Assume I spawn a process on (csh) command line, like
which creates a process with id 1234. Now, I can suspend/resume that process with
and can query the process state via 'jobs' or 'ps. How can I though query that state programatically (UNIX/POSIX system, no /proc/ available)?
The only call closest to the problem seems waitpid(), which can use WUNTRACED to get notifications on some signals, including SIGSTOP. That seems to work only for processes spawned within the same application - so I would not be able to write a tool which, for the example above, works like
Another option is to do something like
and to grep the output - but ps output is not well standardized (well, it actually is, see ps, but the various implementations do not necessarily adhere to the spec), and also this seems a very cumbersome way to do that. Not to speak of performance...
Any better ideas? The solution ideally should work on MacOS, BSD, Linux, and AIX.
Thanks, Andre.
PS.: yes, I grep'ed the forum: huge amount of related posts, and I may well have missed relevant discussions in the noise. My apologies, and thanks for any pointers...
Last edited by Andre_Merzky; 01-21-2010 at 09:46 AM..
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