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Date: Wed, 20 Jul 2011 09:21:29 -0500
From: Serge Hallyn <serge.hallyn@canonical.com>
To: Tejun Heo <tj@kernel.org>
Cc: Pavel Emelyanov <xemul@parallels.com>, Nathan Lynch <ntl@pobox.com>,
        Oren Laadan <orenl@cs.columbia.edu>,
        Daniel Lezcano <dlezcano@fr.ibm.com>, Serge Hallyn <serge@hallyn.com>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Linux Containers <containers@lists.osdl.org>,
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Subject: Re: [EXAMPLE CODE] Parasite thread injection using PTRACE_SEIZE and
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Message-ID: <20110720142129.GB19603@peqn>
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Quoting Tejun Heo (tj@kernel.org):
> 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.

It sounds cool, thanks.  Is this completely separate from Pavel's
CR patchset (which I've not yet gotten around to looking at in
detail)?

-serge