* m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Fix typo in comment.

[gnulib.git] / m4 / acl.m4

diff --git a/m4/acl.m4 b/m4/acl.m4
index 9c7d446..6e6bd08 100644 (file)
--- a/m4/acl.m4
+++ b/m4/acl.m4
@@ -1,26 +1,78 @@
 # acl.m4 - check for access control list (ACL) primitives
 
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004, 2005, 2006, 2007 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.
 
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software Foundation,
-# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
-# Written by Paul Eggert.
+# Written by Paul Eggert and Jim Meyering.
 
 AC_DEFUN([AC_FUNC_ACL],
 [
+  AC_LIBOBJ([acl])
+  AC_LIBOBJ([file-has-acl])
+
   dnl Prerequisites of lib/acl.c.
   AC_CHECK_HEADERS(sys/acl.h)
   AC_CHECK_FUNCS(acl)
+  ac_save_LIBS="$LIBS"
+    AC_SEARCH_LIBS(acl_get_file, acl,
+                  [test "$ac_cv_search_acl_get_file" = "none required" ||
+                   LIB_ACL=$ac_cv_search_acl_get_file])
+    AC_SUBST(LIB_ACL)
+    AC_CHECK_HEADERS(acl/libacl.h)
+    AC_CHECK_FUNCS(acl_get_file acl_get_fd acl_set_file acl_set_fd \
+                  acl_free acl_from_mode acl_from_text \
+                  acl_delete_def_file acl_extended_file)
+    if test $ac_cv_header_sys_acl_h = yes; then
+      use_acl=1
+      if test $ac_cv_func_acl_get_file = yes; then
+       # If we detect the acl_get_file bug, disable ACL support altogether.
+       gl_ACL_GET_FILE( , [use_acl=0])
+      fi
+    else
+      use_acl=0
+    fi
+    if test $use_acl = 1 &&
+       test $ac_cv_func_acl_get_file = yes &&
+       test $ac_cv_func_acl_free = yes; then
+      AC_REPLACE_FUNCS([acl_entries])
+    fi
+  LIBS="$ac_save_LIBS"
+  if test $use_acl = 1; then
+    ac_save_LIBS="$LIBS"
+    AC_SEARCH_LIBS([acl_trivial], [sec],
+      [AC_DEFINE([HAVE_ACL_TRIVIAL], 1,
+        [Define to 1 if you have the `acl_trivial' function.])
+       test "$ac_cv_search_acl_trivial" = "none required" ||
+       LIB_ACL_TRIVIAL="$ac_cv_search_acl_trivial"])
+    AC_SUBST([LIB_ACL_TRIVIAL])
+    LIBS="$ac_save_LIBS"
+  fi
+  AC_DEFINE_UNQUOTED(USE_ACL, $use_acl,
+                    [Define if you want access control list support.])
+])
+
+# gl_ACL_GET_FILE(IF-WORKS, IF-NOT)
+# -------------------------------------
+# If `acl_get_file' works (does not have a particular bug),
+# run IF-WORKS, otherwise, IF-NOT.
+# This tests for a Darwin 8.7.0 bug, whereby acl_get_file returns NULL,
+# but sets errno = ENOENT for an existing file or directory.
+AC_DEFUN([gl_ACL_GET_FILE],
+[
+  AC_CACHE_CHECK([for working acl_get_file], gl_cv_func_working_acl_get_file,
+    [AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(
+         [[#include <sys/types.h>
+          #include <sys/acl.h>
+          #include <errno.h>
+         ]],
+         [[return !! (!acl_get_file (".", ACL_TYPE_ACCESS)
+                      && errno == ENOENT);]])],
+       [gl_cv_func_working_acl_get_file=yes],
+       [gl_cv_func_working_acl_get_file=no],
+       [gl_cv_func_working_acl_get_file=cross-compiling])])
+
+  AS_IF([test $gl_cv_func_working_acl_get_file = yes], [$1], [$2])
 ])