/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1996-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h> /* alarm() */
#define S_WAITTIME 15
static struct flock flock = {
0, /* l_type */
0, /* l_whence */
0, /* l_start */
0, /* l_len */
0, /* l_sysid */
0 /* l_pid */
};
/*
* yplckpwdf() returns a 0 for a successful lock within W_WAITTIME
* and -1 otherwise
*/
static int fildes = -1;
extern char lockfile[];
/* ARGSUSED */
static void
almhdlr(int sig)
{
}
int
yplckpwdf()
{
int retval;
if ((fildes = creat(lockfile, 0600)) == -1)
return (-1);
flock.l_type = F_WRLCK;
(void) sigset(SIGALRM, almhdlr);
(void) alarm(S_WAITTIME);
retval = fcntl(fildes, F_SETLKW, (int)&flock);
(void) alarm(0);
(void) sigset(SIGALRM, SIG_DFL);
return (retval);
}
/*
* ypulckpwdf() returns 0 for a successful unlock and -1 otherwise
*/
int
ypulckpwdf()
{
if (fildes == -1)
return (-1);
flock.l_type = F_UNLCK;
(void) fcntl(fildes, F_SETLK, (int)&flock);
(void) close(fildes);
fildes = -1;
return (0);
}