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af69217f | 1 | /* Copyright (C) 1991, 92, 93, 96, 97, 98 Free Software Foundation, Inc. |
47707456 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
47707456 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
47707456 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
47707456 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
28f540f4 RM |
19 | #include <errno.h> |
20 | #include <limits.h> | |
21 | #include <stddef.h> | |
22 | #include <dirent.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <stdlib.h> | |
28 | ||
29 | char *__ttyname = NULL; | |
30 | ||
af69217f UD |
31 | static char * getttyname __P ((int fd, dev_t mydev, ino_t myino, |
32 | int save, int *dostat)) internal_function; | |
33 | ||
34 | static char * | |
35 | internal_function | |
36 | getttyname (fd, mydev, myino, save, dostat) | |
c4029823 | 37 | int fd; |
af69217f UD |
38 | dev_t mydev; |
39 | ino_t myino; | |
40 | int save; | |
41 | int *dostat; | |
28f540f4 | 42 | { |
c4029823 | 43 | static const char dev[] = "/dev"; |
28f540f4 RM |
44 | static char *name; |
45 | static size_t namelen = 0; | |
46 | struct stat st; | |
28f540f4 | 47 | DIR *dirstream; |
10dc2a90 | 48 | struct dirent *d; |
28f540f4 RM |
49 | |
50 | dirstream = opendir (dev); | |
51 | if (dirstream == NULL) | |
af69217f UD |
52 | { |
53 | *dostat = -1; | |
54 | return NULL; | |
55 | } | |
28f540f4 | 56 | |
10dc2a90 | 57 | while ((d = readdir (dirstream)) != NULL) |
da2d1bc5 UD |
58 | if (((ino_t) d->d_fileno == myino || *dostat) |
59 | && strcmp (d->d_name, "stdin") | |
60 | && strcmp (d->d_name, "stdout") | |
61 | && strcmp (d->d_name, "stderr")) | |
28f540f4 | 62 | { |
92777700 RM |
63 | size_t dlen = _D_ALLOC_NAMLEN (d); |
64 | if (sizeof (dev) + dlen > namelen) | |
28f540f4 RM |
65 | { |
66 | free (name); | |
92777700 | 67 | namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */ |
28f540f4 RM |
68 | name = malloc (namelen); |
69 | if (! name) | |
10dc2a90 | 70 | { |
af69217f | 71 | *dostat = -1; |
10dc2a90 UD |
72 | /* Perhaps it helps to free the directory stream buffer. */ |
73 | (void) closedir (dirstream); | |
74 | return NULL; | |
75 | } | |
86187531 | 76 | *((char *) __mempcpy (name, dev, sizeof (dev) - 1)) = '/'; |
28f540f4 | 77 | } |
86187531 | 78 | (void) __mempcpy (&name[sizeof (dev)], d->d_name, dlen); |
af69217f UD |
79 | if (stat (name, &st) == 0 |
80 | #ifdef _STATBUF_ST_RDEV | |
81 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
82 | #else | |
83 | && (ino_t) d->d_fileno == myino && st.st_dev == mydev | |
84 | #endif | |
85 | ) | |
28f540f4 RM |
86 | { |
87 | (void) closedir (dirstream); | |
88 | __ttyname = name; | |
c4029823 | 89 | __set_errno (save); |
28f540f4 RM |
90 | return name; |
91 | } | |
92 | } | |
93 | ||
94 | (void) closedir (dirstream); | |
c4029823 | 95 | __set_errno (save); |
28f540f4 RM |
96 | return NULL; |
97 | } | |
af69217f UD |
98 | |
99 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
100 | The returned storage is good only until the next call to this function. */ | |
101 | char * | |
102 | ttyname (fd) | |
103 | int fd; | |
104 | { | |
105 | struct stat st; | |
106 | int dostat = 0; | |
107 | char *name; | |
108 | int save = errno; | |
109 | ||
110 | if (!__isatty (fd)) | |
111 | return NULL; | |
112 | ||
113 | if (fstat (fd, &st) < 0) | |
114 | return NULL; | |
115 | ||
116 | #ifdef _STATBUF_ST_RDEV | |
117 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
118 | #else | |
119 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
120 | #endif | |
121 | ||
122 | if (!name && dostat != -1) | |
123 | { | |
124 | dostat = 1; | |
125 | #ifdef _STATBUF_ST_RDEV | |
126 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
127 | #else | |
128 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
129 | #endif | |
130 | } | |
131 | ||
132 | return name; | |
133 | } |