| 1 | #ifndef _NO_TTYNAME |
|---|
| 2 | /* |
|---|
| 3 | * Copyright (c) 1988 The Regents of the University of California. |
|---|
| 4 | * All rights reserved. |
|---|
| 5 | * |
|---|
| 6 | * Redistribution and use in source and binary forms, with or without |
|---|
| 7 | * modification, are permitted provided that the following conditions |
|---|
| 8 | * are met: |
|---|
| 9 | * 1. Redistributions of source code must retain the above copyright |
|---|
| 10 | * notice, this list of conditions and the following disclaimer. |
|---|
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the |
|---|
| 13 | * documentation and/or other materials provided with the distribution. |
|---|
| 14 | * 4. Neither the name of the University nor the names of its contributors |
|---|
| 15 | * may be used to endorse or promote products derived from this software |
|---|
| 16 | * without specific prior written permission. |
|---|
| 17 | * |
|---|
| 18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
|---|
| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|---|
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|---|
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
|---|
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|---|
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
|---|
| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|---|
| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|---|
| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|---|
| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
|---|
| 28 | * SUCH DAMAGE. |
|---|
| 29 | */ |
|---|
| 30 | |
|---|
| 31 | #include "ttyname.h" |
|---|
| 32 | |
|---|
| 33 | #include <sys/types.h> |
|---|
| 34 | #include <sys/stat.h> |
|---|
| 35 | #include <fcntl.h> |
|---|
| 36 | #include <dirent.h> |
|---|
| 37 | #include <unistd.h> |
|---|
| 38 | #include <string.h> |
|---|
| 39 | #include <paths.h> |
|---|
| 40 | #include <_syslist.h> |
|---|
| 41 | #include <errno.h> |
|---|
| 42 | |
|---|
| 43 | /* |
|---|
| 44 | * ttyname_r() - POSIX 1003.1b 4.7.2 - Determine Terminal Device Name |
|---|
| 45 | */ |
|---|
| 46 | int |
|---|
| 47 | ttyname_r (int fd, |
|---|
| 48 | char *name, |
|---|
| 49 | size_t namesize) |
|---|
| 50 | { |
|---|
| 51 | struct stat sb; |
|---|
| 52 | struct dirent *dirp; |
|---|
| 53 | DIR *dp; |
|---|
| 54 | struct stat dsb; |
|---|
| 55 | char buf[TTYNAME_BUFSIZE]; |
|---|
| 56 | |
|---|
| 57 | /* Must be a terminal. */ |
|---|
| 58 | if (!isatty(fd)) |
|---|
| 59 | return ENOTTY; |
|---|
| 60 | |
|---|
| 61 | /* Must be a character device. */ |
|---|
| 62 | if (fstat (fd, &sb) || !S_ISCHR (sb.st_mode)) |
|---|
| 63 | return ENOTTY; |
|---|
| 64 | |
|---|
| 65 | if ((dp = opendir (_PATH_DEV)) == NULL) |
|---|
| 66 | return EBADF; |
|---|
| 67 | |
|---|
| 68 | strcpy(buf, _PATH_DEV); |
|---|
| 69 | while ((dirp = readdir (dp)) != NULL) |
|---|
| 70 | { |
|---|
| 71 | if (dirp->d_ino != sb.st_ino) |
|---|
| 72 | continue; |
|---|
| 73 | strcpy (buf + sizeof (_PATH_DEV) - 1, dirp->d_name); |
|---|
| 74 | if (stat (buf, &dsb) || sb.st_dev != dsb.st_dev || |
|---|
| 75 | sb.st_ino != dsb.st_ino) |
|---|
| 76 | continue; |
|---|
| 77 | (void) closedir (dp); |
|---|
| 78 | if(strlen(buf) < namesize) /* < to account for terminating null */ |
|---|
| 79 | { |
|---|
| 80 | strcpy(name, buf); |
|---|
| 81 | return 0; |
|---|
| 82 | } |
|---|
| 83 | else |
|---|
| 84 | { |
|---|
| 85 | return ERANGE; |
|---|
| 86 | } |
|---|
| 87 | } |
|---|
| 88 | (void) closedir (dp); |
|---|
| 89 | return EBADF; |
|---|
| 90 | } |
|---|
| 91 | |
|---|
| 92 | #endif /* !_NO_TTYNAME */ |
|---|
