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- /* $NetBSD: ttyname.c,v 1.9 1995/05/02 01:45:33 mycroft Exp $ */
-
- /*
- * 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)
- #if 0
- static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
- #else
- static char rcsid[] = "$NetBSD: ttyname.c,v 1.9 1995/05/02 01:45:33 mycroft Exp $";
- #endif
- #endif /* LIBC_SCCS and not lint */
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <dirent.h>
- #include <termios.h>
- #include <db.h>
- #include <string.h>
- #include <unistd.h>
- #include <paths.h>
-
- 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);
- }
-