2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/lib/libc/gen/ttyname.c,v 1.10.6.2 2002/10/15 19:46:46 fjoe Exp $
34 * $DragonFly: src/lib/libc/gen/ttyname.c,v 1.14 2005/11/19 22:32:53 swildner Exp $
36 * @(#)ttyname.c 8.2 (Berkeley) 1/27/94
39 #include "namespace.h"
40 #include <sys/types.h>
52 #include "un-namespace.h"
55 #include "libc_private.h"
57 static char static_buf[TTY_PATH_MAX] = _PATH_DEV;
58 static char *oldttyname(int, struct stat *);
59 static char *ttyname_threaded(int fd);
60 static char *ttyname_unthreaded(int fd);
61 extern int __sys_fstat(int, struct stat *);
63 static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
64 static pthread_key_t ttyname_key;
65 static int ttyname_init = 0;
72 if (__isthreaded == 0)
73 ret = ttyname_unthreaded(fd);
75 ret = ttyname_threaded(fd);
80 ttyname_r(int fd, char *buf, size_t len)
91 /* Must be a terminal. */
94 /* Must be a character device. */
95 if (__sys_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
97 /* Must have enough room */
98 if (len <= sizeof(_PATH_DEV))
101 if ((dp = opendir(_PATH_DEV)) != NULL) {
102 memcpy(buf, _PATH_DEV, sizeof(_PATH_DEV));
103 for (rval = NULL; (dirp = readdir(dp)) != NULL;) {
104 if (dirp->d_ino != sb.st_ino)
106 minlen = (len - (sizeof(_PATH_DEV) - 1)) < (dirp->d_namlen + 1) ?
107 (len - (sizeof(_PATH_DEV) - 1)) : (dirp->d_namlen + 1);
108 memcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name, minlen);
109 if (stat(buf, &dsb) || sb.st_dev != dsb.st_dev ||
110 sb.st_ino != dsb.st_ino)
121 ttyname_threaded(int fd)
125 if (ttyname_init == 0) {
126 _pthread_mutex_lock(&ttyname_lock);
127 if (ttyname_init == 0) {
128 if (_pthread_key_create(&ttyname_key, free)) {
129 _pthread_mutex_unlock(&ttyname_lock);
134 _pthread_mutex_unlock(&ttyname_lock);
137 /* Must have thread specific data field to put data */
138 if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
139 if ((buf = malloc(TTY_PATH_MAX)) != NULL) {
140 if (_pthread_setspecific(ttyname_key, buf) != 0) {
148 return (ttyname_r(fd, buf, TTY_PATH_MAX));
152 ttyname_unthreaded(int fd)
163 /* Must be a terminal. */
164 if (tcgetattr(fd, &ttyb) < 0)
166 /* Must be a character device. */
167 if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
170 if ( (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) ) {
171 memset(&bkey, 0, sizeof(bkey));
173 bkey.dev = sb.st_rdev;
175 key.size = sizeof(bkey);
176 if (!(db->get)(db, &key, &data, 0) &&
177 (sizeof(_PATH_DEV) + data.size - 1 < sizeof(static_buf))) {
179 static_buf + sizeof(_PATH_DEV) - 1, data.size);
185 return (oldttyname(fd, &sb));
189 oldttyname(int fd __unused, struct stat *sb)
195 if ((dp = opendir(_PATH_DEV)) == NULL)
198 while ( (dirp = readdir(dp)) ) {
199 if (dirp->d_ino != sb->st_ino)
201 if (sizeof(_PATH_DEV) + dirp->d_namlen >= sizeof(static_buf))
203 bcopy(dirp->d_name, static_buf + sizeof(_PATH_DEV) - 1,
205 if (stat(static_buf, &dsb) || sb->st_dev != dsb.st_dev ||
206 sb->st_ino != dsb.st_ino)