linux-kernel - Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers for child processes

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Date:	Fri,  5 Mar 2010 11:18:16 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Lennart Poettering <lennart@...ttering.net>,
	linux-kernel@...r.kernel.org,
	Americo Wang <xiyou.wangcong@...il.com>,
	James Morris <jmorris@...ei.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Kyle McMartin <kyle@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>
Subject: Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers for 
	child processes

> Oh, no. Actually getting the SIGCHILD is the needed feature here. A
> process who sets the ANCHOR flag is surely expected to handle these
> signals. It's all about a user "init-like" process" that can do
> similar things for a logged-in user what /sbin/init can to for the
> system. So, it's all about 1.), and 3.) is a nice side-effect, but not
> the motivation to do this.

Please explain this more explicitly.  What the actual init does with
miscellaneous reparented processes is just reap them and ignore their
status.  What do you intend an "anchor" process to do other than that?


Thanks,
Roland
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