X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fgetgroups.m4;h=8a5547f432fba5e275ee322709b970f150257c9b;hb=ce38c27828c6a3286e99e312d50fe140a1ec334b;hp=1dd39eacce49a207568e34e68226bbb7596979f3;hpb=a12148fa5481e60f598307f2892da503fefefda6;p=gnulib.git

diff --git a/m4/getgroups.m4 b/m4/getgroups.m4
index 1dd39eacc..8a5547f43 100644
--- a/m4/getgroups.m4
+++ b/m4/getgroups.m4
@@ -1,9 +1,9 @@
-# serial 13
+# serial 15
 
 dnl From Jim Meyering.
 dnl A wrapper around AC_FUNC_GETGROUPS.
 
-# Copyright (C) 1996-1997, 1999-2004, 2008-2009 Free Software Foundation, Inc.
+# Copyright (C) 1996-1997, 1999-2004, 2008-2011 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -17,9 +17,27 @@ AC_DEFUN([gl_FUNC_GETGROUPS],
   if test "$ac_cv_func_getgroups" != yes; then
     AC_LIBOBJ([getgroups])
     HAVE_GETGROUPS=0
-  elif test "$ac_cv_func_getgroups_works" != yes; then
+  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"
 ])