Path: utzoo!attcan!telly!druid!darcy
From: darcy@druid.uucp (D'Arcy J.M. Cain)
Newsgroups: comp.unix.wizards
Subject: Re: Can two processes have the same pid?
Summary: Ultrix allows 2 processes with same PID
Keywords: duplicate pid, inherited process.
Message-ID: <1990Jun10.185853.15235@druid.uucp>
Date: 10 Jun 90 18:58:53 GMT
References: <1049@umvlsi.ecs.umass.edu>
Reply-To: darcy@druid.UUCP (D'Arcy J.M. Cain)
Organization: D'Arcy Cain Consulting, West Hill, Ontario
Lines: 18

In article <1049@umvlsi.ecs.umass.edu> hegde@umvlsi.ecs.umass.edu
(Uday Hegde) writes:
> [...]
>Doing a "ps" revealed that there was one other process, belonging to
>some other user, which had pid 29973 and my process was still around!
> [...]
>Is this behavior common among UNIX-like systems or is it a bug in ULTRIX?

I don't know about ULTRIX but I am sure that if that happens it is a serious
bug.  The only kernel source I have access to is Minix and that looks at
each active PID in the system before assigning a new one to make sure that
there is no duplication.

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D'Arcy J.M. Cain (darcy@druid)     |   Government:
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