[444] | 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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