From owner-freebsd-stable@FreeBSD.ORG  Sun Apr  6 21:37:08 2008
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id D2696106564A
	for <freebsd-stable@freebsd.org>; Sun,  6 Apr 2008 21:37:08 +0000 (UTC)
	(envelope-from bc979@lafn.org)
Received: from zoot.lafn.org (zoot.lafn.ORG [206.117.18.6])
	by mx1.freebsd.org (Postfix) with ESMTP id 931568FC19
	for <freebsd-stable@freebsd.org>; Sun,  6 Apr 2008 21:37:08 +0000 (UTC)
	(envelope-from bc979@lafn.org)
Received: from [10.0.1.2] (pool-71-109-162-173.lsanca.dsl-w.verizon.net
	[71.109.162.173]) (authenticated bits=0)
	by zoot.lafn.org (8.13.6/8.13.4) with ESMTP id m36Lb6uv055305
	(version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO)
	for <freebsd-stable@freebsd.org>; Sun, 6 Apr 2008 14:37:07 -0700 (PDT)
	(envelope-from bc979@lafn.org)
Message-Id: <1794897B-7A36-412A-8849-87F10268EBAE@lafn.org>
From: Doug Hardie <bc979@lafn.org>
To: FreeBSD Stable <freebsd-stable@freebsd.org>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v919.2)
Date: Sun, 6 Apr 2008 14:37:06 -0700
X-Mailer: Apple Mail (2.919.2)
X-Virus-Scanned: ClamAV 0.88.7/6635/Sun Apr  6 09:29:31 2008 on zoot.lafn.org
X-Virus-Status: Clean
Subject: getenv in FreeBSD 7
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 06 Apr 2008 21:37:08 -0000

Somewhere between FreeBSD 6.2 and 7.0 getenv has been changed to  
return a null if an environment variable is set but has no value.  I  
don't find anything anywhere in the documentation/man pages on this.   
As a result, you cannot distinguish between a variable that is not set  
and one that is set to a value of "".  Is this a bug or a feature  
change?