linux-kernel - Re: [PATCH] Revised timerfd() interface

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Message-ID: <32394.1187188807@lwn.net>
Date:	Wed, 15 Aug 2007 08:40:07 -0600
From:	corbet@....net (Jonathan Corbet)
To:	Michael Kerrisk <mtk-manpages@....net>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Linux Torvalds <torvalds@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>, drepper@...hat.com,
	stable@...nel.org, Christoph Hellwig <hch@....de>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Revised timerfd() interface 

Sorry for the late commentary...as I looked this over, one thing popped
into my mind....

> b) Make the 'clockid' immutable: it can only be set
>    if 'ufd' is -1 -- that is, on the timerfd() call that
>    first creates a timer.

timerfd() is looking increasingly like a multiplexor system call in
disguise.  There is no form of invocation which uses all of the
arguments.  Are we sure we wouldn't rather have something like:

	timerfd_open(clock);
	timerfd_adjust(fd, new_time, old_time);

?

jon
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