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: <20110323165907.GE12003@htj.dyndns.org>
Date:	Wed, 23 Mar 2011 17:59:07 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
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

Hello,

On Wed, Mar 23, 2011 at 05:46:57PM +0100, Oleg Nesterov wrote:
> > 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.

They themselves are about the same but the inconsistency with the
is_real_parent() test is a bit confusing, I think.  If we're testing
for duplicates by testing ->real_parent against ->parent then the
actual delivery should be also be using ->real_parent and ->parent,
so...

Thanks.

-- 
tejun
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