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04277e02 | 1 | /* Copyright (C) 1991-2019 Free Software Foundation, Inc. |
47707456 | 2 | This file is part of the GNU C Library. |
60478656 | 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. | |
60478656 | 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. |
60478656 | 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/>. */ | |
60478656 RM |
17 | |
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 | ||
28 | #ifndef MIN | |
29 | # define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
30 | #endif | |
31 | ||
af69217f UD |
32 | static const char dev[] = "/dev"; |
33 | ||
79937577 UD |
34 | static int getttyname_r (int fd, char *buf, size_t buflen, |
35 | dev_t mydev, ino_t myino, int save, | |
b41bd5bc | 36 | int *dostat) __THROW; |
af69217f UD |
37 | |
38 | static int | |
f63f2bfd JM |
39 | getttyname_r (int fd, char *buf, size_t buflen, dev_t mydev, ino_t myino, |
40 | int save, int *dostat) | |
60478656 | 41 | { |
60478656 | 42 | struct stat st; |
60478656 | 43 | DIR *dirstream; |
10dc2a90 | 44 | struct dirent *d; |
60478656 | 45 | |
50304ef0 | 46 | dirstream = __opendir (dev); |
60478656 | 47 | if (dirstream == NULL) |
af69217f UD |
48 | { |
49 | *dostat = -1; | |
50 | return errno; | |
51 | } | |
60478656 | 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")) | |
60478656 RM |
58 | { |
59 | char *cp; | |
ba1ffaa1 UD |
60 | size_t needed = _D_EXACT_NAMLEN (d) + 1; |
61 | ||
62 | if (needed > buflen) | |
63 | { | |
af69217f | 64 | *dostat = -1; |
50304ef0 | 65 | (void) __closedir (dirstream); |
ba1ffaa1 UD |
66 | __set_errno (ERANGE); |
67 | return ERANGE; | |
68 | } | |
60478656 | 69 | |
ba1ffaa1 | 70 | cp = __stpncpy (&buf[sizeof (dev)], d->d_name, needed); |
60478656 RM |
71 | cp[0] = '\0'; |
72 | ||
af69217f UD |
73 | if (stat (buf, &st) == 0 |
74 | #ifdef _STATBUF_ST_RDEV | |
75 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
76 | #else | |
77 | && (ino_t) d->d_fileno == myino && st.st_dev == mydev | |
78 | #endif | |
79 | ) | |
60478656 | 80 | { |
50304ef0 | 81 | (void) __closedir (dirstream); |
c4029823 | 82 | __set_errno (save); |
60478656 RM |
83 | return 0; |
84 | } | |
85 | } | |
86 | ||
50304ef0 | 87 | (void) __closedir (dirstream); |
c4029823 | 88 | __set_errno (save); |
ba1ffaa1 UD |
89 | /* It is not clear what to return in this case. `isatty' says FD |
90 | refers to a TTY but no entry in /dev has this inode. */ | |
91 | return ENOTTY; | |
60478656 | 92 | } |
af69217f UD |
93 | |
94 | /* Store at most BUFLEN character of the pathname of the terminal FD is | |
95 | open on in BUF. Return 0 on success, otherwise an error number. */ | |
96 | int | |
bd2260a2 | 97 | __ttyname_r (int fd, char *buf, size_t buflen) |
af69217f UD |
98 | { |
99 | struct stat st; | |
100 | int dostat = 0; | |
101 | int save = errno; | |
102 | int ret; | |
103 | ||
104 | /* Test for the absolute minimal size. This makes life easier inside | |
105 | the loop. */ | |
106 | if (!buf) | |
107 | { | |
108 | __set_errno (EINVAL); | |
109 | return EINVAL; | |
110 | } | |
111 | ||
112 | if (buflen < (int) (sizeof (dev) + 1)) | |
113 | { | |
114 | __set_errno (ERANGE); | |
115 | return ERANGE; | |
116 | } | |
117 | ||
118 | if (!__isatty (fd)) | |
119 | { | |
120 | __set_errno (ENOTTY); | |
121 | return ENOTTY; | |
122 | } | |
123 | ||
124 | if (fstat (fd, &st) < 0) | |
125 | return errno; | |
126 | ||
127 | /* Prepare the result buffer. */ | |
128 | memcpy (buf, dev, sizeof (dev) - 1); | |
129 | buf[sizeof (dev) - 1] = '/'; | |
130 | buflen -= sizeof (dev); | |
131 | ||
132 | #ifdef _STATBUF_ST_RDEV | |
133 | ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save, | |
134 | &dostat); | |
135 | #else | |
136 | ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save, | |
137 | &dostat); | |
138 | #endif | |
139 | ||
140 | if (ret && dostat != -1) | |
141 | { | |
142 | dostat = 1; | |
143 | #ifdef _STATBUF_ST_RDEV | |
144 | ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, | |
145 | save, &dostat); | |
146 | #else | |
147 | ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, | |
148 | save, &dostat); | |
149 | #endif | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
23396375 | 155 | weak_alias (__ttyname_r, ttyname_r) |