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45139d5f UD |
1 | /* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <limits.h> | |
21 | #include <stddef.h> | |
22 | #include <dirent.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <stdlib.h> | |
28 | ||
29 | static int getttyname_r __P ((int fd, char *buf, size_t buflen, | |
30 | dev_t mydev, ino_t myino, int save, | |
31 | int *dostat)) internal_function; | |
32 | ||
33 | static int | |
34 | internal_function | |
35 | getttyname_r (fd, buf, buflen, mydev, myino, save, dostat) | |
36 | int fd; | |
37 | char *buf; | |
38 | size_t buflen; | |
39 | dev_t mydev; | |
40 | ino_t myino; | |
41 | int save; | |
42 | int *dostat; | |
43 | { | |
44 | struct stat st; | |
45 | DIR *dirstream; | |
46 | struct dirent *d; | |
47 | size_t devlen = strlen (buf); | |
48 | ||
50304ef0 | 49 | dirstream = __opendir (buf); |
45139d5f UD |
50 | if (dirstream == NULL) |
51 | { | |
52 | *dostat = -1; | |
53 | return errno; | |
54 | } | |
55 | ||
50304ef0 | 56 | while ((d = __readdir (dirstream)) != NULL) |
45139d5f UD |
57 | if (((ino_t) d->d_fileno == myino || *dostat) |
58 | && strcmp (d->d_name, "stdin") | |
59 | && strcmp (d->d_name, "stdout") | |
60 | && strcmp (d->d_name, "stderr")) | |
61 | { | |
62 | char *cp; | |
63 | size_t needed = _D_EXACT_NAMLEN (d) + 1; | |
64 | ||
65 | if (needed > buflen) | |
66 | { | |
67 | *dostat = -1; | |
50304ef0 | 68 | (void) __closedir (dirstream); |
45139d5f UD |
69 | __set_errno (ERANGE); |
70 | return ERANGE; | |
71 | } | |
72 | ||
73 | cp = __stpncpy (buf + devlen, d->d_name, needed); | |
74 | cp[0] = '\0'; | |
75 | ||
76 | if (stat (buf, &st) == 0 | |
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 | ) | |
83 | { | |
50304ef0 | 84 | (void) __closedir (dirstream); |
45139d5f UD |
85 | __set_errno (save); |
86 | return 0; | |
87 | } | |
88 | } | |
89 | ||
50304ef0 | 90 | (void) __closedir (dirstream); |
45139d5f UD |
91 | __set_errno (save); |
92 | /* It is not clear what to return in this case. `isatty' says FD | |
93 | refers to a TTY but no entry in /dev has this inode. */ | |
94 | return ENOTTY; | |
95 | } | |
96 | ||
97 | /* Store at most BUFLEN character of the pathname of the terminal FD is | |
98 | open on in BUF. Return 0 on success, otherwise an error number. */ | |
99 | int | |
100 | __ttyname_r (fd, buf, buflen) | |
101 | int fd; | |
102 | char *buf; | |
103 | size_t buflen; | |
104 | { | |
105 | struct stat st, st1; | |
106 | int dostat = 0; | |
107 | int save = errno; | |
108 | int ret; | |
109 | ||
110 | /* Test for the absolute minimal size. This makes life easier inside | |
111 | the loop. */ | |
112 | if (!buf) | |
113 | { | |
114 | __set_errno (EINVAL); | |
115 | return EINVAL; | |
116 | } | |
117 | ||
118 | if (buflen < sizeof ("/dev/pts/")) | |
119 | { | |
120 | __set_errno (ERANGE); | |
121 | return ERANGE; | |
122 | } | |
123 | ||
124 | if (!__isatty (fd)) | |
125 | { | |
126 | __set_errno (ENOTTY); | |
127 | return ENOTTY; | |
128 | } | |
129 | ||
130 | if (fstat (fd, &st) < 0) | |
131 | return errno; | |
132 | ||
133 | /* Prepare the result buffer. */ | |
134 | memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); | |
135 | buflen -= sizeof ("/dev/pts/") - 1; | |
136 | ||
137 | if (stat (buf, &st1) == 0 && S_ISDIR (st1.st_mode)) | |
138 | { | |
139 | #ifdef _STATBUF_ST_RDEV | |
140 | ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save, | |
141 | &dostat); | |
142 | #else | |
143 | ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save, | |
144 | &dostat); | |
145 | #endif | |
146 | } | |
147 | else | |
148 | { | |
149 | __set_errno (save); | |
150 | ret = ENOENT; | |
151 | } | |
152 | ||
153 | if (ret && dostat != -1) | |
154 | { | |
155 | buf[sizeof ("/dev/") - 1] = '\0'; | |
156 | buflen += sizeof ("pts/") - 1; | |
157 | #ifdef _STATBUF_ST_RDEV | |
158 | ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save, | |
159 | &dostat); | |
160 | #else | |
161 | ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save, | |
162 | &dostat); | |
163 | #endif | |
164 | } | |
165 | ||
166 | if (ret && dostat != -1) | |
167 | { | |
168 | buf[sizeof ("/dev/") - 1] = '\0'; | |
169 | dostat = 1; | |
170 | #ifdef _STATBUF_ST_RDEV | |
171 | ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, | |
172 | save, &dostat); | |
173 | #else | |
174 | ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, | |
175 | save, &dostat); | |
176 | #endif | |
177 | } | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | weak_alias (__ttyname_r, ttyname_r) |