| 1 |
39 |
lampret |
/*
|
| 2 |
|
|
* Copyright (c) 1988 The Regents of the University of California.
|
| 3 |
|
|
* All rights reserved.
|
| 4 |
|
|
*
|
| 5 |
|
|
* Redistribution and use in source and binary forms, with or without
|
| 6 |
|
|
* modification, are permitted provided that the following conditions
|
| 7 |
|
|
* are met:
|
| 8 |
|
|
* 1. Redistributions of source code must retain the above copyright
|
| 9 |
|
|
* notice, this list of conditions and the following disclaimer.
|
| 10 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
| 11 |
|
|
* notice, this list of conditions and the following disclaimer in the
|
| 12 |
|
|
* documentation and/or other materials provided with the distribution.
|
| 13 |
|
|
* 3. All advertising materials mentioning features or use of this software
|
| 14 |
|
|
* must display the following acknowledgement:
|
| 15 |
|
|
* This product includes software developed by the University of
|
| 16 |
|
|
* California, Berkeley and its contributors.
|
| 17 |
|
|
* 4. Neither the name of the University nor the names of its contributors
|
| 18 |
|
|
* may be used to endorse or promote products derived from this software
|
| 19 |
|
|
* without specific prior written permission.
|
| 20 |
|
|
*
|
| 21 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
| 22 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 23 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 24 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
| 25 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
| 26 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
| 27 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
| 28 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
| 29 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
| 30 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 31 |
|
|
* SUCH DAMAGE.
|
| 32 |
|
|
*/
|
| 33 |
|
|
|
| 34 |
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
| 35 |
|
|
static char sccsid[] = "@(#)ttyname.c 5.10 (Berkeley) 5/6/91";
|
| 36 |
|
|
#endif /* LIBC_SCCS and not lint */
|
| 37 |
|
|
|
| 38 |
|
|
#include <sys/types.h>
|
| 39 |
|
|
#include <sys/stat.h>
|
| 40 |
|
|
#include <fcntl.h>
|
| 41 |
|
|
#include <dirent.h>
|
| 42 |
|
|
#include <termios.h>
|
| 43 |
|
|
#include <unistd.h>
|
| 44 |
|
|
#include <paths.h>
|
| 45 |
|
|
#include <_syslist.h>
|
| 46 |
|
|
|
| 47 |
|
|
static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
|
| 48 |
|
|
|
| 49 |
|
|
char *
|
| 50 |
|
|
ttyname (fd)
|
| 51 |
|
|
int fd;
|
| 52 |
|
|
{
|
| 53 |
|
|
struct stat sb;
|
| 54 |
|
|
struct termios tty;
|
| 55 |
|
|
struct dirent *dirp;
|
| 56 |
|
|
DIR *dp;
|
| 57 |
|
|
struct stat dsb;
|
| 58 |
|
|
char *rval;
|
| 59 |
|
|
|
| 60 |
|
|
/* Must be a terminal. */
|
| 61 |
|
|
if (tcgetattr (fd, &tty) < 0)
|
| 62 |
|
|
return NULL;
|
| 63 |
|
|
|
| 64 |
|
|
/* Must be a character device. */
|
| 65 |
|
|
if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))
|
| 66 |
|
|
return NULL;
|
| 67 |
|
|
|
| 68 |
|
|
if ((dp = _opendir (_PATH_DEV)) == NULL)
|
| 69 |
|
|
return NULL;
|
| 70 |
|
|
|
| 71 |
|
|
for (rval = NULL; dirp = _readdir (dp);)
|
| 72 |
|
|
{
|
| 73 |
|
|
if (dirp->d_ino != sb.st_ino)
|
| 74 |
|
|
continue;
|
| 75 |
|
|
strcpy (buf + sizeof (_PATH_DEV) - 1, dirp->d_name);
|
| 76 |
|
|
if (stat (buf, &dsb) || sb.st_dev != dsb.st_dev ||
|
| 77 |
|
|
sb.st_ino != dsb.st_ino)
|
| 78 |
|
|
continue;
|
| 79 |
|
|
(void) _closedir (dp);
|
| 80 |
|
|
rval = buf;
|
| 81 |
|
|
break;
|
| 82 |
|
|
}
|
| 83 |
|
|
(void) _closedir (dp);
|
| 84 |
|
|
return rval;
|
| 85 |
|
|
}
|
