From: Ulrich Drepper <drepper@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: mtk.manpages@gmail.com, Al Viro <viro@zeniv.linux.org.uk>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: dup2() vs dup3() inconsistency when
Date: Thu, 09 Oct 2008 13:52:50 -0700 [thread overview]
Message-ID: <48EE6F22.5070306@redhat.com> (raw)
In-Reply-To: <48EE6CD6.10007@zytor.com>
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H. Peter Anvin wrote:
> The result of dup3(fd, fd, O_CLOEXEC) is to set the O_CLOEXEC flag on fd.
That's bad and disregarded by Al and myself because it is one and the
same descriptor and therefore it changes the source descriptor.
> Step (2) could be considered a bit dubious, but the behaviour of
> dup2(fd, fd) is a direct consequence of the chosen semantics.
The behavior of dup2(fd,fd) is just a result of an accident in the
original implementation. It makes no sense and the mistake doesn't have
to be repeated.
- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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next prev parent reply other threads:[~2008-10-09 20:53 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-09 12:10 dup2() vs dup3() inconsistency when Michael Kerrisk
2008-10-09 17:21 ` H. Peter Anvin
2008-10-09 20:31 ` Ulrich Drepper
2008-10-09 20:43 ` H. Peter Anvin
2008-10-09 20:52 ` Ulrich Drepper [this message]
2008-10-09 20:57 ` H. Peter Anvin
2008-10-09 21:04 ` Ulrich Drepper
2008-10-10 5:04 ` Michael Kerrisk
2008-10-10 12:09 ` Bernd Petrovitsch
2008-10-10 12:15 ` Michael Kerrisk
2008-10-10 13:02 ` Bernd Petrovitsch
2008-10-10 13:15 ` Michael Kerrisk
2008-10-10 13:31 ` Bernd Petrovitsch
2008-10-10 5:01 ` Michael Kerrisk
2008-10-10 13:43 ` Heikki Orsila
[not found] <bl2EV-7G2-9@gated-at.bofh.it>
[not found] ` <bl7v3-5sk-17@gated-at.bofh.it>
[not found] ` <blasN-OS-9@gated-at.bofh.it>
[not found] ` <blaCu-Z0-11@gated-at.bofh.it>
[not found] ` <blaMj-18o-23@gated-at.bofh.it>
[not found] ` <blaMj-18o-21@gated-at.bofh.it>
[not found] ` <bliqg-2DH-1@gated-at.bofh.it>
2008-10-10 11:42 ` Bodo Eggert
2008-10-10 11:59 ` Michael Kerrisk
2008-10-10 13:19 ` Bodo Eggert
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