linux-kernel - question about epoll

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Message-ID: <CAFZ0FUUQgQ1FwFMEsDGYNDhW7vt1eB35-if0CUpBAvs-j-G1zA@mail.gmail.com>
Date:	Thu, 10 Nov 2011 16:35:19 +0800
From:	Robin Dong <hao.bigrat@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	davidel@...ilserver.org, Dave Jones <davej@...hat.com>,
	coly <colyli@...il.com>
Subject: question about epoll

Hi,
I am a linux user and I found some question when using epoll with EPOLLET.

My program's step:
1. create a socket (sfd) and connect to server2. create epoll (efd)3.
add socket descriptor (sfd) to epoll (efd) with flag EPOLLET4. get a
EPOLLOUT event through epoll_wait
after that, the program will nerver get a EPOLLOUT event because it
use EPOLLET mode (the same event will not be got twice)
BUT，when a message comes from server，the client socket will get a
event and this event contains EPOLLOUT and EPOLLIN, looks epoll_wait
return too much events than it should
My question is: Is this a designed mechanism or  a bug for epoll ?
Any reply will be appreciate.

-- 
--
Best Regard
Robin Dong
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