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Date: Fri, 5 Oct 2001 11:06:06 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: getcwd() problem
Message-ID: <20011005110606.H13996@redhat.com>
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References: <200110051213 DOT VAA12158 AT mail DOT raidway DOT ne DOT jp> <17911642410 DOT 20011005162352 AT logos-m DOT ru>
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On Fri, Oct 05, 2001 at 04:23:52PM +0400, egor duda wrote:
>Hi!
>
>Friday, 05 October, 2001 Yasushi Higuchi yzone AT mail DOT raidway DOT ne DOT jp wrote:
>
>YH> I found a problem in the getcwd() function in recent snapshot.
>
>[...]
>>>    char *cwd = getcwd(NULL, 256);
>[...]
>
>Single Unix Specification v2 says that "If buf is a null pointer, the
>behaviour of getcwd() is undefined."
>
>YH> Reference: FreeBSD manpages
>>>STANDARDS
>>>The getcwd() function conforms to ISO 9899: 1990 (``ISO C''). The ability
>>>to specify a NULL pointer and have getcwd() allocate memory as necessary
>>>is an extension.
>
>cygwin doesn't support this extension. it's arguable whether it should
>be added or not. code that implicitly allocates (on doesn't allocate,
>depending in parameters) memory on heap is a source of potential
>memory leaks.

It's supposed to support it, though.  There is code to handle this but
recent pointer validation checks were a little too aggressive for the
getcwd case.

I've checked in a fix for this.

cgf

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