linux-kernel - Re: [PATCH] EPOLL_CTL_SET operatin for epoll

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Message-ID: <alpine.DEB.2.00.0909241641100.1164@makko.or.mcafeemobile.com>
Date:	Thu, 24 Sep 2009 16:46:20 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Carlo Marcelo Arenas Belon <carenas@...inet.com.pe>
cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] EPOLL_CTL_SET operatin for epoll_ctl when using
 EPOLLONESHOT

On Thu, 24 Sep 2009, Carlo Marcelo Arenas Belon wrote:

> Simplify userspace by eliminating the need to track whether a specific
> filehandle was added to epoll already and only needs to be re-arm
> after being internally disabled by EPOLLONESHOT.
> 
> EPOLL_CLT_SET can be used to add or modify a filehandle in epoll
> using the kernel's internal tracking to apply the right equivalent
> operation to EPOLL_CTL_ADD or EPOLL_CTL_MOD.

Applications (except poorly written ones) usually know what's in the 
epoll set and what's not, in their bookkeeping.
I'm sorry, but I see no use of this code.



- Davide


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