--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgfortran/intrinsics/unlink.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,86 @@
+/* Implementation of the UNLINK intrinsic.
+   Copyright (C) 2004-2017 Free Software Foundation, Inc.
+   Contributed by Steven G. Kargl <kargls@comcast.net>.
+
+This file is part of the GNU Fortran 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>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* SUBROUTINE UNLINK(NAME, STATUS)
+   CHARACTER(LEN= ), INTENT(IN) :: NAME
+   INTEGER, INTENT(OUT), OPTIONAL :: STATUS)  */
+
+extern void unlink_i4_sub (char *name, GFC_INTEGER_4 *status,
+			   gfc_charlen_type name_len);
+iexport_proto(unlink_i4_sub);
+
+void
+unlink_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)
+{
+  char *str;
+  GFC_INTEGER_4 stat;
+
+  /* Make a null terminated copy of the string.  */
+  str = fc_strdup (name, name_len);
+
+  stat = unlink (str);
+
+  free (str);
+
+  if (status != NULL)
+    *status = (stat == 0) ? stat : errno;
+}
+iexport(unlink_i4_sub);
+
+extern void unlink_i8_sub (char *name, GFC_INTEGER_8 *status,
+			   gfc_charlen_type name_len);
+export_proto(unlink_i8_sub);
+
+void
+unlink_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)
+{
+  GFC_INTEGER_4 status4;
+  unlink_i4_sub (name, &status4, name_len);
+  if (status)
+    *status = status4;
+}
+
+
+/* INTEGER FUNCTION UNLINK(NAME)
+   CHARACTER(LEN= ), INTENT(IN) :: NAME  */
+
+extern GFC_INTEGER_4 PREFIX(unlink) (char *, gfc_charlen_type);
+export_proto_np(PREFIX(unlink));
+
+GFC_INTEGER_4
+PREFIX(unlink) (char *name, gfc_charlen_type name_len)
+{
+  GFC_INTEGER_4 status;
+  unlink_i4_sub (name, &status, name_len);
+  return status;
+}