Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!vsi1!wyse!mips!prls!philabs!phri!marob!cowan
From: cowan@marob.masa.com (John Cowan)
Newsgroups: comp.unix.questions
Subject: Re: How to tell if a process is active?
Keywords: process
Message-ID: <1989Jun16.182054.746@marob.masa.com>
Date: 16 Jun 89 18:20:54 GMT
References: <2727@infocenter.UUCP> <4608@ncrcae.Columbia.NCR.COM>
Reply-To: cowan@marob.masa.com (John Cowan)
Organization: ESCC  New York City
Lines: 45

In article <4608@ncrcae.Columbia.NCR.COM> wescott@ncrcae.Columbia.NCR.COM (Mike Wescott) writes:
>In article <2727@infocenter.UUCP> mhoffman@infocenter.UUCP (Mike Hoffman) writes:
>> 
>> I have an application in which I need to check to see if a process
>> is currently active. 
>
>Try:
>
>isactive(pid)
>	if(kill(pid,0)==0 || errno == EPERM)
>		return(process is active)
>	else 
>		return(process is not active)
>
>see kill(2).
>
>-- 
>	-Mike Wescott
>	 mike.wescott@ncrcae.Columbia.NCR.COM


That doesn't work on all flavors of Unix.  Xenix supports it, so does
SVR2, but definitely not in V7.  I don't know about BSD.

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