <unistd.h> unsigned int sleep ( unsigned int seconds ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: sleep(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the number of seconds to sleep. DESCRIPTION
The sleep() function suspends execution of a process for the interval specified by the seconds parameter. The suspension time may be longer than requested due to the scheduling of other activity by the system. In a multi-threaded environment, the sleep() function is redefined so that only the calling thread is suspended. RETURN VALUES
If the sleep() function returns because the requested time has elapsed, it returns 0 (zero). If the sleep() function returns because it caught a signal, the function returns the number of seconds remaining in the suspension. RELATED INFORMATION
Commands: wall(1), shutdown(8) sleep(1) Functions: sigaction(2), alarm(3), pause(3) Standards: standards(5) delim off sleep(3)
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