X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=m4%2Futimens.m4;h=2baa2561035f528ad7eafd190abb4cd230ab0299;hb=HEAD;hp=9ac9c3ea1ec66abf7e66e0113f5339165e7728af;hpb=138fc7e67e3d9845cd7d81aad0e9c7724784f9b9;p=tar

diff --git a/m4/utimens.m4 b/m4/utimens.m4
index 9ac9c3e..2baa256 100644
--- a/m4/utimens.m4
+++ b/m4/utimens.m4
@@ -1,8 +1,10 @@
-dnl Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+dnl Copyright (C) 2003-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
+dnl serial 4
+
 AC_DEFUN([gl_UTIMENS],
 [
   AC_LIBOBJ([utimens])
@@ -11,5 +13,29 @@ AC_DEFUN([gl_UTIMENS],
   AC_REQUIRE([gl_FUNC_UTIMES])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_UTIMBUF])
-  AC_CHECK_FUNCS_ONCE([futimes futimesat])
+  AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
+
+  if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
+    dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time).  It is not
+    dnl standardized, but Solaris implemented it first and uses it as
+    dnl its only means to set fd time.
+    AC_CACHE_CHECK([whether futimesat handles NULL file],
+      [gl_cv_func_futimesat_works],
+      [touch conftest.file
+       AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <stddef.h>
+#include <sys/times.h>
+]], [[    int fd = open ("conftest.file", O_RDWR);
+          if (fd < 0) return 1;
+          if (futimesat (fd, NULL, NULL)) return 2;
+        ]])],
+        [gl_cv_func_futimesat_works=yes],
+        [gl_cv_func_futimesat_works=no],
+        [gl_cv_func_futimesat_works="guessing no"])
+      rm -f conftest.file])
+    if test "$gl_cv_func_futimesat_works" != yes; then
+      AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
+        [Define to 1 if futimesat mishandles a NULL file name.])
+    fi
+  fi
 ])