FILE* to file descriptor problem on OS-X

I've had a failure of the Compress::Zlib test harness reported to me from
folk running OS-X version 10.2.3. The tests failing are the same in every
case.

Here is a cut down thumbnail of the scenario that triggers the failure.

I have a Perl function that can take a file handle as parameter. This needs
to be passed to zlib, but the zlib API expects a file descriptor, so I pass
the fileno to the XSUB, thus:

    sub gzopen
    {
        my $fh = shift ;
        xs_gzopen(fileno($fh));
    }

and then in XS-land

    xs_gzopen(int fd)
        CODE:
         gzdopen(fh) ;

Once in XSUB-land, any use of "fd" fails completely.

This feature has been working for years on all other platforms. Anyone know
if this is just a "feature" of OS-X, or is there a way to work around it?

cheers
Paul

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• FILE* to file descriptor problem on OS-X by Paul Marquess