1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1996-2001 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33#include <stdio.h>
34#include <signal.h>
35#include <fcntl.h>
36#include <unistd.h> /* alarm() */
37
38#define	S_WAITTIME	15
39
40static struct flock flock =	{
41			0,	/* l_type */
42			0,	/* l_whence */
43			0,	/* l_start */
44			0,	/* l_len */
45			0,	/* l_sysid */
46			0	/* l_pid */
47			};
48
49/*
50 *	yplckpwdf() returns a 0 for a successful lock within W_WAITTIME
51 *	and -1 otherwise
52 */
53
54static int fildes = -1;
55extern char lockfile[];
56
57/* ARGSUSED */
58static void
59almhdlr(int sig)
60{
61}
62
63int
64yplckpwdf()
65{
66	int retval;
67	if ((fildes = creat(lockfile, 0600)) == -1)
68		return (-1);
69
70	flock.l_type = F_WRLCK;
71	(void) sigset(SIGALRM, almhdlr);
72	(void) alarm(S_WAITTIME);
73	retval = fcntl(fildes, F_SETLKW, (int)&flock);
74	(void) alarm(0);
75	(void) sigset(SIGALRM, SIG_DFL);
76	return (retval);
77
78}
79
80/*
81 *	ypulckpwdf() returns 0 for a successful unlock and -1 otherwise
82 */
83int
84ypulckpwdf()
85{
86	if (fildes == -1)
87		return (-1);
88
89	flock.l_type = F_UNLCK;
90	(void) fcntl(fildes, F_SETLK, (int)&flock);
91	(void) close(fildes);
92	fildes = -1;
93	return (0);
94
95}
96