From owner-freebsd-stable@FreeBSD.ORG Sun Apr 6 21:52:37 2008 Return-Path: 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 3E17B106566B for ; Sun, 6 Apr 2008 21:52:37 +0000 (UTC) (envelope-from jdc@parodius.com) Received: from mx01.sc1.parodius.com (mx01.sc1.parodius.com [72.20.106.3]) by mx1.freebsd.org (Postfix) with ESMTP id 246018FC25 for ; Sun, 6 Apr 2008 21:52:37 +0000 (UTC) (envelope-from jdc@parodius.com) Received: by mx01.sc1.parodius.com (Postfix, from userid 1000) id 10FE01CC05B; Sun, 6 Apr 2008 14:52:37 -0700 (PDT) Date: Sun, 6 Apr 2008 14:52:37 -0700 From: Jeremy Chadwick To: Doug Hardie Message-ID: <20080406215237.GA72336@eos.sc1.parodius.com> References: <1794897B-7A36-412A-8849-87F10268EBAE@lafn.org> <20080406214524.GA72199@eos.sc1.parodius.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080406214524.GA72199@eos.sc1.parodius.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: FreeBSD Stable Subject: Re: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Apr 2008 21:52:37 -0000 On Sun, Apr 06, 2008 at 02:45:24PM -0700, Jeremy Chadwick wrote: > On Sun, Apr 06, 2008 at 02:37:06PM -0700, Doug Hardie wrote: > > 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? > > I'd begin peeking here: > > http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/stdlib/getenv.c Follow-up: the manpages between 6.3-PRERELEASE and 7.0-STABLE do document said change: http://www.freebsd.org/cgi/man.cgi?query=getenv&apropos=0&sektion=3&manpath=FreeBSD+6.3-RELEASE&format=html http://www.freebsd.org/cgi/man.cgi?query=getenv&apropos=0&sektion=3&manpath=FreeBSD+7.0-stable&format=html -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |