linux-kernel - Re: [PATCH] Introduce ActivePid: in /proc/self/status (v2, was Vpid:)

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Message-ID: <1308223158.8230.66.camel@bahia.local>
Date:	Thu, 16 Jun 2011 13:19:18 +0200
From:	Greg Kurz <gkurz@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	akpm@...ux-foundation.org, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org, serge@...lyn.com,
	daniel.lezcano@...e.fr, ebiederm@...ssion.com, xemul@...nvz.org
Subject: Re: [PATCH] Introduce ActivePid: in /proc/self/status (v2, was
 Vpid:)

On Wed, 2011-06-15 at 21:03 +0200, Oleg Nesterov wrote:
> Forgot to ask,
> 
> On 06/15, Greg Kurz wrote:
> >
> > The need arises in the LXC community when one wants to send a signal from
> > the host (aka. init_pid_ns context) to a container process for which one
> > only knows the pid inside the container.
> 
> I am just curious, why do you need this?
> 

Because some LXC users run partially isolated containers (AKA.
application containers started with the lxc-execute command). Some of
the user code runs outside the container and some inside. Since
lxc-execute uses CLONE_NEWPID, it's difficult for the external code to
relate a pid generated inside the container with a task. There are
regular requests on lxc-users@ about this.

-- 
Gregory Kurz                                     gkurz@...ibm.com
Software Engineer @ IBM/Meiosys                  http://www.ibm.com
Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420

"Anarchy is about taking complete responsibility for yourself."
        Alan Moore.

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