From owner-freebsd-current@FreeBSD.ORG  Thu Dec  2 10:55:07 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 1F05316A4CE; Thu,  2 Dec 2004 10:55:07 +0000 (GMT)
Received: from shuttle.wide.toshiba.co.jp (shuttle.wide.toshiba.co.jp
	[202.249.10.124])	by mx1.FreeBSD.org (Postfix) with ESMTP
	id BCD0143D39; Thu,  2 Dec 2004 10:55:06 +0000 (GMT)
	(envelope-from jinmei@isl.rdc.toshiba.co.jp)
Received: from ocean.jinmei.org (unknown [2001:200:0:8002:200:39ff:fed7:e2e4])
	by shuttle.wide.toshiba.co.jp (Postfix) with ESMTP
	id AE6AE15210; Thu,  2 Dec 2004 19:55:05 +0900 (JST)
Date: Thu, 02 Dec 2004 19:55:15 +0900
Message-ID: <y7vllchnf58.wl@ocean.jinmei.org>
From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?=
	<jinmei@isl.rdc.toshiba.co.jp>
To: Andre Oppermann <andre@freebsd.org>
In-Reply-To: <41AEF204.2070402@freebsd.org>
References: <y7vfz2qpltw.wl@ocean.jinmei.org>
	 <MDEHLPKNGKAHNMBLJOLKMEAKADAB.davids@webmaster.com>
	 <y7v1xe9p87u.wl@ocean.jinmei.org>
	 <41AEF204.2070402@freebsd.org>
User-Agent: Wanderlust/2.10.1 (Watching The Wheels) Emacs/21.3 Mule/5.0
	(SAKAKI)
Organization: Research & Development Center, Toshiba Corp., Kawasaki, Japan.
MIME-Version: 1.0 (generated by SEMI 1.14.5 - "Awara-Onsen")
Content-Type: text/plain; charset=US-ASCII
cc: current@FreeBSD.org
Subject: Re: malloc(0) returns an invalid address
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 02 Dec 2004 10:55:07 -0000

>>>>> On Thu, 02 Dec 2004 11:44:20 +0100, 
>>>>> Andre Oppermann <andre@freebsd.org> said:

>> I expected the answer:-)  This is probably a matter of the definition
>> of "validness", and I won't argue about this point.  (and, of course,
>> it cannot be justified to dereference a zero-length pointer, whether
>> the result is segfault or not)
>> 
>> BTW: the "same problem" (of segfault) does actually NOT occur with
>> malloc(1) and int * on FreeBSD 5.3 (i386).  I suspect malloc(3) takes
>> a special action with the size of zero.

> man malloc(3) and look for options 'V' and 'X'.

I've already done this, and, sorry, this is irrelevant to this problem.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp