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ffb7875d | 1 | /* Copyright (C) 1991-2012 Free Software Foundation, Inc. |
45139d5f UD |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
45139d5f UD |
8 | |
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. |
45139d5f | 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/>. */ | |
45139d5f UD |
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> | |
f0d5e1f6 | 24 | #include <termios.h> |
45139d5f UD |
25 | #include <unistd.h> |
26 | #include <string.h> | |
27 | #include <stdlib.h> | |
28 | ||
eb96ffb0 | 29 | #include <_itoa.h> |
f9d07577 | 30 | #include <kernel-features.h> |
c5e340c7 | 31 | |
bcaad6ee | 32 | static int getttyname_r (char *buf, size_t buflen, |
8edf6e0d | 33 | dev_t mydev, ino64_t myino, int save, |
bcaad6ee | 34 | int *dostat) internal_function; |
45139d5f UD |
35 | |
36 | static int | |
f9d07577 | 37 | internal_function attribute_compat_text_section |
8edf6e0d | 38 | getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, |
bcaad6ee | 39 | int save, int *dostat) |
45139d5f | 40 | { |
8edf6e0d | 41 | struct stat64 st; |
45139d5f | 42 | DIR *dirstream; |
2958e6cc | 43 | struct dirent64 *d; |
45139d5f UD |
44 | size_t devlen = strlen (buf); |
45 | ||
50304ef0 | 46 | dirstream = __opendir (buf); |
45139d5f UD |
47 | if (dirstream == NULL) |
48 | { | |
49 | *dostat = -1; | |
50 | return errno; | |
51 | } | |
52 | ||
2958e6cc UD |
53 | while ((d = __readdir64 (dirstream)) != NULL) |
54 | if ((d->d_fileno == myino || *dostat) | |
45139d5f UD |
55 | && strcmp (d->d_name, "stdin") |
56 | && strcmp (d->d_name, "stdout") | |
57 | && strcmp (d->d_name, "stderr")) | |
58 | { | |
59 | char *cp; | |
60 | size_t needed = _D_EXACT_NAMLEN (d) + 1; | |
61 | ||
62 | if (needed > buflen) | |
63 | { | |
64 | *dostat = -1; | |
50304ef0 | 65 | (void) __closedir (dirstream); |
45139d5f UD |
66 | __set_errno (ERANGE); |
67 | return ERANGE; | |
68 | } | |
69 | ||
70 | cp = __stpncpy (buf + devlen, d->d_name, needed); | |
71 | cp[0] = '\0'; | |
72 | ||
8edf6e0d | 73 | if (__xstat64 (_STAT_VER, buf, &st) == 0 |
45139d5f UD |
74 | #ifdef _STATBUF_ST_RDEV |
75 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
76 | #else | |
2958e6cc | 77 | && d->d_fileno == myino && st.st_dev == mydev |
45139d5f UD |
78 | #endif |
79 | ) | |
80 | { | |
50304ef0 | 81 | (void) __closedir (dirstream); |
45139d5f UD |
82 | __set_errno (save); |
83 | return 0; | |
84 | } | |
85 | } | |
86 | ||
50304ef0 | 87 | (void) __closedir (dirstream); |
45139d5f UD |
88 | __set_errno (save); |
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; | |
92 | } | |
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 | |
bcaad6ee | 97 | __ttyname_r (int fd, char *buf, size_t buflen) |
45139d5f | 98 | { |
c5e340c7 | 99 | char procname[30]; |
8edf6e0d | 100 | struct stat64 st, st1; |
45139d5f UD |
101 | int dostat = 0; |
102 | int save = errno; | |
45139d5f UD |
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 < sizeof ("/dev/pts/")) | |
113 | { | |
114 | __set_errno (ERANGE); | |
115 | return ERANGE; | |
116 | } | |
117 | ||
f0d5e1f6 UD |
118 | /* isatty check, tcgetattr is used because it sets the correct |
119 | errno (EBADF resp. ENOTTY) on error. */ | |
120 | struct termios term; | |
121 | if (__builtin_expect (__tcgetattr (fd, &term) < 0, 0)) | |
122 | return errno; | |
f9d07577 | 123 | |
0e516e0e MS |
124 | if (__fxstat64 (_STAT_VER, fd, &st) < 0) |
125 | return errno; | |
126 | ||
2f7dc594 UD |
127 | /* We try using the /proc filesystem. */ |
128 | *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0'; | |
129 | ||
f9d07577 UD |
130 | ssize_t ret = __readlink (procname, buf, buflen - 1); |
131 | if (__builtin_expect (ret == -1 && errno == ENOENT, 0)) | |
2f7dc594 UD |
132 | { |
133 | __set_errno (EBADF); | |
134 | return EBADF; | |
135 | } | |
2f7dc594 | 136 | |
f9d07577 | 137 | if (__builtin_expect (ret == -1 && errno == ENAMETOOLONG, 0)) |
2f7dc594 UD |
138 | { |
139 | __set_errno (ERANGE); | |
140 | return ERANGE; | |
141 | } | |
c5e340c7 | 142 | |
ffb7875d | 143 | if (__builtin_expect (ret != -1, 1)) |
7081e0a3 | 144 | { |
0e516e0e MS |
145 | #define UNREACHABLE_LEN strlen ("(unreachable)") |
146 | if (ret > UNREACHABLE_LEN | |
147 | && memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0) | |
148 | { | |
149 | memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN); | |
150 | ret -= UNREACHABLE_LEN; | |
151 | } | |
152 | ||
153 | /* readlink need not terminate the string. */ | |
7081e0a3 | 154 | buf[ret] = '\0'; |
c5e340c7 | 155 | |
0e516e0e MS |
156 | /* Verify readlink result, fall back on iterating through devices. */ |
157 | if (buf[0] == '/' | |
158 | && __xstat64 (_STAT_VER, buf, &st1) == 0 | |
159 | #ifdef _STATBUF_ST_RDEV | |
160 | && S_ISCHR (st1.st_mode) | |
161 | && st1.st_rdev == st.st_rdev | |
162 | #else | |
163 | && st1.st_ino == st.st_ino | |
164 | && st1.st_dev == st.st_dev | |
165 | #endif | |
166 | ) | |
167 | return 0; | |
168 | } | |
45139d5f UD |
169 | |
170 | /* Prepare the result buffer. */ | |
171 | memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); | |
172 | buflen -= sizeof ("/dev/pts/") - 1; | |
173 | ||
8edf6e0d | 174 | if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode)) |
45139d5f UD |
175 | { |
176 | #ifdef _STATBUF_ST_RDEV | |
7d1de115 UD |
177 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, |
178 | &dostat); | |
45139d5f | 179 | #else |
7d1de115 UD |
180 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, |
181 | &dostat); | |
45139d5f | 182 | #endif |
7d1de115 UD |
183 | } |
184 | else | |
185 | { | |
186 | __set_errno (save); | |
187 | ret = ENOENT; | |
45139d5f UD |
188 | } |
189 | ||
190 | if (ret && dostat != -1) | |
191 | { | |
192 | buf[sizeof ("/dev/") - 1] = '\0'; | |
193 | buflen += sizeof ("pts/") - 1; | |
194 | #ifdef _STATBUF_ST_RDEV | |
160698e2 | 195 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, |
45139d5f UD |
196 | &dostat); |
197 | #else | |
160698e2 | 198 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, |
45139d5f UD |
199 | &dostat); |
200 | #endif | |
201 | } | |
202 | ||
203 | if (ret && dostat != -1) | |
204 | { | |
205 | buf[sizeof ("/dev/") - 1] = '\0'; | |
206 | dostat = 1; | |
207 | #ifdef _STATBUF_ST_RDEV | |
160698e2 | 208 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, |
45139d5f UD |
209 | save, &dostat); |
210 | #else | |
160698e2 | 211 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, |
45139d5f UD |
212 | save, &dostat); |
213 | #endif | |
214 | } | |
215 | ||
216 | return ret; | |
217 | } | |
218 | ||
219 | weak_alias (__ttyname_r, ttyname_r) |