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.
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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
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33 * $FreeBSD: src/lib/libc/gen/ttyname.c,v 1.10.6.2 2002/10/15 19:46:46 fjoe Exp $
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
38 #endif /* LIBC_SCCS and not lint */
40 #include <sys/types.h>
53 #include "pthread_private.h"
54 static struct pthread_mutex _ttyname_lockd = PTHREAD_MUTEX_STATIC_INITIALIZER;
55 static pthread_mutex_t ttyname_lock = &_ttyname_lockd;
56 static pthread_key_t ttyname_key;
57 static int ttyname_init = 0;
64 if (_FD_LOCK(fd, FD_READ, NULL) == 0) {
65 ret = __ttyname_basic(fd);
66 _FD_UNLOCK(fd, FD_READ);
75 __ttyname_r_basic(int fd, char *buf, size_t len)
77 register struct dirent *dirp;
86 /* Must be a terminal. */
89 /* Must be a character device. */
90 if (__sys_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
92 /* Must have enough room */
93 if (len <= sizeof(_PATH_DEV))
96 if ((dp = opendir(_PATH_DEV)) != NULL) {
97 memcpy(buf, _PATH_DEV, sizeof(_PATH_DEV));
98 for (rval = NULL; (dirp = readdir(dp)) != NULL;) {
99 if (dirp->d_fileno != sb.st_ino)
101 minlen = (len - (sizeof(_PATH_DEV) - 1)) < (dirp->d_namlen + 1) ?
102 (len - (sizeof(_PATH_DEV) - 1)) : (dirp->d_namlen + 1);
103 memcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name, minlen);
104 if (stat(buf, &dsb) || sb.st_dev != dsb.st_dev ||
105 sb.st_ino != dsb.st_ino)
116 __ttyname_basic(int fd)
120 pthread_mutex_lock(&ttyname_lock);
121 if (ttyname_init == 0) {
122 if (pthread_key_create(&ttyname_key, free)) {
123 pthread_mutex_unlock(&ttyname_lock);
128 pthread_mutex_unlock(&ttyname_lock);
130 /* Must have thread specific data field to put data */
131 if ((buf = pthread_getspecific(ttyname_key)) == NULL) {
132 if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
133 if (pthread_setspecific(ttyname_key, buf) != 0) {
141 return (__ttyname_r_basic(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
145 ttyname_r(int fd, char *buf, size_t len)
149 if (_FD_LOCK(fd, FD_READ, NULL) == 0) {
150 ret = __ttyname_r_basic(fd, buf, len);
151 _FD_UNLOCK(fd, FD_READ);
158 static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
159 static char *oldttyname __P((int, struct stat *));
174 /* Must be a terminal. */
175 if (tcgetattr(fd, &ttyb) < 0)
177 /* Must be a character device. */
178 if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
181 if ( (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) ) {
182 memset(&bkey, 0, sizeof(bkey));
184 bkey.dev = sb.st_rdev;
186 key.size = sizeof(bkey);
187 if (!(db->get)(db, &key, &data, 0)) {
189 buf + sizeof(_PATH_DEV) - 1, data.size);
190 (void)(db->close)(db);
193 (void)(db->close)(db);
195 return (oldttyname(fd, &sb));
203 register struct dirent *dirp;
207 if ((dp = opendir(_PATH_DEV)) == NULL)
210 while ( (dirp = readdir(dp)) ) {
211 if (dirp->d_fileno != sb->st_ino)
213 bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1,
215 if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev ||
216 sb->st_ino != dsb.st_ino)