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From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: epoll vs stdin/stdout
Date: 7 Jul 2003 14:20:09 -0700	[thread overview]
Message-ID: <beco69$rfr$1@cesium.transmeta.com> (raw)
In-Reply-To: <beckj5$e2a$1@news.cistron.nl>

Followup to:  <beckj5$e2a$1@news.cistron.nl>
By author:    "Miquel van Smoorenburg" <miquels@cistron.nl>
In newsgroup: linux.dev.kernel
>
> In article <20030707200315.GA10939@mail.jlokier.co.uk>,
> Jamie Lokier  <jamie@shareable.org> wrote:
> >Unfortunately I cannot think of a way for a process to know, in
> >general, whether two fds that it is passed correspond to the same file
> >*.  Well, apart from trying epoll on it and seeing what happens :/
> 
> fstat() and compare st_dev and st_ino
> 

That doesn't show if they share the same file *.  Two fd's can be open
to the same file or other object without sharing the same file *.

Seriously, this is not something userspace should have to worry
about.  The interface should handle it, otherwise it's broken.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64

  reply	other threads:[~2003-07-07 21:05 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-07 15:48 Eric Varsanyi
2003-07-07 18:57 ` Davide Libenzi
2003-07-07 19:47   ` Eric Varsanyi
2003-07-07 20:03     ` Jamie Lokier
2003-07-07 20:18       ` Miquel van Smoorenburg
2003-07-07 21:20         ` H. Peter Anvin [this message]
2003-07-07 22:11       ` Davide Libenzi
2003-07-08  0:24         ` Jamie Lokier
2003-07-08  0:23           ` Davide Libenzi
2003-07-07 22:12     ` Davide Libenzi
2003-07-07 23:26       ` Davide Libenzi
2003-07-08  0:32         ` Jamie Lokier
2003-07-08  0:32           ` Davide Libenzi
2003-07-08  0:52             ` Jamie Lokier
2003-07-08  1:13               ` Davide Libenzi
2003-07-08 12:34                 ` Jamie Lokier
2003-07-08 13:51                   ` Jamie Lokier
2003-07-08 15:20                     ` Davide Libenzi
2003-07-08 15:46         ` Eric Varsanyi
2003-07-08 15:42           ` Davide Libenzi
2003-07-08 16:02             ` Eric Varsanyi
2003-07-08 17:06               ` Davide Libenzi
2003-07-08 18:40                 ` Eric Varsanyi

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