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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Return the number of the slot in the utmp file
32 * corresponding to the current user: try for file 0, 1, 2.
33 * Returns -1 if slot not found.
34 */
35
36 #include "lint.h"
37 #include <string.h>
38 #include <stdio.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #include <unistd.h>
42 #include <utmpx.h>
43 #include <stdlib.h>
44 #include <pthread.h>
45
46 #ifndef TRUE
47 #define TRUE 1
48 #define FALSE 0
49 #endif
50
51 int
ttyslot(void)52 ttyslot(void)
53 {
54 struct futmpx ubuf;
55 char *p;
56 int s;
57 int ret = -1;
58 int console = FALSE;
59 char ttynm[128];
60 FILE *fp;
61 int cancel_state;
62
63 /*
64 * The UNIX98 Posix conformance test suite requires
65 * ttyslot() to not be a cancellation point.
66 */
67 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state);
68
69 if ((p = ttyname_r(0, ttynm, 128)) != NULL ||
70 (p = ttyname_r(1, ttynm, 128)) != NULL ||
71 (p = ttyname_r(2, ttynm, 128)) != NULL) {
72 if (strncmp(p, "/dev/", 5) == 0)
73 p += 5;
74 if (strcmp(p, "console") == 0)
75 console = TRUE;
76 s = 0;
77 if ((fp = fopen(UTMPX_FILE, "rF")) != NULL) {
78 while ((fread(&ubuf, sizeof (ubuf), 1, fp)) == 1) {
79 if ((ubuf.ut_type == INIT_PROCESS ||
80 ubuf.ut_type == LOGIN_PROCESS ||
81 ubuf.ut_type == USER_PROCESS) &&
82 strncmp(p, ubuf.ut_line,
83 sizeof (ubuf.ut_line)) == 0) {
84 ret = s;
85 if (!console ||
86 strncmp(ubuf.ut_host, ":0", 2) == 0)
87 break;
88 }
89 s++;
90 }
91 (void) fclose(fp);
92 }
93 }
94
95 (void) pthread_setcancelstate(cancel_state, NULL);
96 return (ret);
97 }
98