linux-kernel - Re: [RESEND][RFC PATCH v2] waitfd

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Date:	Sat, 10 Jan 2009 14:50:41 +0000
From:	Scott James Remnant <scott@...onical.com>
To:	Casey Dahlin <cdahlin@...hat.com>
Cc:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RESEND][RFC PATCH v2] waitfd

On Thu, 2009-01-08 at 15:36 -0500, Casey Dahlin wrote:

> Roland McGrath wrote:
> >>> Since waitfd shouldn't consume the child termination notification
> >>> waitfd should be more widely usable than the wait*() interfaces.
> > 
> > waitid can be used that way with WNOWAIT.
> 
> Yes, but waitfd does not have this flag. The reason being waitfd just
> calls waitid internally, and there is no guarantee (afaik) that
> calling waitid with WNOWAIT multiple times in succession will yield
> different results each time. This breaks the streaming behavior of the
> descriptor.
> 
This would definitely be a Nice To Have though!

Being able to use waitid() on another process of the same uid, with
WNOHANG, in a streaming fashion would be a *very* cool thing.

Scott
-- 
Scott James Remnant
scott@...onical.com

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