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Date: Wed, 20 Jul 2011 16:03:35 +0200
From: Tejun Heo <tj@kernel.org>
To: Pavel Emelyanov <xemul@parallels.com>, Nathan Lynch <ntl@pobox.com>,
        Oren Laadan <orenl@cs.columbia.edu>,
        Daniel Lezcano <dlezcano@fr.ibm.com>, Serge Hallyn <serue@us.ibm.com>,
        Cyrill Gorcunov <gorcunov@gmail.com>,
        Glauber Costa <glommer@parallels.com>, Oleg Nesterov <oleg@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc: Linux Containers <containers@lists.osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [EXAMPLE CODE] Parasite thread injection using PTRACE_SEIZE and
 friends
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On Wed, Jul 20, 2011 at 04:00:37PM +0200, Tejun Heo wrote:
> With new ptrace requests, a process can be captured and manipulated
> practically transparently.  Other than syscall retry or -EINTR failure
> in special cases and timing difference, everything including job
> control stop state stays transparent across ptrace operations.

Ooh, forgot to mention something.  The ptracer can also reliably
determine whether job control stop is in effect or not, so the whole
job control state can be captured.

Thanks.

-- 
tejun