From: bert hubert <ahu@ds9a.nl>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
lse-tech@lists.sourceforge.net
Subject: Re: and nicer too - Re: [PATCH] epoll more scalable than poll
Date: Tue, 29 Oct 2002 01:53:32 +0100 [thread overview]
Message-ID: <20021029005332.GA32426@outpost.ds9a.nl> (raw)
In-Reply-To: <Pine.LNX.4.44.0210281652270.966-100000@blue1.dev.mcafeelabs.com>
On Mon, Oct 28, 2002 at 04:57:12PM -0800, Davide Libenzi wrote:
> > If that code dares to read immediatly from the fd without having an explicit
> > POLLIN event, which also means that epoll can only be used in this fashion
> > with nonblocking sockets.
>
> The epoll interface has to be used with non-blocking fds. The EAGAIN
Ok, so that is two things that need to be in the manpage and probably in
bold:
1) epoll only works on pipes and sockets
(not on tty, not on files)
2) epoll must be used on non-blocking sockets only
(and describe the race that happens otherwise)
If you send me the source of your manpages I'll work it in if you want.
I still vote for checking at insert time however unless that is too
expensive. Yes, we want people to read the manpages and heed them, but we
also not want to create interfaces that are needlessly errorprone.
Regards,
bert
--
http://www.PowerDNS.com Versatile DNS Software & Services
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2002-10-29 0:47 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-28 19:14 [PATCH] epoll more scalable than poll Hanna Linder
2002-10-28 20:10 ` Hanna Linder
2002-10-28 20:56 ` Martin Waitz
2002-10-28 22:02 ` bert hubert
2002-10-28 22:15 ` bert hubert
2002-10-28 22:17 ` Davide Libenzi
2002-10-28 22:08 ` bert hubert
2002-10-28 22:12 ` [Lse-tech] " Shailabh Nagar
2002-10-28 22:37 ` Davide Libenzi
2002-10-28 22:29 ` Davide Libenzi
2002-10-28 22:58 ` and nicer too - " bert hubert
2002-10-28 23:23 ` Davide Libenzi
2002-10-28 23:44 ` Jamie Lokier
2002-10-29 0:02 ` Davide Libenzi
2002-10-29 1:51 ` Jamie Lokier
2002-10-29 5:06 ` Davide Libenzi
2002-10-29 11:20 ` Jamie Lokier
2002-10-30 0:16 ` Davide Libenzi
2002-10-29 0:03 ` bert hubert
2002-10-29 0:20 ` Davide Libenzi
2002-10-29 0:48 ` Jamie Lokier
2002-10-29 1:53 ` Jamie Lokier
2002-10-28 23:45 ` and nicer too - " John Gardiner Myers
2002-10-29 0:08 ` Davide Libenzi
2002-10-29 12:59 ` Martin Waitz
2002-10-29 15:19 ` bert hubert
2002-10-29 22:54 ` Martin Waitz
2002-10-30 2:24 ` Davide Libenzi
2002-10-30 19:38 ` Martin Waitz
2002-10-31 5:04 ` Davide Libenzi
2002-10-29 0:18 ` bert hubert
2002-10-29 0:32 ` Davide Libenzi
2002-10-29 0:40 ` bert hubert
2002-10-29 0:57 ` Davide Libenzi
2002-10-29 0:53 ` bert hubert [this message]
2002-10-29 1:13 ` Davide Libenzi
2002-10-29 1:08 ` [Lse-tech] " Hanna Linder
2002-10-29 1:39 ` Davide Libenzi
2002-10-29 2:05 ` Jamie Lokier
2002-10-29 2:44 ` Davide Libenzi
2002-10-29 4:01 ` [PATCH] Updated sys_epoll now with man pages Hanna Linder
2002-10-29 5:09 ` Andrew Morton
2002-10-29 5:28 ` [Lse-tech] " Randy.Dunlap
2002-10-29 5:47 ` Davide Libenzi
2002-10-29 5:41 ` Randy.Dunlap
2002-10-29 6:12 ` Davide Libenzi
2002-10-29 6:03 ` Randy.Dunlap
2002-10-29 6:23 ` Davide Libenzi
2002-10-29 14:59 ` Paul Larson
2002-10-29 5:31 ` Davide Libenzi
2002-10-29 7:34 ` Davide Libenzi
2002-10-29 11:04 ` bert hubert
2002-10-29 15:30 ` [Lse-tech] " Shailabh Nagar
2002-10-29 17:45 ` Davide Libenzi
2002-10-29 19:30 ` Hanna Linder
2002-10-29 19:49 ` Davide Libenzi
2002-10-29 13:09 ` and nicer too - Re: [PATCH] epoll more scalable than poll bert hubert
2002-10-29 21:25 ` Davide Libenzi
2002-10-29 21:23 ` Hanna Linder
2002-10-29 21:41 ` Davide Libenzi
2002-10-29 23:06 ` Hanna Linder
2002-10-29 23:14 ` [Lse-tech] " Randy.Dunlap
2002-10-29 23:25 ` Davide Libenzi
2002-10-29 1:47 ` Security critical race condition in epoll code John Gardiner Myers
2002-10-29 2:13 ` Davide Libenzi
2002-10-29 3:38 ` Davide Libenzi
2002-10-29 19:49 ` and nicer too - Re: [PATCH] epoll more scalable than poll John Gardiner Myers
2002-10-29 21:03 ` Davide Libenzi
2002-10-30 0:26 ` Jamie Lokier
2002-10-30 2:09 ` Davide Libenzi
2002-10-30 5:51 ` Davide Libenzi
2002-10-30 2:22 ` John Gardiner Myers
2002-10-30 3:51 ` Davide Libenzi
2002-10-31 2:07 ` John Gardiner Myers
2002-10-31 3:21 ` Davide Libenzi
2002-10-31 11:10 ` [Lse-tech] " Suparna Bhattacharya
2002-10-31 18:42 ` Davide Libenzi
2002-10-30 23:01 ` Jamie Lokier
2002-10-30 23:53 ` Davide Libenzi
2002-10-31 0:52 ` Jamie Lokier
2002-10-31 4:15 ` Davide Libenzi
2002-10-31 15:07 ` Jamie Lokier
2002-10-31 19:10 ` Davide Libenzi
2002-11-01 17:42 ` Dan Kegel
2002-11-01 17:45 ` Davide Libenzi
2002-11-01 18:41 ` Dan Kegel
2002-11-01 19:16 ` Jamie Lokier
2002-11-01 20:04 ` Charlie Krasic
2002-11-01 20:14 ` Jamie Lokier
2002-11-01 20:22 ` Mark Mielke
2002-10-31 15:41 ` Unifying epoll,aio,futexes etc. (What I really want from epoll) Jamie Lokier
2002-10-31 15:48 ` bert hubert
2002-10-31 16:45 ` Alan Cox
2002-10-31 22:00 ` Rusty Russell
2002-11-01 0:32 ` Jamie Lokier
2002-11-01 13:23 ` Alan Cox
2002-10-31 20:28 ` Davide Libenzi
2002-10-31 23:02 ` Jamie Lokier
2002-11-01 1:01 ` Davide Libenzi
2002-11-01 2:01 ` Jamie Lokier
2002-11-01 17:36 ` Davide Libenzi
2002-11-01 20:45 ` Jamie Lokier
2002-11-01 1:55 ` Matthew D. Hall
2002-11-01 2:54 ` Davide Libenzi
2002-11-01 18:18 ` Dan Kegel
2002-11-01 2:56 ` Jamie Lokier
2002-11-01 4:29 ` Mark Mielke
2002-11-01 4:59 ` Jamie Lokier
2002-11-01 23:27 ` John Gardiner Myers
2002-11-02 4:55 ` Mark Mielke
2002-11-02 15:41 ` Jamie Lokier
2002-11-05 18:15 ` pipe POLLOUT oddity John Gardiner Myers
2002-11-05 18:18 ` Benjamin LaHaise
2002-11-01 23:16 ` Unifying epoll,aio,futexes etc. (What I really want from epoll) John Gardiner Myers
2002-10-30 18:59 ` and nicer too - Re: [PATCH] epoll more scalable than poll Zach Brown
2002-10-30 19:25 ` Davide Libenzi
2002-10-31 16:54 ` Davide Libenzi
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