linux-kernel - Re: PROBLEM: epoll_wait() returns wrong events for EOF with EPOLLOUT

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Message-ID: <Pine.LNX.4.64.0607141425391.27161@turbotaz.ourhouse>
Date:	Fri, 14 Jul 2006 14:27:47 -0500 (CDT)
From:	Chase Venters <chase.venters@...entec.com>
To:	Michael Lindner <mikell@...online.net>
cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: epoll_wait() returns wrong events for EOF with EPOLLOUT

On Fri, 14 Jul 2006, Michael Lindner wrote:

> 	Also a minor issue - epoll_ctl doesn't check if the fd in events.data.fd
> 	is the same as the fd that's been passed in as argument 3. If they differ
> 	(due to programmer error), epoll_wait will return an event with the
> 	incorrect events.data.fd specified to epoll_ctl().

This is expected behavior. events.data is a union. It is not possible or 
desireable to test data.fd in epoll_ctl() because it would break /many/ 
users of epoll who use the 32 or 64 bit unsigned field or pointer instead 
of fd.

Thanks,
Chase
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