4 dnl A wrapper around AC_FUNC_GETGROUPS.
6 # Copyright (C) 1996-1997, 1999-2004, 2008-2012 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 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
18 if test "$ac_cv_func_getgroups" != yes; then
20 elif test "$ac_cv_func_getgroups_works.$ac_cv_type_getgroups" != yes.gid_t
23 AC_DEFINE([GETGROUPS_ZERO_BUG], [1], [Define this to 1 if
24 getgroups(0,NULL) does not return the number of groups.])
26 dnl Detect FreeBSD bug; POSIX requires getgroups(-1,ptr) to fail.
27 AC_CACHE_CHECK([whether getgroups handles negative values],
28 [gl_cv_func_getgroups_works],
29 [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
30 [[int size = getgroups (0, 0);
31 gid_t *list = malloc (size * sizeof *list);
32 return getgroups (-1, list) != -1;]])],
33 [gl_cv_func_getgroups_works=yes],
34 [gl_cv_func_getgroups_works=no],
36 # Guess yes on glibc systems.
37 *-gnu*) gl_cv_func_getgroups_works="guessing yes" ;;
38 # If we don't know, assume the worst.
39 *) gl_cv_func_getgroups_works="guessing no" ;;
42 case "$gl_cv_func_getgroups_works" in
44 *) REPLACE_GETGROUPS=1 ;;
47 test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS"