From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [Xenomai-help] kernel oops using mq_open after fork
From: Philippe Gerum <rpm@xenomai.org>
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Date: Wed, 19 Jul 2006 14:10:57 +0200
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org, "Landau, Bracha" <BLandau@domain.hid>

On Wed, 2006-07-19 at 13:51 +0200, Gilles Chanteperdrix wrote:
> Landau, Bracha wrote:
>  > I'm using xenomai 2.2 rc3 on a MPC8247, on linux 2.6.14.
>  >  
>  > I have a problem using mq_open. Please see the attached code.
>  > If I fork before the mq_open the kernel, I get a kernel oops.
>  > 
>  > Why this behaviour?
> 
> The child process has not "bound" the interface, so, it has no
> per-process data. If this is the cause of the oops, the solution is to
> add a pthread_atfork call in xeno_user_skin_init in order for the
> process children to also call xeno_user_skin_init.

Additionally, don't fiddle with SIGCHLD: we use it internally.

> 
-- 
Philippe.