linux-kernel - Re: init's children list is long and slows reaping children.

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Message-ID: <m1veg2r7hy.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 11 Apr 2007 14:17:13 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Bill Davidsen <davidsen@....com>
Cc:	Oleg Nesterov <oleg@...sign.ru>, 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>
Subject: Re: init's children list is long and slows reaping children.

Bill Davidsen <davidsen@....com> writes:

> As long as the original parent is preserved for getppid(). There are programs
> out there which communicate between the parent and child with signals, and if
> the original parent dies, it undesirable to have the child getppid() and start
> sending signals to a program not expecting them. Invites undefined behavior.

Then the programs are broken.  getppid is defined to change if the process
is reparented to init.

Eric
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