1 /*
2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34 #include "namespace.h"
35 #include <sys/types.h>
36 #include <fcntl.h>
37 #include <dirent.h>
38 #include <stdlib.h>
39 #include <termios.h>
40 #include <unistd.h>
41 #include <string.h>
42 #include <paths.h>
43 #include <errno.h>
44 #include <limits.h>
45 #include <machine/stdint.h>
46 #include <sys/stat.h>
47 #include <sys/ioctl.h>
48 #include "reentrant.h"
49 #include "un-namespace.h"
50
51 #include "libc_private.h"
52
53 #define TTYNAME_DEVFS_COMPAT 1
54
55 static char ptsname_buf[sizeof(_PATH_DEV) + NAME_MAX];
56
57 static once_t ptsname_init_once = ONCE_INITIALIZER;
58 static thread_key_t ptsname_key;
59 static int ptsname_keycreated = 0;
60
61 static int
__isptmaster(int fd)62 __isptmaster(int fd)
63 {
64 int error;
65
66 error = _ioctl(fd, TIOCISPTMASTER);
67 if ((error) && (errno != EBADF))
68 errno = EINVAL;
69
70 return error;
71 }
72
73 static void
ptsname_keycreate(void)74 ptsname_keycreate(void)
75 {
76 ptsname_keycreated = (thr_keycreate(&ptsname_key, free) == 0);
77 }
78
79 char *
ptsname(int fd)80 ptsname(int fd)
81 {
82 int error;
83 size_t used;
84 char *buf;
85
86 error = __isptmaster(fd);
87 if (error)
88 return (NULL);
89
90 if (thr_main() != 0)
91 buf = ptsname_buf;
92 else {
93 if (thr_once(&ptsname_init_once, ptsname_keycreate) != 0 ||
94 !ptsname_keycreated)
95 return (NULL);
96 if ((buf = thr_getspecific(ptsname_key)) == NULL) {
97 if ((buf = malloc(sizeof ptsname_buf)) == NULL)
98 return (NULL);
99 if (thr_setspecific(ptsname_key, buf) != 0) {
100 free(buf);
101 return (NULL);
102 }
103 }
104 }
105
106 strcpy(buf, "/dev/");
107 used = strlen(buf);
108
109 if (((error = fdevname_r(fd, buf+used, sizeof(ptsname_buf)-used))) != 0) {
110 errno = error;
111 return (NULL);
112 }
113
114 buf[used+2] = 's';
115
116 return (buf);
117 }
118
119 int
posix_openpt(int oflag)120 posix_openpt(int oflag)
121 {
122 return _open("/dev/ptmx", oflag);
123 }
124
125 int
unlockpt(int fd)126 unlockpt(int fd)
127 {
128 return __isptmaster(fd);
129 }
130
131 int
grantpt(int fd)132 grantpt(int fd)
133 {
134 return __isptmaster(fd);
135 }
136