Path: utzoo!attcan!uunet!husc6!rutgers!gatech!mcdchg!usenet
From: paul@morganucodon.cis.ohio-state.edu (Paul Placeway)
Newsgroups: comp.unix
Subject: Re: Children's exit() status
Message-ID: <10324@mcdchg.UUCP>
Date: 13 Jun 88 18:17:54 GMT
References: <4626@mcdchg.UUCP> <7967@mcdchg.UUCP> <10105@mcdchg.UUCP>
Sender: usenet@mcdchg.UUCP
Organization: The Ohio State University Dept of Computer and Information Science
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Approved: usenet@mcdchg.UUCP

In article <10105@mcdchg.UUCP> daveb@laidbak.UUCP (Dave Burton) writes:
< Actually, this is more effort than is required.
< wait(2) will return a -1 and set errno to ECHILD if there are no more
< children to wait() on. So a simple loop will work:
< 
< 	while (wait(&status) != -1 || errno != ECHILD)
< 		;	/* check status here if desired */

Ah yes, but what if you want to catch all of your exited children, you
might still have running children, and you _don't_ want to wait(2) for
them too?  Under BSD you could do that as:

	while (wait3(&status, WNOHANG, NULL) != -1 || errno != ECHILD) {
		/* stuff */
	}

But what about USG?

		--Paul