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/* ========================================================================
* 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 */
}
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