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From: allbery@ncoast.UUCP (Brandon Allbery)
Newsgroups: net.sources
Subject: Detecting running processes... this one's portable
Message-ID: <1325@ncoast.UUCP>
Date: Sun, 27-Jul-86 10:36:31 EDT
Article-I.D.: ncoast.1325
Posted: Sun Jul 27 10:36:31 1986
Date-Received: Thu, 31-Jul-86 02:56:16 EDT
References: <515@cubsvax.UUCP> <212@amc.UUCP>
Reply-To: allbery@ncoast.UUCP (Brandon Allbery)
Followup-To: net.sources
Organization: Cleveland Public Access UNIX (ncoast), Cleveland, OH
Lines: 44

Expires:

Quoted from <212@amc.UUCP> ["Re: csh-script to run a job after an existing job terminates"], by stan@amc.UUCP (Stan Tazuma)...
+---------------
| In article <515@cubsvax.UUCP> peters@cubsvax.UUCP (Peter S. Shenkin) writes:
| >DESCRIPTION:
| >after:	a procedure that waits until a particular running process terminates, 
| >	then initiates a new process.  This runs under csh, but should be
| >	easily translatable to bsh or ksh.
| >
| I think it's a useful tool, but there are simpler ways to do it (at
| least under a BSD Unix (which includes the Ultrix you're using)).
| Here's a program I came up with a while back.  It's called waitp.
| It has the same args. as "after".
| ------------waitp.c------------
| For AT&T Unix versions, getpgrp() doesn't behave in the above way (waitp.c).
| The AT&T ps command can be used to look at a specific process, though
| using a different ps argument than above.
+---------------

I have another method; it works everywhere except that under System V it
doesn't work to see if a process has exited and should be waited upon (this
doesn't apply to an ``after'' program anyway):

--------
#! /bin/sh
while kill -0 ${1-?}; do
	sleep ${2-60}
done
--------

The C version is just as trivial.  Note that kill -0 isn't documented in V7 or
System III... then again, V7 didn't have getpgrp() that I saw, so neither
method will work.

++Brandon
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