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

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Message-ID: <87fxjw46ey.fsf@basil.nowhere.org>
Date:	Tue, 06 Jan 2009 19:48:37 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Casey Dahlin <cdahlin@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2] waitfd

Casey Dahlin <cdahlin@...hat.com> writes:

> Linux now exposes signals, timers, and events via file descriptors
> through signalfd, timerfd, and eventfd. This means programmers can use
> a single select/[e]poll call to monitor all change in their
> program. This patch aims to expose child death via the same mechanism.
>
> waitfd provides a file descriptor out of which may be read a series of
> siginfo_t objects describing child death. A child process is reaped as
> soon as its information is read. This means child monitoring too can
> be performed with that same poll call.
>
> Patch is against v2.6.28

Can you please provide a manpage with the exact proposed semantics of
the interface.

Without that it's very hard to evaluate if the interface makes sense
or not.

In general a single paragraph is not enough to justify a new system 
call.

-Andi

-- 
ak@...ux.intel.com
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