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Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!versatc!mips!prls!philabs!ttidca!quad1!avatar!kory
From: kory@avatar.UUCP (Kory Hamzeh)
Newsgroups: comp.unix.questions,comp.unix.xenix
Subject: Re: help determining child process status
Summary: Try kill(pid, 0)
Message-ID: <123@avatar.UUCP>
Date: 9 Jun 89 00:14:31 GMT
References: <1854@leah.Albany.Edu>
Distribution: usa
Organization: Kory Hamzeh, Canoga Park, Ca, USA
Lines: 26

In article <1854@leah.Albany.Edu>, msb62@leah.Albany.Edu (Mitch Baltuch) writes:
> I am running SCO Xenix v2.3 on a Zenith Z386, using their v2.3 development
> toolkit.  My problem is that I have a parent task which forks a number
> of tasks.  Some of these tasks spawn other tasks based on asynchronous
> events, so that the number and duration of these tasks cannot be determined.
> I am looking for a way that a task can tell when all its children have
> terminated.  This is complicated by the fact that one or two processes may
> not terminate by themselves and cannot be terminated until all other
> processes have exited. I have not been able to find a convenient way to
> accomplish this.  Any suggestions?

If you know the pids of the sub-tasks, you can do a kill(pid, 0). Under
Xenix, kill(pid, 0) returns 0 (zero) if the task is still running or 
-1 if the task is terminated. I have tried this under Xenix and it works.
However, I know that it is not very portable to other flavors of Unix.

Hope this helps.

--kory



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