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From: ado@elsie.UUCP (Arthur David Olson)
Newsgroups: net.unix-wizards
Subject: Re: WAITing for specific process
Message-ID: <5199@elsie.UUCP>
Date: Mon, 5-Aug-85 09:51:58 EDT
Article-I.D.: elsie.5199
Posted: Mon Aug  5 09:51:58 1985
Date-Received: Wed, 7-Aug-85 00:42:53 EDT
References: <106@ihuxj.UUCP> <406@brl-tgr.ARPA>
Distribution: net
Organization: NIH-LEC, Bethesda, MD
Lines: 16
Summary: A technique to avoid

> > . . .What if you want to wait for a particular child?
> 
>   . . .#define	DELAY	2		/* test interval, in seconds */
> 
> 		while ( kill( pid, 0 ) == 0 )
> 			sleep( (unsigned)DELAY );
> 		}

Please note that this technique is not portable to 4.1bsd systems, where
attempts to use signal zero always cause kill to return a non-zero value.
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