linux-kernel - Re: [RFC][PATCH] Notify init when processes are reparented to it

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Message-ID: <20081229132305.GA31210@redhat.com>
Date:	Mon, 29 Dec 2008 14:23:05 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Scott James Remnant <scott@...onical.com>
Cc:	Roland McGrath <roland@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] Notify init when processes are reparented to it

On 12/29, Scott James Remnant wrote:
>
> On Sun, 2008-12-28 at 14:01 -0800, Roland McGrath wrote:
>
> > I'm highly skeptical that this is a desireable feature at all, and
> > certainly I find the abuse of siginfo_t.si_status here extremely
> > questionable.  I think we need a clear explanation of what problems
> > the feature is intended to address.
> >
> Did the original e-mail not address this?

Do you mean

	[RFC] Notify init when processes are reparented to it
	http://marc.info/?l=linux-kernel&m=123038049428388

?

I am not sure I really understand the problem. And thus I can't
understand how this patch can help.

OK,

> We want to be able to supervise daemons.

What do you mean?

> Later on, 1002 will die and init will receive SIGCHLD for it.
>
> Unfortunately neither the 1001 or 1002 processes are known to init, even
> though they are original children of the process it spawned (1000), for
> init to be notified about them - this has been forgotten.

Ok, with this patch /sbin/init knows that 1002 is a descendant
of apache(1000) which was spwaned by init. What can init do
with this info?

To clarify, I am not arguing, I am just trying to understand.

Oleg.

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