From: Davide Libenzi <davidel@xmailserver.org>
To: Eric Varsanyi <e0216@foo21.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: epoll vs stdin/stdout
Date: Mon, 7 Jul 2003 11:57:02 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.55.0307071153270.4704@bigblue.dev.mcafeelabs.com> (raw)
In-Reply-To: <20030707154823.GA8696@srv.foo21.com>
On Mon, 7 Jul 2003, Eric Varsanyi wrote:
> It seems reasonable to register for read events on stdin and write events
> on stdout. In an earlier posting on the epoll API it was asserted that
> anyone registering for events on 2 fd's that shared the same file * was
> asking for trouble.
>
> I can imagine many apps that might want to proxy async traffic thru
> stdin/stdout, what is the intended general solution for this with epoll?
>
> FWIW in my app I'm just assuming that fd0 is a dup of fd1 if EPOLL_CTL_ADD
> on fd1 fails with EEXISTS, then I EPOLL_CTL_MOD on fd0 to add the write event.
> This seems like a bit of a hack tho.
Events caught by epoll comes from a file* since that is the abstraction
the kernel handles. Events really happen on the file* and there's no way
if you dup()ing 1000 times a single fd, to say that events are for fd = 122.
- Davide
next prev parent reply other threads:[~2003-07-07 18:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-07 15:48 epoll vs stdin/stdout Eric Varsanyi
2003-07-07 18:57 ` Davide Libenzi [this message]
2003-07-07 19:47 ` Eric Varsanyi
2003-07-07 20:03 ` Jamie Lokier
2003-07-07 20:18 ` Miquel van Smoorenburg
2003-07-07 21:20 ` H. Peter Anvin
2003-07-07 22:11 ` Davide Libenzi
2003-07-08 0:24 ` Jamie Lokier
2003-07-08 0:23 ` Davide Libenzi
2003-07-07 22:12 ` Davide Libenzi
2003-07-07 23:26 ` Davide Libenzi
2003-07-08 0:32 ` Jamie Lokier
2003-07-08 0:32 ` Davide Libenzi
2003-07-08 0:52 ` Jamie Lokier
2003-07-08 1:13 ` Davide Libenzi
2003-07-08 12:34 ` Jamie Lokier
2003-07-08 13:51 ` Jamie Lokier
2003-07-08 15:20 ` Davide Libenzi
2003-07-08 15:46 ` Eric Varsanyi
2003-07-08 15:42 ` Davide Libenzi
2003-07-08 16:02 ` Eric Varsanyi
2003-07-08 17:06 ` Davide Libenzi
2003-07-08 18:40 ` Eric Varsanyi
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