-#serial 6
+# serial 15
dnl From Jim Meyering.
-dnl
-dnl Invoking code should check $GETGROUPS_LIB something like this:
-dnl jm_FUNC_GETGROUPS
-dnl test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS"
-dnl
+dnl A wrapper around AC_FUNC_GETGROUPS.
-AC_DEFUN([jm_FUNC_GETGROUPS],
-[
- AC_REQUIRE([AC_FUNC_GETGROUPS])
- AC_SUBST([GETGROUPS_LIB])
- if test $ac_cv_func_getgroups_works = no; then
- AC_LIBOBJ(getgroups)
- AC_DEFINE(getgroups, rpl_getgroups,
- [Define as rpl_getgroups if getgroups doesn't work right.])
- gl_PREREQ_GETGROUPS
- fi
-])
+# Copyright (C) 1996-1997, 1999-2004, 2008-2010 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
-# Prerequisites of lib/getgroups.c.
-AC_DEFUN([gl_PREREQ_GETGROUPS],
+AC_DEFUN([gl_FUNC_GETGROUPS],
[
+ AC_REQUIRE([AC_FUNC_GETGROUPS])
AC_REQUIRE([AC_TYPE_GETGROUPS])
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ if test "$ac_cv_func_getgroups" != yes; then
+ AC_LIBOBJ([getgroups])
+ HAVE_GETGROUPS=0
+ elif test "$ac_cv_func_getgroups_works.$ac_cv_type_getgroups" != yes.gid_t
+ then
+ AC_LIBOBJ([getgroups])
+ REPLACE_GETGROUPS=1
+ AC_DEFINE([GETGROUPS_ZERO_BUG], [1], [Define this to 1 if
+ getgroups(0,NULL) does not return the number of groups.])
+ else
+ dnl Detect FreeBSD bug; POSIX requires getgroups(-1,ptr) to fail.
+ AC_CACHE_CHECK([whether getgroups handles negative values],
+ [gl_cv_func_getgroups_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+ [[int size = getgroups (0, 0);
+ gid_t *list = malloc (size * sizeof *list);
+ return getgroups (-1, list) != -1;]])],
+ [gl_cv_func_getgroups_works=yes],
+ [gl_cv_func_getgroups_works=no],
+ [gl_cv_func_getgroups_works="guessing no"])])
+ if test "$gl_cv_func_getgroups_works" != yes; then
+ AC_LIBOBJ([getgroups])
+ REPLACE_GETGROUPS=1
+ fi
+ fi
+ test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS"
])