]>
Commit | Line | Data |
---|---|---|
d614a753 | 1 | /* Copyright (C) 1991-2020 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://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 | 30 | static char *getttyname (int fd, dev_t mydev, ino_t myino, |
b41bd5bc | 31 | int save, int *dostat); |
b8fd5502 UD |
32 | |
33 | ||
c877418f | 34 | libc_freeres_ptr (static char *getttyname_name); |
af69217f UD |
35 | |
36 | static char * | |
bd2260a2 | 37 | getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat) |
28f540f4 | 38 | { |
c4029823 | 39 | static const char dev[] = "/dev"; |
b8fd5502 | 40 | static size_t namelen; |
28f540f4 | 41 | struct stat st; |
28f540f4 | 42 | DIR *dirstream; |
10dc2a90 | 43 | struct dirent *d; |
28f540f4 | 44 | |
50304ef0 | 45 | dirstream = __opendir (dev); |
28f540f4 | 46 | if (dirstream == NULL) |
af69217f UD |
47 | { |
48 | *dostat = -1; | |
49 | return NULL; | |
50 | } | |
28f540f4 | 51 | |
50304ef0 | 52 | while ((d = __readdir (dirstream)) != NULL) |
da2d1bc5 UD |
53 | if (((ino_t) d->d_fileno == myino || *dostat) |
54 | && strcmp (d->d_name, "stdin") | |
55 | && strcmp (d->d_name, "stdout") | |
56 | && strcmp (d->d_name, "stderr")) | |
28f540f4 | 57 | { |
92777700 RM |
58 | size_t dlen = _D_ALLOC_NAMLEN (d); |
59 | if (sizeof (dev) + dlen > namelen) | |
28f540f4 | 60 | { |
b8fd5502 | 61 | free (getttyname_name); |
92777700 | 62 | namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */ |
b8fd5502 UD |
63 | getttyname_name = malloc (namelen); |
64 | if (! getttyname_name) | |
10dc2a90 | 65 | { |
af69217f | 66 | *dostat = -1; |
10dc2a90 | 67 | /* Perhaps it helps to free the directory stream buffer. */ |
50304ef0 | 68 | (void) __closedir (dirstream); |
10dc2a90 UD |
69 | return NULL; |
70 | } | |
b8fd5502 UD |
71 | *((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1)) |
72 | = '/'; | |
28f540f4 | 73 | } |
b8fd5502 UD |
74 | (void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen); |
75 | if (stat (getttyname_name, &st) == 0 | |
af69217f UD |
76 | #ifdef _STATBUF_ST_RDEV |
77 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
78 | #else | |
79 | && (ino_t) d->d_fileno == myino && st.st_dev == mydev | |
80 | #endif | |
81 | ) | |
28f540f4 | 82 | { |
50304ef0 | 83 | (void) __closedir (dirstream); |
b8fd5502 | 84 | __ttyname = getttyname_name; |
c4029823 | 85 | __set_errno (save); |
b8fd5502 | 86 | return getttyname_name; |
28f540f4 RM |
87 | } |
88 | } | |
89 | ||
50304ef0 | 90 | (void) __closedir (dirstream); |
c4029823 | 91 | __set_errno (save); |
28f540f4 RM |
92 | return NULL; |
93 | } | |
af69217f UD |
94 | |
95 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
96 | The returned storage is good only until the next call to this function. */ | |
97 | char * | |
bd2260a2 | 98 | ttyname (int fd) |
af69217f UD |
99 | { |
100 | struct stat st; | |
101 | int dostat = 0; | |
102 | char *name; | |
103 | int save = errno; | |
104 | ||
105 | if (!__isatty (fd)) | |
106 | return NULL; | |
107 | ||
108 | if (fstat (fd, &st) < 0) | |
109 | return NULL; | |
110 | ||
111 | #ifdef _STATBUF_ST_RDEV | |
112 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
113 | #else | |
114 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
115 | #endif | |
116 | ||
117 | if (!name && dostat != -1) | |
118 | { | |
119 | dostat = 1; | |
120 | #ifdef _STATBUF_ST_RDEV | |
121 | name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); | |
122 | #else | |
123 | name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); | |
124 | #endif | |
125 | } | |
126 | ||
127 | return name; | |
128 | } |