1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/osdep/unix/crx_std.c	Mon Sep 14 15:17:45 2009 +0900
     1.3 @@ -0,0 +1,45 @@
     1.4 +/* ========================================================================
     1.5 + * Copyright 1988-2006 University of Washington
     1.6 + *
     1.7 + * Licensed under the Apache License, Version 2.0 (the "License");
     1.8 + * you may not use this file except in compliance with the License.
     1.9 + * You may obtain a copy of the License at
    1.10 + *
    1.11 + *     http://www.apache.org/licenses/LICENSE-2.0
    1.12 + *
    1.13 + * 
    1.14 + * ========================================================================
    1.15 + */
    1.16 +
    1.17 +/*
    1.18 + * Program:	Exclusive create of a file
    1.19 + *
    1.20 + * Author:	Mark Crispin
    1.21 + *		Networks and Distributed Computing
    1.22 + *		Computing & Communications
    1.23 + *		University of Washington
    1.24 + *		Administration Building, AG-44
    1.25 + *		Seattle, WA  98195
    1.26 + *		Internet: MRC@CAC.Washington.EDU
    1.27 + *
    1.28 + * Date:	17 December 1999
    1.29 + * Last Edited:	30 August 2006
    1.30 + */
    1.31 +
    1.32 +/* Exclusive create of a file
    1.33 + * Accepts: file name
    1.34 + * Return: T if success, NIL if failed, -1 if retry
    1.35 + */
    1.36 +
    1.37 +long crexcl (char *name)
    1.38 +{
    1.39 +  int i;
    1.40 +  int mask = umask (0);
    1.41 +  long ret = LONGT;
    1.42 +				/* try to get the lock */
    1.43 +  if ((i = open (name,O_WRONLY|O_CREAT|O_EXCL,(int) shlock_mode)) < 0)
    1.44 +    ret = (errno == EEXIST) ? -1 : NIL;
    1.45 +  else close (i);		/* made the file, now close it */
    1.46 +  umask (mask);			/* restore previous mask */
    1.47 +  return LONGT;			/* success */
    1.48 +}