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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
47707456 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
47707456 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the 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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <limits.h> | |
20 | #include <stddef.h> | |
21 | #include <dirent.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/stat.h> | |
24 | #include <unistd.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
b8fd5502 | 28 | char *__ttyname; |
28f540f4 | 29 | |
b8fd5502 UD |
30 | static char *getttyname (int fd, dev_t mydev, ino_t myino, |
31 | int save, int *dostat) internal_function; | |
32 | ||
33 | ||
c877418f | 34 | libc_freeres_ptr (static char *getttyname_name); |
af69217f UD |
35 | |
36 | static char * | |
37 | internal_function | |
bd2260a2 | 38 | getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat) |
28f540f4 | 39 | { |
c4029823 | 40 | static const char dev[] = "/dev"; |
b8fd5502 | 41 | static size_t namelen; |
28f540f4 | 42 | struct stat st; |
28f540f4 | 43 | DIR *dirstream; |
10dc2a90 | 44 | struct dirent *d; |
28f540f4 | 45 | |
50304ef0 | 46 | dirstream = __opendir (dev); |
28f540f4 | 47 | if (dirstream == NULL) |
af69217f UD |
48 | { |
49 | *dostat = -1; | |
50 | return NULL; | |
51 | } | |
28f540f4 | 52 | |
50304ef0 | 53 | while ((d = __readdir (dirstream)) != NULL) |
da2d1bc5 UD |
54 | if (((ino_t) d->d_fileno == myino || *dostat) |
55 | && strcmp (d->d_name, "stdin") | |
56 | && strcmp (d->d_name, "stdout") | |
57 | && strcmp (d->d_name, "stderr")) | |
28f540f4 | 58 | { |
92777700 RM |
59 | size_t dlen = _D_ALLOC_NAMLEN (d); |
60 | if (sizeof (dev) + dlen > namelen) | |
28f540f4 | 61 | { |
b8fd5502 | 62 | free (getttyname_name); |
92777700 | 63 | namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */ |
b8fd5502 UD |
64 | getttyname_name = malloc (namelen); |
65 | if (! getttyname_name) | |
10dc2a90 | 66 | { |
af69217f | 67 | *dostat = -1; |
10dc2a90 | 68 | /* Perhaps it helps to free the directory stream buffer. */ |
50304ef0 | 69 | (void) __closedir (dirstream); |
10dc2a90 UD |
70 | return NULL; |
71 | } | |
b8fd5502 UD |
72 | *((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1)) |
73 | = '/'; | |
28f540f4 | 74 | } |
b8fd5502 UD |
75 | (void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen); |
76 | if (stat (getttyname_name, &st) == 0 | |
af69217f UD |
77 | #ifdef _STATBUF_ST_RDEV |
78 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
79 | #else | |
80 | && (ino_t) d->d_fileno == myino && st.st_dev == mydev | |
81 | #endif | |
82 | ) | |
28f540f4 | 83 | { |
50304ef0 | 84 | (void) __closedir (dirstream); |
b8fd5502 | 85 | __ttyname = getttyname_name; |
c4029823 | 86 | __set_errno (save); |
b8fd5502 | 87 | return getttyname_name; |
28f540f4 RM |
88 | } |
89 | } | |
90 | ||
50304ef0 | 91 | (void) __closedir (dirstream); |
c4029823 | 92 | __set_errno (save); |
28f540f4 RM |
93 | return NULL; |
94 | } | |
af69217f UD |
95 | |
96 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
97 | The returned storage is good only until the next call to this function. */ | |
98 | char * | |
bd2260a2 | 99 | ttyname (int fd) |
af69217f UD |
100 | { |
101 | struct stat st; | |
102 | int dostat = 0; | |
103 | char *name; | |
104 | int save = errno; | |
105 | ||
106 | if (!__isatty (fd)) | |
107 | return NULL; | |
108 | ||
109 | if (fstat (fd, &st) < 0) | |
110 | return NULL; | |
111 | ||
112 | #ifdef _STATBUF_ST_RDEV | |
113 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
114 | #else | |
115 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
116 | #endif | |
117 | ||
118 | if (!name && dostat != -1) | |
119 | { | |
120 | dostat = 1; | |
121 | #ifdef _STATBUF_ST_RDEV | |
122 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
123 | #else | |
124 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
125 | #endif | |
126 | } | |
127 | ||
128 | return name; | |
129 | } |