linux-kernel - Re: dup2() vs dup3() inconsistency when

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Date:	Fri, 10 Oct 2008 15:31:56 +0200
From:	Bernd Petrovitsch <bernd@...mix.at>
To:	mtk.manpages@...il.com
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: dup2() vs dup3() inconsistency when

On Fri, 2008-10-10 at 15:15 +0200, Michael Kerrisk wrote:
> On Fri, Oct 10, 2008 at 3:02 PM, Bernd Petrovitsch <bernd@...mix.at> wrote:
[....]
> >> but to eliminate the blemish in its design in the new dup3() (since we
> >> have alrady eliminated one other blemish).
> >
> > FWIW I consider the automatic close() in dup2() a feature (if only that
> > it avoids an additional system call).
> 
> Exploiting this "feature" can hide real errors that would be detected
> if one does an explicit close().  (See the dup2 man page.)

If someone is interested in the return value of the automatic close(),
he/she can call close() anyways and check the the result.

	Bernd
-- 
Firmix Software GmbH                   http://www.firmix.at/
mobil: +43 664 4416156                 fax: +43 1 7890849-55
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