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: <20110323170708.GA24304@redhat.com>
Date:	Wed, 23 Mar 2011 18:07:08 +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:
>
> 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...

Hmm. So I misunderstood you. And still can't understand...

Could you explain how should we change do_notify_parent_cldstop()?
I am just curious.

Oleg.

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