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-rw-r--r--lib/libc/gen/ttyname.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c
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+++ b/lib/libc/gen/ttyname.c
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+/*
+ * Copyright (c) 1988, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <db.h>
+#include <string.h>
+#include <paths.h>
+
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+static struct pthread_mutex _ttyname_lockd = PTHREAD_MUTEX_STATIC_INITIALIZER;
+static pthread_mutex_t ttyname_lock = &_ttyname_lockd;
+static pthread_key_t ttyname_key;
+static int ttyname_init = 0;
+
+char *
+ttyname(int fd)
+{
+ char *ret;
+
+ if (_FD_LOCK(fd, FD_READ, NULL) == 0) {
+ ret = __ttyname_basic(fd);
+ _FD_UNLOCK(fd, FD_READ);
+ } else {
+ ret = NULL;
+ }
+
+ return (ret);
+}
+
+char *
+__ttyname_r_basic(int fd, char *buf, size_t len)
+{
+ register struct dirent *dirp;
+ register DIR *dp;
+ struct stat dsb;
+ struct stat sb;
+ char *rval;
+ int minlen;
+
+ rval = NULL;
+
+ /* Must be a terminal. */
+ if (!isatty(fd))
+ return (rval);
+ /* Must be a character device. */
+ if (_thread_sys_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
+ return (rval);
+ /* Must have enough room */
+ if (len <= sizeof(_PATH_DEV))
+ return (rval);
+
+ if ((dp = opendir(_PATH_DEV)) != NULL) {
+ memcpy(buf, _PATH_DEV, sizeof(_PATH_DEV));
+ for (rval = NULL; (dirp = readdir(dp)) != NULL;) {
+ if (dirp->d_fileno != sb.st_ino)
+ continue;
+ minlen = (len - (sizeof(_PATH_DEV) - 1)) < (dirp->d_namlen + 1) ?
+ (len - (sizeof(_PATH_DEV) - 1)) : (dirp->d_namlen + 1);
+ memcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name, minlen);
+ if (stat(buf, &dsb) || sb.st_dev != dsb.st_dev ||
+ sb.st_ino != dsb.st_ino)
+ continue;
+ rval = buf;
+ break;
+ }
+ (void) closedir(dp);
+ }
+ return (rval);
+}
+
+char *
+__ttyname_basic(int fd)
+{
+ char *buf;
+
+ pthread_mutex_lock(&ttyname_lock);
+ if (ttyname_init == 0) {
+ if (pthread_key_create(&ttyname_key, free)) {
+ pthread_mutex_unlock(&ttyname_lock);
+ return (NULL);
+ }
+ ttyname_init = 1;
+ }
+ pthread_mutex_unlock(&ttyname_lock);
+
+ /* Must have thread specific data field to put data */
+ if ((buf = pthread_getspecific(ttyname_key)) == NULL) {
+ if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
+ if (pthread_setspecific(ttyname_key, buf) != 0) {
+ free(buf);
+ return (NULL);
+ }
+ } else {
+ return (NULL);
+ }
+ }
+ return (__ttyname_r_basic(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
+}
+
+char *
+ttyname_r(int fd, char *buf, size_t len)
+{
+ char *ret;
+
+ if (_FD_LOCK(fd, FD_READ, NULL) == 0) {
+ ret = __ttyname_r_basic(fd, buf, len);
+ _FD_UNLOCK(fd, FD_READ);
+ } else {
+ ret = NULL;
+ }
+ return (ret);
+}
+#else
+static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
+static char *oldttyname __P((int, struct stat *));
+
+char *
+ttyname(fd)
+ int fd;
+{
+ struct stat sb;
+ struct termios ttyb;
+ DB *db;
+ DBT data, key;
+ struct {
+ mode_t type;
+ dev_t dev;
+ } bkey;
+
+ /* Must be a terminal. */
+ if (tcgetattr(fd, &ttyb) < 0)
+ return (NULL);
+ /* Must be a character device. */
+ if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
+ return (NULL);
+
+ if ( (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) ) {
+ memset(&bkey, 0, sizeof(bkey));
+ bkey.type = S_IFCHR;
+ bkey.dev = sb.st_rdev;
+ key.data = &bkey;
+ key.size = sizeof(bkey);
+ if (!(db->get)(db, &key, &data, 0)) {
+ bcopy(data.data,
+ buf + sizeof(_PATH_DEV) - 1, data.size);
+ (void)(db->close)(db);
+ return (buf);
+ }
+ (void)(db->close)(db);
+ }
+ return (oldttyname(fd, &sb));
+}
+
+static char *
+oldttyname(fd, sb)
+ int fd;
+ struct stat *sb;
+{
+ register struct dirent *dirp;
+ register DIR *dp;
+ struct stat dsb;
+
+ if ((dp = opendir(_PATH_DEV)) == NULL)
+ return (NULL);
+
+ while ( (dirp = readdir(dp)) ) {
+ if (dirp->d_fileno != sb->st_ino)
+ continue;
+ bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1,
+ dirp->d_namlen + 1);
+ if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev ||
+ sb->st_ino != dsb.st_ino)
+ continue;
+ (void)closedir(dp);
+ return (buf);
+ }
+ (void)closedir(dp);
+ return (NULL);
+}
+#endif
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