--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/osdep/unix/crx_std.c	Mon Sep 14 15:17:45 2009 +0900
@@ -0,0 +1,45 @@
+/* ========================================================================
+ * Copyright 1988-2006 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	Exclusive create of a file
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	17 December 1999
+ * Last Edited:	30 August 2006
+ */
+
+/* Exclusive create of a file
+ * Accepts: file name
+ * Return: T if success, NIL if failed, -1 if retry
+ */
+
+long crexcl (char *name)
+{
+  int i;
+  int mask = umask (0);
+  long ret = LONGT;
+				/* try to get the lock */
+  if ((i = open (name,O_WRONLY|O_CREAT|O_EXCL,(int) shlock_mode)) < 0)
+    ret = (errno == EEXIST) ? -1 : NIL;
+  else close (i);		/* made the file, now close it */
+  umask (mask);			/* restore previous mask */
+  return LONGT;			/* success */
+}