linux-kernel - Re: [PATCH 10/10] ptrace: implement group stop notification for ptracer

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Date:	Fri, 20 May 2011 10:46:41 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	jan.kratochvil@...hat.com, vda.linux@...glemail.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com
Subject: Re: [PATCH 10/10] ptrace: implement group stop notification for
 ptracer

Hello, Oleg.

On Thu, May 19, 2011 at 07:13:27PM +0200, Oleg Nesterov wrote:
> OK. I still hope we can avoid this somehow. May be play with exit_code
> so that do_wait() can succeed even if the JOBCTL_TRAPPING tracee is
> running. Perhaps.

I considered that but re-trapping seemed cleaner to me.  wait(2)
already depends on retries so I don't think adding TRAPPING wait
introduces too much extra complexity.  That said, if you can come up
with something simpler, by all means.

> If only we could notify the tracer from ptrace_trap_notify... IIUC,
> this is the only problem? I mean, apart from this there is no need
> to wake up the tracee.

Yeap, correct.
ahead.

Thanks.

-- 
tejun
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