1 files changed, 50 insertions, 0 deletions
diff --git a/sysdeps/posix/rename.c b/sysdeps/posix/rename.c
new file mode 100644
index 0000000000..3245f9cf9c
--- /dev/null
+++ b/sysdeps/posix/rename.c
@@ -0,0 +1,50 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+/* Rename the file OLD to NEW.  */
+int
+DEFUN(rename, (old, new), CONST char *old AND CONST char *new)
+{
+  int save = errno;
+  if (__link(old, new) < 0)
+    {
+      if (errno == EEXIST)
+	{
+	  errno = save;
+	  /* Race condition, required for 1003.1 conformance.  */
+	  if (__unlink(new) < 0 ||
+	      __link(old, new) < 0)
+	    return -1;
+	}
+      else
+	return -1;
+    }
+  if (__unlink(old) < 0)
+    {
+      save = errno;
+      if (__unlink(new) == 0)
+	errno = save;
+      return -1;
+    }
+  return 0;
+}