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