linux-kernel - Re: [PATCH] eventfd, signalfd, timerfd, epoll

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Date:	Sun, 27 Apr 2008 16:20:30 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ulrich Drepper <drepper@...hat.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] eventfd, signalfd, timerfd, epoll_create w/flags

On Sun, 27 Apr 2008, Ulrich Drepper wrote:

> In the absence of sys_indirect we need the following patches as well.  These
> are all the event handling functions: epoll_create, signalfd, timerfd, eventd.
> 
> There is good news and bad.  The good news is that the timerfd interface
> already has a flags parameter.  We just have to put it to use.  It's IMO
> not a good idea to use the O_* values for any of the flag parameters so I
> introduced new macros for all the functions.
> 
> For signalfd and eventfd no flags parameter is available in the syscall.
> But for the userlevel interfaces I have added such a parameter back when.
> They are just required to be zero so far.  This means the new syscalls
> will completely transparently be used once glibc knows about them.
> Programs can start using the new flags and get told when the implementation
> doesn't support it.
> 
> The bad case is epoll_create.  Neither the kernel nor the userlevel interface
> has a flags parameter.  So we need a new, additional interface.  We could have
> one which differs from epoll_create only in that it returns a file descriptor
> with close-on-exec already set.  I don't like that.  Instead, the patch adds
> a new interface with a flags parameter.  More flexibility in future.

Ok, I asked this myself for about ten minutes, than I gave up. But why 
sys_epoll_createp() instead of sys_epoll_create2()? There MUST be a reason 
to deviate from the standard of all the other ones...
The one between sys_indirect and syscall explosion is the battle of the 
ugly.
Besides that, patches look fine to me (though w/out a very good reason, I 
prefer sys_epoll_create2() instead of sys_epoll_createp()).



- Davide


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