linux-kernel - Re: [PATCH 7/8] job control: Notify the real parent of job control events regardless of ptrace

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Message-ID: <20110323164657.GB22527@redhat.com>
Date:	Wed, 23 Mar 2011 17:46:57 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	roland@...hat.com, jan.kratochvil@...hat.com,
	vda.linux@...glemail.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	indan@....nu
Subject: Re: [PATCH 7/8] job control: Notify the real parent of job control
	events regardless of ptrace

On 03/23, Tejun Heo wrote:
>
> On Wed, Mar 23, 2011 at 10:17:36AM +0100, Tejun Heo wrote:
> > >
> > > child->real_parent must be equal to child->group_leader->real_parent.
> >
> > Okay.
>
> Ooh, on a related note, we probably want to change
> do_notify_parent_cldstop() too.  tsk->group_leader->real_parent is
> used as the delivery target when !@..._ptracer.  This is the same with
> tsk->real_parent and the code has been like this for a long time but
> is a bit confusing.

Yes, although in this case we do

		tsk = tsk->group_leader;
		parent = tsk->real_parent;

We need to change tsk to report the correct si_pid. But we could do

		parent = tsk->real_parent;
		tsk = tsk->group_leader;

not sure this looks less confusing.

Oleg.

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