mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/*
|
|
* 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 <sgtty.h>
|
|
#include <db.h>
|
|
#include <string.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 sgttyb ttyb;
|
|
DB *db;
|
|
DBT data, key;
|
|
struct {
|
|
mode_t type;
|
|
dev_t dev;
|
|
} bkey;
|
|
|
|
/* Must be a terminal. */
|
|
if (ioctl(fd, TIOCGETP, &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);
|
|
}
|