Re: [Valgrind-users] posix_memalign on Mac results in an apparent leak

[Patrick J. L. <lop...@gm...>]

On Thu, Jul 26, 2012 at 11:12 AM, Sean McBride <se...@ro...> wrote:
>
> I think it's definitely worth a bug report.  If nothing else, the man page should discuss whether a zero size is undefined behaviour or not.

The POSIX spec makes it pretty clear that this is not undefined behavior:

http://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_memalign.html

"If the size of the space requested is 0, the behavior is
implementation-defined; the value returned in memptr shall be either a
null pointer or a unique pointer."

and

"The free() function shall deallocate memory that has previously been
allocated by posix_memalign()."

Geoffrey is right; this is unambiguously a bug in Apple's C library.

Nice catch.

 - Pat