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