[issue7900] posix.getgroups() failure on Mac OS X

[Alexander Belopolsky]

Alexander Belopolsky <alexander.belopolsky at gmail.com> added the comment:

It looks like the current implementation is not POSIX compliant because it assumes that NGROUPS_MAX is compile time constant.  However, according to <http://www.opengroup.org/onlinepubs/000095399/functions/getgroups.html>, "Application writers should note that {NGROUPS_MAX} is not necessarily a constant on all implementations."

I would suggest using my _DARWIN_C_SOURCE implementation unconditionally and make similar changes to posix_setgroups, but this is probably a subject for a separate issue.

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<http://bugs.python.org/issue7900>
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