linux-kernel - Re: RFC: A revised timerfd API

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Message-ID: <46F5128A.8050509@gmx.net>
Date:	Sat, 22 Sep 2007 15:03:06 +0200
From:	Michael Kerrisk <mtk-manpages@....net>
To:	David Härdeman <david@...deman.nu>
CC:	Thomas Gleixner <tglx@...utronix.de>, davidel@...ilserver.org,
	drepper@...hat.com, geoff@...are.org.uk,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hch@....de, corbet@....net, rdunlap@...otime.net,
	vda.linux@...glemail.com, torvalds@...ux-foundation.org,
	lee.schermerhorn@...com
Subject: Re: RFC: A revised timerfd API

David Härdeman wrote:
> On Tue, September 18, 2007 13:30, Thomas Gleixner wrote:
>>>>         timer_gettime(fd | POSIX_TIMER_FD, .....);
>> If we use the most significant bit for POSIX_TIMER_FD, we should be
>> fine.
> 
> I think alternative b) - three new syscalls, sounds better.
> 
> The only negatives so far are that it adds more syscalls and that it might
> require code duplication with posix timers. The syscall numbers argument
> seemed not to be very important and the code duplication should be fixable
> by refactoring the code so that more is shared between the two systems (I
> assume).

Yes, I'm inclined to agree with you on both points.

> Overloading file descriptors with flags looks ugly, is there any other
> syscall which does that?

AFAIK there is no other syscall that does that.  I agree that it's not very
pretty.

Cheers,

Michael

-- 
Michael Kerrisk
maintainer of Linux man pages Sections 2, 3, 4, 5, and 7

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http://www.kernel.org/pub/linux/docs/manpages/
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