125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/* $NetBSD: ttyname.c,v 1.13 1998/02/27 19:01:03 perry Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
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#else
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__RCSID("$NetBSD: ttyname.c,v 1.13 1998/02/27 19:01:03 perry Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <termios.h>
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#include <db.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.h>
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#ifdef __weak_alias
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__weak_alias(ttyname,_ttyname);
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#endif
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static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
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static char *oldttyname __P((struct stat *));
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char *
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ttyname(fd)
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int fd;
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{
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struct stat sb;
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struct termios ttyb;
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DB *db;
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DBT data, key;
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struct {
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mode_t type;
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dev_t dev;
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} bkey;
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/* Must be a terminal. */
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if (tcgetattr(fd, &ttyb) < 0)
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return (NULL);
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/* Must be a character device. */
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if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
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return (NULL);
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if ((db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) != NULL) {
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memset(&bkey, 0, sizeof(bkey));
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bkey.type = S_IFCHR;
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bkey.dev = sb.st_rdev;
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key.data = &bkey;
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key.size = sizeof(bkey);
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if (!(db->get)(db, &key, &data, 0)) {
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bcopy(data.data,
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buf + sizeof(_PATH_DEV) - 1, data.size);
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(void)(db->close)(db);
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return (buf);
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}
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(void)(db->close)(db);
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}
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return (oldttyname(&sb));
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}
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static char *
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oldttyname(sb)
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struct stat *sb;
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{
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struct dirent *dirp;
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DIR *dp;
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struct stat dsb;
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if ((dp = opendir(_PATH_DEV)) == NULL)
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return (NULL);
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while ((dirp = readdir(dp)) != NULL) {
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if (dirp->d_fileno != sb->st_ino)
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continue;
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bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1,
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(size_t)(dirp->d_namlen + 1));
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if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev ||
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sb->st_ino != dsb.st_ino)
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continue;
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(void)closedir(dp);
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return (buf);
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}
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(void)closedir(dp);
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return (NULL);
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}
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