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Re: [patch -mm 1/5] mqueue namespace : add struct mq_namespace [message #21290 is a reply to message #21289] Thu, 04 October 2007 13:12 Go to previous messageGo to previous message
Cedric Le Goater is currently offline  Cedric Le Goater
Messages: 443
Registered: February 2006
Senior Member
sukadev@us.ibm.com wrote:
> Eric W. Biederman [ebiederm@xmission.com] wrote:
> | sukadev@us.ibm.com writes:
> | 
> | > Cedric Le Goater [clg@fr.ibm.com] wrote:
> | > | > 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 ...
> | >
> | > Does the receiver need to know that sender is in a // world ? 

probably not. it would mean that the user is container aware. bad idea.
 
> | What is a // world ?
> 
> Parallel world/universe :-)
> 
> I am assuming Cedric used that to refer to a sibling pid ns.

yes :) 
 
Thanks !

C.
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