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15637ed4 RG |
1 | /* |
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 <sgtty.h> | |
43 | #include <db.h> | |
44 | #include <unistd.h> | |
45 | #include <paths.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 sgttyb ttyb; | |
55 | DB *db; | |
56 | DBT data, key; | |
57 | struct { | |
58 | mode_t type; | |
59 | dev_t dev; | |
60 | } bkey; | |
61 | static char *__oldttyname(); | |
62 | ||
63 | /* Must be a terminal. */ | |
64 | if (ioctl(fd, TIOCGETP, &ttyb) < 0) | |
65 | return(NULL); | |
66 | /* Must be a character device. */ | |
67 | if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode)) | |
68 | return(NULL); | |
69 | ||
28e48405 | 70 | if (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) { |
15637ed4 RG |
71 | bkey.type = S_IFCHR; |
72 | bkey.dev = sb.st_rdev; | |
73 | key.data = &bkey; | |
74 | key.size = sizeof(bkey); | |
75 | if (!(db->get)(db, &key, &data, 0)) { | |
76 | bcopy(data.data, | |
77 | buf + sizeof(_PATH_DEV) - 1, data.size); | |
78 | return(buf); | |
79 | } | |
80 | } | |
81 | return(__oldttyname(fd, &sb)); | |
82 | } | |
83 | ||
84 | static char * | |
85 | __oldttyname(fd, sb) | |
86 | int fd; | |
87 | struct stat *sb; | |
88 | { | |
89 | register struct dirent *dirp; | |
90 | register DIR *dp; | |
91 | struct stat dsb; | |
92 | char *rval, *strcpy(); | |
93 | ||
94 | if ((dp = opendir(_PATH_DEV)) == NULL) | |
95 | return(NULL); | |
96 | ||
97 | for (rval = NULL; dirp = readdir(dp);) { | |
98 | if (dirp->d_fileno != sb->st_ino) | |
99 | continue; | |
100 | bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1, | |
101 | dirp->d_namlen + 1); | |
102 | if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev || | |
103 | sb->st_ino != dsb.st_ino) | |
104 | continue; | |
105 | rval = buf; | |
106 | break; | |
107 | } | |
108 | (void)closedir(dp); | |
109 | return(rval); | |
110 | } |