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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.bugs.4bsd
Subject: Re: crypt can get confused when in pipes
Message-ID: <4989@utzoo.UUCP>
Date: Tue, 29-Jan-85 19:52:02 EST
Article-I.D.: utzoo.4989
Posted: Tue Jan 29 19:52:02 1985
Date-Received: Tue, 29-Jan-85 19:52:02 EST
References: <316@daemon.UUCP>
Organization: U of Toronto Zoology
Lines: 12

>    I'm not sure why crypt inherited another process in the first place...I
>    think something else may smell a bit here, too, especially when one
>    considers the contrivance one must go through to make this bug apparent.
>    [Running crypt at the end of at least a 3-stage pipeline.]

A well-known fact of life, which some programs don't pay quite enough
attention to, is that the earlier processes in complex sh pipelines are
the children of the later ones.  Processes doing a wait() should *always*
check to make sure that the child they end up with is the right one.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry