From owner-freebsd-hackers@FreeBSD.ORG  Wed Apr 23 22:12:36 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7E5EE1065675
	for <hackers@freebsd.org>; Wed, 23 Apr 2008 22:12:36 +0000 (UTC)
	(envelope-from keramida@ceid.upatras.gr)
Received: from igloo.linux.gr (igloo.linux.gr [62.1.205.36])
	by mx1.freebsd.org (Postfix) with ESMTP id CD4688FC0A
	for <hackers@freebsd.org>; Wed, 23 Apr 2008 22:12:35 +0000 (UTC)
	(envelope-from keramida@ceid.upatras.gr)
Received: from kobe.laptop (adsl23-13.kln.forthnet.gr [77.49.150.13])
	(authenticated bits=128)
	by igloo.linux.gr (8.14.2/8.14.2/Debian-3) with ESMTP id m3NMCEAn021621
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT);
	Thu, 24 Apr 2008 01:12:24 +0300
Received: from kobe.laptop (kobe.laptop [127.0.0.1])
	by kobe.laptop (8.14.2/8.14.2) with ESMTP id m3NMCEul002340;
	Thu, 24 Apr 2008 01:12:14 +0300 (EEST)
	(envelope-from keramida@ceid.upatras.gr)
Received: (from keramida@localhost)
	by kobe.laptop (8.14.2/8.14.2/Submit) id m3NMC9eW002339;
	Thu, 24 Apr 2008 01:12:10 +0300 (EEST)
	(envelope-from keramida@ceid.upatras.gr)
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Simun Mikecin <numisemis@yahoo.com>
References: <293918.47889.qm@web36608.mail.mud.yahoo.com>
Date: Thu, 24 Apr 2008 01:12:09 +0300
In-Reply-To: <293918.47889.qm@web36608.mail.mud.yahoo.com> (Simun Mikecin's
	message of "Wed, 23 Apr 2008 09:06:44 -0700 (PDT)")
Message-ID: <87d4og9q6e.fsf@kobe.laptop>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-MailScanner-ID: m3NMCEAn021621
X-Hellug-MailScanner: Found to be clean
X-Hellug-MailScanner-SpamCheck: not spam, SpamAssassin (not cached,
	score=-3.908, required 5, autolearn=not spam, ALL_TRUSTED -1.80,
	AWL 0.49, BAYES_00 -2.60)
X-Hellug-MailScanner-From: keramida@ceid.upatras.gr
X-Spam-Status: No
Cc: hackers@freebsd.org
Subject: Re: strdup(NULL) supposed to create SIGSEGV?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 23 Apr 2008 22:12:36 -0000

On Wed, 23 Apr 2008 09:06:44 -0700 (PDT), Simun Mikecin <numisemis@yahoo.com> wrote:
>>If you're going to quote documents to support your ideas, it's probably
>>better to read them first.
>
> My apologies. My fingers were faster than my mind. But this made me
> read it the way I should have done in the first place. And I see that
> it says:
>
> "A null pointer is returned if the new string cannot be created."
>
> Does that also mean that a null pointer is returned if the input is a
> NULL pointer (cause in that case new string could not be created)?

No.  It means that if the input is *valid* but the is a problem with
completing the operation of strdup(validstring), then an error is
returned to let you know something bad is going on.