linux-kernel - Re: [path][rfc] add PR_DETACH prctl command [3/3]

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Message-ID: <20110419155830.7ad33312@lxorguk.ukuu.org.uk>
Date:	Tue, 19 Apr 2011 15:58:30 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Stas Sergeev <stsp@...et.ru>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [path][rfc] add PR_DETACH prctl command [3/3]

On Tue, 19 Apr 2011 18:54:34 +0400
Stas Sergeev <stsp@...et.ru> wrote:

> The attached patch implements the PR_DETACH prctl
> command. It detaches the entire process group from
> its parent, allowing the parent to still read the detach
> code with normal wait(). If the process then exits, the
> notification of the new parent is delayed till the old parent
> does either wait() to read the detach code, or exits.

What is the use case for this and why won't existing process group
interfaces do the job ?
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