From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cedric Le Goater <clg-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Subject: Re: [patch -mm 1/5] mqueue namespace : add struct mq_namespace
Date: Wed, 03 Oct 2007 16:11:27 +0200
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To: "Serge E. Hallyn" <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: "Denis V. Lunev" <den-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
List-Id: containers.vger.kernel.org

> I think you and Eric (and I) are disagreeing about those limitations.
> You take it for granted that a sibling pidns is off limits for signals.
> But the signal wasn't sent using a pid, but using a file (in SIGIO
> case).  So since the fs was shared, the signal should be sent.  An
> event happened, and the receiver wants to know about it.

seen that way I agree. 

si_code is set to SI_MESGQ, but what do we put in si_pid ? 0 ?

we could use the si_errno to pass extra info, like the sending process 
lives in a // world ...

C.