--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgfortran/intrinsics/ierrno.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,49 @@
+/* Implementation of the IERRNO intrinsic.
+   Copyright (C) 2005-2017 Free Software Foundation, Inc.
+   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
+
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
+
+Libgfortran 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 3 of the License, or (at your option) any later version.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+
+#include <errno.h>
+
+
+/* INTEGER FUNCTION IERRNO()  */
+
+extern GFC_INTEGER_4 ierrno_i4 (void);
+export_proto(ierrno_i4);
+
+GFC_INTEGER_4
+ierrno_i4 (void)
+{
+  return (GFC_INTEGER_4) errno;
+}
+
+extern GFC_INTEGER_8 ierrno_i8 (void);
+export_proto(ierrno_i8);
+
+GFC_INTEGER_8
+ierrno_i8 (void)
+{
+  return (GFC_INTEGER_8) errno;
+}