Can two processes have the same pid?

[D'Arcy J.M. Cain]

In article <1049 at umvlsi.ecs.umass.edu> hegde at 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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