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@node getgroups
@section @code{getgroups}
@findex getgroups
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/getgroups.html}
Gnulib module: getgroups
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw, MSVC 9.
@item
On some platforms, this function fails to reject a negative count,
even though that is less than the size that would be returned:
FreeBSD 7.2.
@item
On Ultrix 4.3, @code{getgroups (0, NULL)} always fails. See macro
@samp{AC_FUNC_GETGROUPS}.
@item
On very old systems, this function operated on an array of @samp{int},
even though that was a different size than an array of @samp{gid_t}.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
It is unspecified whether the effective group id will be included in
the returned list, nor whether the list will be sorted in any
particular order. For that matter, some platforms include the
effective group id twice, if it is also a member of the current
supplemental group ids.
@end itemize
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