linux-kernel - Re: [PATCH] Only send pdeath_signal when getppid changes.

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Message-Id: <20070410174852.88661D82F8@pipsqueak.sf.frob.com>
Date:	Tue, 10 Apr 2007 10:48:51 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Robin Holt <holt@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org,
	Jack Steiner <steiner@...ricas.sgi.com>, acahalan@...il.com
Subject: Re: [PATCH] Only send pdeath_signal when getppid changes.

> Does a parent death signal make most sense between separately written programs?

I don't think it does.  It has always seemed an utterly cockamamy feature
to me, and I've never understood what actually motivated it.

> Does a parent death signal make most sense between processes that are part of
> a larger program.

That is the only way I can really see it being used.  The only actual
example of use I know is what Albert Cahalan reported.  To my mind, the
only semantics that matter for pdeath_signal are what previous uses
expected in the past and still need for compatibility.  If we started with
a fresh rationale from the ground up on what the feature is good for, I am
rather skeptical it would pass muster to be added today.

Thanks,
Roland
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