From: Jamie Lokier <jamie@shareable.org>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Ben Mansell <ben@zeus.com>, Steven Dake <sdake@mvista.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Is POLLHUP an input-only or bidirectional condition? (was: epoll reporting events when it hasn't been asked to)
Date: Sun, 4 Apr 2004 03:08:51 +0100 [thread overview]
Message-ID: <20040404020851.GB7074@mail.shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0404031723570.2710-100000@bigblue.dev.mdolabs.com>
Davide Libenzi wrote:
> > Btw, I notice epoll never reports POLLNVAL. Is that correct?
>
> Yep, epoll does not allow you to push an invalid/unopen file descriptor
> inside the set. So you get an EBADF from epoll_ctl().
A comment in eventpoll.c says:
* This semaphore is acquired by ep_free() during the epoll file
* cleanup path and it is also acquired by eventpoll_release()
* if a file has been pushed inside an epoll set and it is then
* close()d without a previous call toepoll_ctl(EPOLL_CTL_DEL).
I.e. implying that the final close() is possible while it's registered.
(Btw, a function called eventpoll_release() doesn't exist).
What happens when a file descriptor is closed while it is inside the set?
I guess it's simply dropped from the set, is that right?
-- Jamie
next prev parent reply other threads:[~2004-04-04 2:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-01 18:25 epoll reporting events when it hasn't been asked to Ben Mansell
2004-04-01 19:28 ` Davide Libenzi
2004-04-01 23:29 ` Steven Dake
2004-04-02 9:04 ` Ben Mansell
2004-04-02 15:22 ` Davide Libenzi
2004-04-02 18:40 ` Is POLLHUP an input-only or bidirectional condition? (was: epoll reporting events when it hasn't been asked to) Jamie Lokier
2004-04-03 12:19 ` Is POLLHUP an input-only or bidirectional condition? Richard Kettlewell
2004-04-03 21:44 ` Is POLLHUP an input-only or bidirectional condition? (was: epoll reporting events when it hasn't been asked to) Davide Libenzi
2004-04-03 22:35 ` Jamie Lokier
2004-04-04 1:28 ` Davide Libenzi
2004-04-04 2:08 ` Jamie Lokier [this message]
2004-04-04 2:49 ` Davide Libenzi
2004-04-04 18:51 ` Ben Mansell
2004-04-04 19:41 ` Davide Libenzi
2004-04-04 20:24 ` Jamie Lokier
2004-04-14 17:59 ` epoll reporting events when it hasn't been asked to Dirk Morris
2004-04-14 19:39 ` Jamie Lokier
2004-04-14 20:21 ` Dirk Morris
2004-04-14 21:48 ` Jamie Lokier
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