4 dnl A wrapper around AC_FUNC_GETGROUPS.
6 # Copyright (C) 1996-1997, 1999-2004, 2008-2011 Free Software Foundation, Inc.
8 # This file is free software; the Free Software Foundation
9 # gives unlimited permission to copy and/or distribute it,
10 # with or without modifications, as long as this notice is preserved.
12 AC_DEFUN([gl_FUNC_GETGROUPS],
14 AC_REQUIRE([AC_FUNC_GETGROUPS])
15 AC_REQUIRE([AC_TYPE_GETGROUPS])
16 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
17 if test "$ac_cv_func_getgroups" != yes; then
19 elif test "$ac_cv_func_getgroups_works.$ac_cv_type_getgroups" != yes.gid_t
22 AC_DEFINE([GETGROUPS_ZERO_BUG], [1], [Define this to 1 if
23 getgroups(0,NULL) does not return the number of groups.])
25 dnl Detect FreeBSD bug; POSIX requires getgroups(-1,ptr) to fail.
26 AC_CACHE_CHECK([whether getgroups handles negative values],
27 [gl_cv_func_getgroups_works],
28 [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
29 [[int size = getgroups (0, 0);
30 gid_t *list = malloc (size * sizeof *list);
31 return getgroups (-1, list) != -1;]])],
32 [gl_cv_func_getgroups_works=yes],
33 [gl_cv_func_getgroups_works=no],
34 [gl_cv_func_getgroups_works="guessing no"])])
35 if test "$gl_cv_func_getgroups_works" != yes; then
39 test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS"