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#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 * Return the number of the slot in the utmp file
34 * corresponding to the current user: try for file 0, 1, 2.
35 * Returns -1 if slot not found.
36 */
37
38#include "lint.h"
39#include <string.h>
40#include <stdio.h>
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <unistd.h>
44#include <utmpx.h>
45#include <stdlib.h>
46#include <pthread.h>
47
48#ifndef TRUE
49#define	TRUE 1
50#define	FALSE 0
51#endif
52
53int
54ttyslot(void)
55{
56	struct futmpx ubuf;
57	char *p;
58	int s;
59	int ret = -1;
60	int console = FALSE;
61	char ttynm[128];
62	FILE *fp;
63	int cancel_state;
64
65	/*
66	 * The UNIX98 Posix conformance test suite requires
67	 * ttyslot() to not be a cancellation point.
68	 */
69	(void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state);
70
71	if ((p = ttyname_r(0, ttynm, 128)) != NULL ||
72	    (p = ttyname_r(1, ttynm, 128)) != NULL ||
73	    (p = ttyname_r(2, ttynm, 128)) != NULL) {
74		if (strncmp(p, "/dev/", 5) == 0)
75			p += 5;
76		if (strcmp(p, "console") == 0)
77			console = TRUE;
78		s = 0;
79		if ((fp = fopen(UTMPX_FILE, "rF")) != NULL) {
80			while ((fread(&ubuf, sizeof (ubuf), 1, fp)) == 1) {
81				if ((ubuf.ut_type == INIT_PROCESS ||
82				    ubuf.ut_type == LOGIN_PROCESS ||
83				    ubuf.ut_type == USER_PROCESS) &&
84				    strncmp(p, ubuf.ut_line,
85				    sizeof (ubuf.ut_line)) == 0) {
86					ret = s;
87					if (!console ||
88					    strncmp(ubuf.ut_host, ":0", 2) == 0)
89						break;
90				}
91				s++;
92			}
93			(void) fclose(fp);
94		}
95	}
96
97	(void) pthread_setcancelstate(cancel_state, NULL);
98	return (ret);
99}
100