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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.LSU.0.999.0802281942420.2968@be1.lrz>
Date:	Thu, 28 Feb 2008 20:17:07 +0100 (CET)
From:	Bodo Eggert <7eggert@....de>
To:	Michael Kerrisk <mtk.manpages@...glemail.com>
cc:	7eggert@....de, Davide Libenzi <davidel@...ilserver.org>,
	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, 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).
-- 
"Aim towards the Enemy."
-Instruction printed on US Rocket Launcher
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/