1 /* $NetBSD: logout.c,v 1.16 2005/08/27 17:07:17 elad Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)logout.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: logout.c,v 1.16 2005/08/27 17:07:17 elad Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <sys/types.h>
42 #include <sys/time.h>
43
44 #include <assert.h>
45 #include <fcntl.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <time.h>
49 #include <unistd.h>
50 #include <util.h>
51 #include <utmp.h>
52
53 int
logout(const char * line)54 logout(const char *line)
55 {
56 int fd, rval;
57 struct utmp ut;
58
59 _DIAGASSERT(line != NULL);
60
61 if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0)
62 return(0);
63 rval = 0;
64 while (read(fd, &ut, sizeof(ut)) == sizeof(ut)) {
65 if (!ut.ut_name[0] || strncmp(ut.ut_line, line,
66 (size_t)UT_LINESIZE))
67 continue;
68 memset(ut.ut_name, 0, (size_t)UT_NAMESIZE);
69 memset(ut.ut_host, 0, (size_t)UT_HOSTSIZE);
70 (void)time(&ut.ut_time);
71 (void)lseek(fd, -(off_t)sizeof(ut), SEEK_CUR);
72 (void)write(fd, &ut, sizeof(ut));
73 rval = 1;
74 }
75 (void)close(fd);
76 return(rval);
77 }
78