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b168057a | 1 | /* Copyright (C) 1998-2015 Free Software Foundation, Inc. |
6591c335 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6591c335 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6591c335 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
6591c335 | 18 | |
9b3c7c3c UD |
19 | #include <errno.h> |
20 | #include <paths.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
6591c335 UD |
23 | #include <sys/ioctl.h> |
24 | #include <sys/stat.h> | |
9b3c7c3c | 25 | #include <sys/sysmacros.h> |
6591c335 | 26 | #include <termios.h> |
4bca4c17 | 27 | #include <unistd.h> |
6591c335 | 28 | |
eb96ffb0 | 29 | #include <_itoa.h> |
6591c335 | 30 | |
2a947279 UD |
31 | /* Check if DEV corresponds to a master pseudo terminal device. */ |
32 | #define MASTER_P(Dev) \ | |
33 | (major ((Dev)) == 2 \ | |
34 | || (major ((Dev)) == 4 && minor ((Dev)) >= 128 && minor ((Dev)) < 192) \ | |
35 | || (major ((Dev)) >= 128 && major ((Dev)) < 136)) | |
36 | ||
a1f8ec97 | 37 | /* Check if DEV corresponds to a slave pseudo terminal device. */ |
2a947279 UD |
38 | #define SLAVE_P(Dev) \ |
39 | (major ((Dev)) == 3 \ | |
40 | || (major ((Dev)) == 4 && minor ((Dev)) >= 192 && minor ((Dev)) < 256) \ | |
41 | || (major ((Dev)) >= 136 && major ((Dev)) < 144)) | |
42 | ||
43 | /* Note that major number 4 corresponds to the old BSD style pseudo | |
44 | terminal devices. As of Linux 2.1.115 these are no longer | |
45 | supported. They have been replaced by major numbers 2 (masters) | |
46 | and 3 (slaves). */ | |
8edf6e0d | 47 | |
9b3c7c3c UD |
48 | /* Directory where we can find the slave pty nodes. */ |
49 | #define _PATH_DEVPTS "/dev/pts/" | |
6591c335 | 50 | |
9b3c7c3c | 51 | /* The are declared in getpt.c. */ |
ab26a24a UD |
52 | extern const char __libc_ptyname1[] attribute_hidden; |
53 | extern const char __libc_ptyname2[] attribute_hidden; | |
6591c335 | 54 | |
9b3c7c3c UD |
55 | /* Static buffer for `ptsname'. */ |
56 | static char buffer[sizeof (_PATH_DEVPTS) + 20]; | |
57 | ||
58 | ||
6f65e668 | 59 | /* Return the pathname of the pseudo terminal slave associated with |
9b3c7c3c UD |
60 | the master FD is open on, or NULL on errors. |
61 | The returned storage is good until the next call to this function. */ | |
6591c335 | 62 | char * |
9b3c7c3c | 63 | ptsname (int fd) |
6591c335 | 64 | { |
9b3c7c3c | 65 | return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer; |
6591c335 UD |
66 | } |
67 | ||
9b3c7c3c | 68 | |
4bca4c17 | 69 | int |
aa989023 | 70 | __ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp) |
6591c335 | 71 | { |
9b3c7c3c | 72 | int save_errno = errno; |
57b36a0a | 73 | unsigned int ptyno; |
e7c5513d | 74 | |
9b3c7c3c | 75 | if (buf == NULL) |
4bca4c17 UD |
76 | { |
77 | __set_errno (EINVAL); | |
78 | return EINVAL; | |
79 | } | |
80 | ||
81 | if (!__isatty (fd)) | |
82 | { | |
83 | __set_errno (ENOTTY); | |
84 | return ENOTTY; | |
85 | } | |
86 | ||
87 | #ifdef TIOCGPTN | |
9b3c7c3c | 88 | if (__ioctl (fd, TIOCGPTN, &ptyno) == 0) |
6591c335 | 89 | { |
9b3c7c3c | 90 | /* Buffer we use to print the number in. For a maximum size for |
aa989023 | 91 | `int' of 8 bytes we never need more than 20 digits. */ |
9b3c7c3c UD |
92 | char numbuf[21]; |
93 | const char *devpts = _PATH_DEVPTS; | |
814fc245 | 94 | const size_t devptslen = strlen (_PATH_DEVPTS); |
9b3c7c3c UD |
95 | char *p; |
96 | ||
814fc245 UD |
97 | numbuf[sizeof (numbuf) - 1] = '\0'; |
98 | p = _itoa_word (ptyno, &numbuf[sizeof (numbuf) - 1], 10, 0); | |
9b3c7c3c | 99 | |
57b36a0a | 100 | if (buflen < devptslen + (&numbuf[sizeof (numbuf)] - p)) |
6591c335 | 101 | { |
9b3c7c3c UD |
102 | __set_errno (ERANGE); |
103 | return ERANGE; | |
6591c335 | 104 | } |
6591c335 | 105 | |
814fc245 | 106 | memcpy (__stpcpy (buf, devpts), p, &numbuf[sizeof (numbuf)] - p); |
9b3c7c3c | 107 | } |
d0583c40 AJ |
108 | else if (errno != EINVAL) |
109 | return errno; | |
110 | else | |
6591c335 | 111 | #endif |
4bca4c17 | 112 | { |
9b3c7c3c | 113 | char *p; |
e7c5513d | 114 | |
9b3c7c3c UD |
115 | if (buflen < strlen (_PATH_TTY) + 3) |
116 | { | |
117 | __set_errno (ERANGE); | |
118 | return ERANGE; | |
119 | } | |
4bca4c17 | 120 | |
aa989023 | 121 | if (__fxstat64 (_STAT_VER, fd, stp) < 0) |
4bca4c17 | 122 | return errno; |
4bca4c17 | 123 | |
2a947279 | 124 | /* Check if FD really is a master pseudo terminal. */ |
aa989023 | 125 | if (! MASTER_P (stp->st_rdev)) |
2a947279 UD |
126 | { |
127 | __set_errno (ENOTTY); | |
128 | return ENOTTY; | |
129 | } | |
130 | ||
aa989023 | 131 | ptyno = minor (stp->st_rdev); |
4bca4c17 | 132 | |
9b3c7c3c UD |
133 | if (ptyno / 16 >= strlen (__libc_ptyname1)) |
134 | { | |
135 | __set_errno (ENOTTY); | |
136 | return ENOTTY; | |
137 | } | |
e7c5513d | 138 | |
9b3c7c3c UD |
139 | p = __stpcpy (buf, _PATH_TTY); |
140 | p[0] = __libc_ptyname1[ptyno / 16]; | |
141 | p[1] = __libc_ptyname2[ptyno % 16]; | |
142 | p[2] = '\0'; | |
143 | } | |
e7c5513d | 144 | |
aa989023 | 145 | if (__xstat64 (_STAT_VER, buf, stp) < 0) |
9b3c7c3c | 146 | return errno; |
4bca4c17 | 147 | |
2a947279 UD |
148 | /* Check if the name we're about to return really corresponds to a |
149 | slave pseudo terminal. */ | |
aa989023 | 150 | if (! S_ISCHR (stp->st_mode) || ! SLAVE_P (stp->st_rdev)) |
2a947279 UD |
151 | { |
152 | /* This really is a configuration problem. */ | |
153 | __set_errno (ENOTTY); | |
154 | return ENOTTY; | |
155 | } | |
156 | ||
9b3c7c3c | 157 | __set_errno (save_errno); |
4bca4c17 | 158 | return 0; |
6591c335 | 159 | } |
aa989023 UD |
160 | |
161 | ||
162 | /* Store at most BUFLEN characters of the pathname of the slave pseudo | |
163 | terminal associated with the master FD is open on in BUF. | |
164 | Return 0 on success, otherwise an error number. */ | |
165 | int | |
166 | __ptsname_r (int fd, char *buf, size_t buflen) | |
167 | { | |
168 | struct stat64 st; | |
169 | return __ptsname_internal (fd, buf, buflen, &st); | |
170 | } | |
6591c335 | 171 | weak_alias (__ptsname_r, ptsname_r) |