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Date: Tue, 10 Jul 2007 19:41:48 +0400
From: Andrey Chernov <ache@nagual.pp.ru>
To: "Sean C. Farley" <scf@freebsd.org>
Message-ID: <20070710154148.GA22873@nagual.pp.ru>
Mail-Followup-To: Andrey Chernov <ache@nagual.pp.ru>,
	"Sean C. Farley" <scf@freebsd.org>,
	Dirk Meyer <dirk.meyer@dinoex.sub.org>, freebsd-current@freebsd.org
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Cc: Dirk Meyer <dirk.meyer@dinoex.sub.org>, freebsd-current@freebsd.org
Subject: Re: HEADS UP:  getenv() and family API change
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On Mon, Jul 09, 2007 at 03:07:42PM -0500, Sean C. Farley wrote:
> On Sun, 8 Jul 2007, Dirk Meyer wrote:
> 
>> Hallo Sean C. Farley,
>> 
>>> Changes in moving to POSIX from historic BSD API:
>>>    b. putenv takes a char * instead of const char *.
>>>    c. putenv no longer makes a copy of the input string.
>> 
>> Can you give more details?
>> 
>> An application will break in using this:
>> putenv("PATH=/bin")
>> 
>> now taking a char *, this will break with gcc42.
> 
> True.  As Andrey said, you should pass a copy of a const string into
> putenv().  putenv() is designed to allow changing a value at any time by
> manipulating the string.  This is why I really wish the Open Group would

To say strictly, copying somewhere is not neccessary since this way works 
too:

static char *s = "PATH=/bin";

putenv(s);

(don't forget static)

-- 
http://ache.pp.ru/