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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 $
34 * $DragonFly: src/lib/libc/gen/ttyname.c,v 1.12 2005/08/27 20:23:05 joerg 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 __P((int, struct stat *));
59 static char *ttyname_threaded(int fd);
60 static char *ttyname_unthreaded(int fd);
62 static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
63 static pthread_key_t ttyname_key;
64 static int ttyname_init = 0;
71 if (__isthreaded == 0)
72 ret = ttyname_unthreaded(fd);
74 ret = ttyname_threaded(fd);
79 ttyname_r(int fd, char *buf, size_t len)
90 /* Must be a terminal. */
93 /* Must be a character device. */
94 if (__sys_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
96 /* Must have enough room */
97 if (len <= sizeof(_PATH_DEV))
100 if ((dp = opendir(_PATH_DEV)) != NULL) {
101 memcpy(buf, _PATH_DEV, sizeof(_PATH_DEV));
102 for (rval = NULL; (dirp = readdir(dp)) != NULL;) {
103 if (dirp->d_ino != sb.st_ino)
105 minlen = (len - (sizeof(_PATH_DEV) - 1)) < (dirp->d_namlen + 1) ?
106 (len - (sizeof(_PATH_DEV) - 1)) : (dirp->d_namlen + 1);
107 memcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name, minlen);
108 if (stat(buf, &dsb) || sb.st_dev != dsb.st_dev ||
109 sb.st_ino != dsb.st_ino)
120 ttyname_threaded(int fd)
124 if (ttyname_init == 0) {
125 _pthread_mutex_lock(&ttyname_lock);
126 if (ttyname_init == 0) {
127 if (_pthread_key_create(&ttyname_key, free)) {
128 _pthread_mutex_unlock(&ttyname_lock);
133 _pthread_mutex_unlock(&ttyname_lock);
136 /* Must have thread specific data field to put data */
137 if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
138 if ((buf = malloc(TTY_PATH_MAX)) != NULL) {
139 if (_pthread_setspecific(ttyname_key, buf) != 0) {
147 return (ttyname_r(fd, buf, TTY_PATH_MAX));
151 ttyname_unthreaded(int fd)
162 /* Must be a terminal. */
163 if (tcgetattr(fd, &ttyb) < 0)
165 /* Must be a character device. */
166 if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
169 if ( (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) ) {
170 memset(&bkey, 0, sizeof(bkey));
172 bkey.dev = sb.st_rdev;
174 key.size = sizeof(bkey);
175 if (!(db->get)(db, &key, &data, 0) &&
176 (sizeof(_PATH_DEV) + data.size - 1 < sizeof(static_buf))) {
178 static_buf + sizeof(_PATH_DEV) - 1, data.size);
179 (void)(db->close)(db);
182 (void)(db->close)(db);
184 return (oldttyname(fd, &sb));
196 if ((dp = opendir(_PATH_DEV)) == NULL)
199 while ( (dirp = readdir(dp)) ) {
200 if (dirp->d_ino != sb->st_ino)
202 if (sizeof(_PATH_DEV) + dirp->d_namlen >= sizeof(static_buf))
204 bcopy(dirp->d_name, static_buf + sizeof(_PATH_DEV) - 1,
206 if (stat(static_buf, &dsb) || sb->st_dev != dsb.st_dev ||
207 sb->st_ino != dsb.st_ino)