pipe: Set errno upon failure.

[gnulib.git] / m4 / fdopendir.m4

diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
index 09670bb..7282d4b 100644 (file)
--- a/m4/fdopendir.m4
+++ b/m4/fdopendir.m4
@@ -1,7 +1,7 @@
-# serial 1
+# serial 3
 # See if we need to provide fdopendir.
 
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2010 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.
@@ -17,5 +17,22 @@ AC_DEFUN([gl_FUNC_FDOPENDIR],
     AC_LIBOBJ([fdopendir])
     gl_REPLACE_DIRENT_H
     HAVE_FDOPENDIR=0
+  else
+    AC_CACHE_CHECK([whether fdopendir works],
+      [gl_cv_func_fdopendir_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <dirent.h>
+#include <fcntl.h>
+]], [int fd = open ("conftest.c", O_RDONLY);
+     if (fd < 0) return 2;
+     return !!fdopendir (fd);])],
+         [gl_cv_func_fdopendir_works=yes],
+         [gl_cv_func_fdopendir_works=no],
+         [gl_cv_func_fdopendir_works="guessing no"])])
+    if test "$gl_cv_func_fdopendir_works" != yes; then
+      REPLACE_FDOPENDIR=1
+      gl_REPLACE_DIRENT_H
+      AC_LIBOBJ([fdopendir])
+    fi
   fi
 ])