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Message-ID: <48BCF211.3050809@gmail.com>
Date: Tue, 02 Sep 2008 09:58:09 +0200
From: Michael Kerrisk <mtk.manpages@...glemail.com>
To: Ulrich Drepper <drepper@...il.com>
CC: Michael Kerrisk <mtk.manpages@...glemail.com>,
Ulrich Drepper <drepper@...hat.com>,
Davide Libenzi <davidel@...ilserver.org>,
lkml <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jakub Jelinek <jakub@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Rationale for paccept() sigset argument?
Ulrich Drepper wrote:
> On Wed, Aug 20, 2008 at 9:50 AM, Michael Kerrisk
> <mtk.manpages@...glemail.com> wrote:
>> What is the rationale for the sigset argument of paccept()?
>
> accept, like select/poll, is used often as a function to dealy
> operation. Unlike read, recv, etc, which are handled using O_NONBLOCK
> and select/poll. pselect/ppoll do not really have a sigset parameter
> to handle signals in general. You use it to enable special handling
> in case of blocking. Example: if you want to implement userlevel
> context switching, you dedicate a signal to wake up any blocked
> thread. Since accept falls more into the same category than poll,
> this means the sigset parameter is justified. In theory we could add
> it to all functions but there is no reason to do this without any
> other reason to change the interface.
Ulrich, you snipped a relevant piece of my earlier message:
[[
> * It seems to me that any case where we might want to use paccept() could be
> equivalently dealt with using the existing pselect()/ppoll()/epoll_pwait()
> followed by a conventional accept() if the listening file descriptor
> indicates as ready.
]]
So I'll rephrase: what use case does the sigset argument of paccept()
allow us to handle that couldn't equally have been handled by
pselect()/ppoll()/epoll_pwait() + traditional accept()?
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
man-pages online: http://www.kernel.org/doc/man-pages/online_pages.html
Found a bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html
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