linux-kernel - Re: epoll and shared fd's

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Message-ID: <Pine.LNX.4.64.0802281128210.7660@alien.or.mcafeemobile.com>
Date:	Thu, 28 Feb 2008 11:30:18 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Bodo Eggert <7eggert@....de>
cc:	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Pierre Habouzit <madcoder@...ian.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Marc Lehmann <schmorp@...morp.de>,
	David Schwartz <davids@...master.com>
Subject: Re: epoll and shared fd's

On Thu, 28 Feb 2008, Bodo Eggert wrote:

> On Thu, 28 Feb 2008, Michael Kerrisk wrote:
> 
> > On Tue, Feb 26, 2008 at 7:16 PM, Bodo Eggert <7eggert@....de> wrote:
> > > Michael Kerrisk <mtk.manpages@...glemail.com> wrote:
> > >
> > >  > b) It seems to me that you text doesn't quite make the point explicit
> > >  > enough.  I've tried to rewrite it; could you please check:
> > >  >
> > >  >        A6     Yes, but be aware of the following point.  A  file
> > >  >               descriptor is a reference to an open file descrip-
> > >  >               tion (see  open(2)).   Whenever  a  descriptor  is
> > >  >               duplicated  via dup(2), dup2(2), fcntl(2) F_DUPFD,
> [.........]
> 
> > >  > Does that seem okay?  I plan to include the text in man-pages-2.79.
> > >
> > >  It's hard to read for me, and probably very hard to read for others.
> > 
> > Bodo,
> > 
> > I'm just reviewing this text, trying to see if I can improve it.  At
> > the moment, I'm a little stuck.  can you say a little more about why
> > you find it hard to read?  that may help me improve it.
> 
> I think it's enough to mention that the last copy of the file descriptor 
> (e.g. by dup or fork) must be closed *or* the file must be explicitely 
> unregistered (As far as I understand by now).

Exactly!
Michael, I noticed that there's a reference to it in Q6. We better clarify 
that one.



- Davide


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