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1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. | |
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 | |
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. | |
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 | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
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 <termios.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <stdlib.h> | |
28 | ||
29 | #include <_itoa.h> | |
30 | ||
31 | static int getttyname_r (char *buf, size_t buflen, | |
32 | dev_t mydev, ino64_t myino, int save, | |
33 | int *dostat) internal_function; | |
34 | ||
35 | static int | |
36 | internal_function attribute_compat_text_section | |
37 | getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, | |
38 | int save, int *dostat) | |
39 | { | |
40 | struct stat64 st; | |
41 | DIR *dirstream; | |
42 | struct dirent64 *d; | |
43 | size_t devlen = strlen (buf); | |
44 | ||
45 | dirstream = __opendir (buf); | |
46 | if (dirstream == NULL) | |
47 | { | |
48 | *dostat = -1; | |
49 | return errno; | |
50 | } | |
51 | ||
52 | while ((d = __readdir64 (dirstream)) != NULL) | |
53 | if ((d->d_fileno == myino || *dostat) | |
54 | && strcmp (d->d_name, "stdin") | |
55 | && strcmp (d->d_name, "stdout") | |
56 | && strcmp (d->d_name, "stderr")) | |
57 | { | |
58 | char *cp; | |
59 | size_t needed = _D_EXACT_NAMLEN (d) + 1; | |
60 | ||
61 | if (needed > buflen) | |
62 | { | |
63 | *dostat = -1; | |
64 | (void) __closedir (dirstream); | |
65 | __set_errno (ERANGE); | |
66 | return ERANGE; | |
67 | } | |
68 | ||
69 | cp = __stpncpy (buf + devlen, d->d_name, needed); | |
70 | cp[0] = '\0'; | |
71 | ||
72 | if (__xstat64 (_STAT_VER, buf, &st) == 0 | |
73 | #ifdef _STATBUF_ST_RDEV | |
74 | && S_ISCHR (st.st_mode) && st.st_rdev == mydev | |
75 | #else | |
76 | && d->d_fileno == myino && st.st_dev == mydev | |
77 | #endif | |
78 | ) | |
79 | { | |
80 | (void) __closedir (dirstream); | |
81 | __set_errno (save); | |
82 | return 0; | |
83 | } | |
84 | } | |
85 | ||
86 | (void) __closedir (dirstream); | |
87 | __set_errno (save); | |
88 | /* It is not clear what to return in this case. `isatty' says FD | |
89 | refers to a TTY but no entry in /dev has this inode. */ | |
90 | return ENOTTY; | |
91 | } | |
92 | ||
93 | /* Store at most BUFLEN character of the pathname of the terminal FD is | |
94 | open on in BUF. Return 0 on success, otherwise an error number. */ | |
95 | int | |
96 | __ttyname_r (int fd, char *buf, size_t buflen) | |
97 | { | |
98 | char procname[30]; | |
99 | struct stat64 st, st1; | |
100 | int dostat = 0; | |
101 | int save = errno; | |
102 | ||
103 | /* Test for the absolute minimal size. This makes life easier inside | |
104 | the loop. */ | |
105 | if (!buf) | |
106 | { | |
107 | __set_errno (EINVAL); | |
108 | return EINVAL; | |
109 | } | |
110 | ||
111 | if (buflen < sizeof ("/dev/pts/")) | |
112 | { | |
113 | __set_errno (ERANGE); | |
114 | return ERANGE; | |
115 | } | |
116 | ||
117 | /* isatty check, tcgetattr is used because it sets the correct | |
118 | errno (EBADF resp. ENOTTY) on error. */ | |
119 | struct termios term; | |
120 | if (__glibc_unlikely (__tcgetattr (fd, &term) < 0)) | |
121 | return errno; | |
122 | ||
123 | if (__fxstat64 (_STAT_VER, fd, &st) < 0) | |
124 | return errno; | |
125 | ||
126 | /* We try using the /proc filesystem. */ | |
127 | *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0'; | |
128 | ||
129 | ssize_t ret = __readlink (procname, buf, buflen - 1); | |
130 | if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG)) | |
131 | { | |
132 | __set_errno (ERANGE); | |
133 | return ERANGE; | |
134 | } | |
135 | ||
136 | if (__glibc_likely (ret != -1)) | |
137 | { | |
138 | #define UNREACHABLE_LEN strlen ("(unreachable)") | |
139 | if (ret > UNREACHABLE_LEN | |
140 | && memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0) | |
141 | { | |
142 | memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN); | |
143 | ret -= UNREACHABLE_LEN; | |
144 | } | |
145 | ||
146 | /* readlink need not terminate the string. */ | |
147 | buf[ret] = '\0'; | |
148 | ||
149 | /* Verify readlink result, fall back on iterating through devices. */ | |
150 | if (buf[0] == '/' | |
151 | && __xstat64 (_STAT_VER, buf, &st1) == 0 | |
152 | #ifdef _STATBUF_ST_RDEV | |
153 | && S_ISCHR (st1.st_mode) | |
154 | && st1.st_rdev == st.st_rdev | |
155 | #else | |
156 | && st1.st_ino == st.st_ino | |
157 | && st1.st_dev == st.st_dev | |
158 | #endif | |
159 | ) | |
160 | return 0; | |
161 | } | |
162 | ||
163 | /* Prepare the result buffer. */ | |
164 | memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); | |
165 | buflen -= sizeof ("/dev/pts/") - 1; | |
166 | ||
167 | if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode)) | |
168 | { | |
169 | #ifdef _STATBUF_ST_RDEV | |
170 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, | |
171 | &dostat); | |
172 | #else | |
173 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, | |
174 | &dostat); | |
175 | #endif | |
176 | } | |
177 | else | |
178 | { | |
179 | __set_errno (save); | |
180 | ret = ENOENT; | |
181 | } | |
182 | ||
183 | if (ret && dostat != -1) | |
184 | { | |
185 | buf[sizeof ("/dev/") - 1] = '\0'; | |
186 | buflen += sizeof ("pts/") - 1; | |
187 | #ifdef _STATBUF_ST_RDEV | |
188 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, | |
189 | &dostat); | |
190 | #else | |
191 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, | |
192 | &dostat); | |
193 | #endif | |
194 | } | |
195 | ||
196 | if (ret && dostat != -1) | |
197 | { | |
198 | buf[sizeof ("/dev/") - 1] = '\0'; | |
199 | dostat = 1; | |
200 | #ifdef _STATBUF_ST_RDEV | |
201 | ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, | |
202 | save, &dostat); | |
203 | #else | |
204 | ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, | |
205 | save, &dostat); | |
206 | #endif | |
207 | } | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | weak_alias (__ttyname_r, ttyname_r) |