1 | /* |
2 | * Copyright (c) 1997-2013 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Copyright (c) 1982, 1986, 1989, 1993 |
30 | * The Regents of the University of California. All rights reserved. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice, this list of conditions and the following disclaimer. |
37 | * 2. Redistributions in binary form must reproduce the above copyright |
38 | * notice, this list of conditions and the following disclaimer in the |
39 | * documentation and/or other materials provided with the distribution. |
40 | * 3. All advertising materials mentioning features or use of this software |
41 | * must display the following acknowledgement: |
42 | * This product includes software developed by the University of |
43 | * California, Berkeley and its contributors. |
44 | * 4. Neither the name of the University nor the names of its contributors |
45 | * may be used to endorse or promote products derived from this software |
46 | * without specific prior written permission. |
47 | * |
48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
58 | * SUCH DAMAGE. |
59 | * |
60 | * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 |
61 | */ |
62 | |
63 | /* |
64 | * Pseudo-teletype Driver |
65 | * (Actually two drivers, requiring two entries in 'cdevsw') |
66 | */ |
67 | #include "pty.h" /* XXX */ |
68 | |
69 | #include <sys/param.h> |
70 | #include <sys/systm.h> |
71 | #include <sys/ioctl.h> |
72 | #include <sys/proc_internal.h> |
73 | #include <sys/kauth.h> |
74 | #include <sys/tty.h> |
75 | #include <sys/conf.h> |
76 | #include <sys/file_internal.h> |
77 | #include <sys/uio_internal.h> |
78 | #include <sys/kernel.h> |
79 | #include <sys/vnode.h> |
80 | #include <sys/user.h> |
81 | #include <sys/signalvar.h> |
82 | |
83 | #if CONFIG_MACF |
84 | #include <security/mac_framework.h> |
85 | #endif |
86 | |
87 | #include "tty_dev.h" |
88 | |
89 | #if NPTY == 1 |
90 | #undef NPTY |
91 | #define NPTY 32 /* crude XXX */ |
92 | #warning You have only one pty defined, redefining to 32. |
93 | #endif |
94 | |
95 | /* |
96 | * pts == /dev/tty[pqrsPQRS][0-9a-v] |
97 | * ptc == /dev/pty[pqrsPQRS][0-9a-v] |
98 | */ |
99 | static struct ptmx_ioctl pt_ioctl[NPTY]; |
100 | |
101 | int pty_init(int n_ptys); |
102 | |
103 | #ifndef DEVFS |
104 | int |
105 | pty_init(__unused int n_ptys) |
106 | { |
107 | return 0; |
108 | } |
109 | #else // DEVFS |
110 | #include <miscfs/devfs/devfs.h> |
111 | #define START_CHAR 'p' |
112 | #define HEX_BASE 16 |
113 | |
114 | static struct tty_dev_t _pty_driver; |
115 | |
116 | static struct ptmx_ioctl * |
117 | pty_get_ioctl(int minor, int open_flag) |
118 | { |
119 | if (minor >= NPTY) { |
120 | return NULL; |
121 | } |
122 | struct ptmx_ioctl *pti = &pt_ioctl[minor]; |
123 | if (open_flag & (PF_OPEN_M | PF_OPEN_S)) { |
124 | if (!pti->pt_tty) { |
125 | pti->pt_tty = ttymalloc(); |
126 | } |
127 | if (!pti->pt_tty) { |
128 | return NULL; |
129 | } |
130 | } |
131 | return pti; |
132 | } |
133 | |
134 | static int |
135 | pty_get_name(int minor, char *buffer, size_t size) |
136 | { |
137 | return snprintf(buffer, count: size, "/dev/tty%c%x" , |
138 | START_CHAR + (minor / HEX_BASE), |
139 | minor % HEX_BASE); |
140 | } |
141 | |
142 | int |
143 | pty_init(int n_ptys) |
144 | { |
145 | int i; |
146 | int j; |
147 | |
148 | n_ptys = min(a: n_ptys, NPTY); /* clamp to avoid pt_ioctl overflow */ |
149 | |
150 | /* create the pseudo tty device nodes */ |
151 | for (j = 0; j < 10; j++) { |
152 | for (i = 0; i < HEX_BASE; i++) { |
153 | int m = j * HEX_BASE + i; |
154 | if (m >= n_ptys) { |
155 | goto done; |
156 | } |
157 | pt_ioctl[m].pt_devhandle = devfs_make_node(makedev(PTS_MAJOR, m), |
158 | DEVFS_CHAR, UID_ROOT, GID_WHEEL, perms: 0666, |
159 | fmt: "tty%c%x" , j + START_CHAR, i); |
160 | (void)devfs_make_node(makedev(PTC_MAJOR, m), |
161 | DEVFS_CHAR, UID_ROOT, GID_WHEEL, perms: 0666, |
162 | fmt: "pty%c%x" , j + START_CHAR, i); |
163 | } |
164 | } |
165 | |
166 | done: |
167 | _pty_driver.primary = PTC_MAJOR; |
168 | _pty_driver.replica = PTS_MAJOR; |
169 | _pty_driver.open_reset = 1; |
170 | _pty_driver.open = &pty_get_ioctl; |
171 | _pty_driver.name = &pty_get_name; |
172 | tty_dev_register(dev: &_pty_driver); |
173 | |
174 | if (cdevsw_setkqueueok(PTC_MAJOR, &cdevsw[PTC_MAJOR], CDEVSW_IS_PTC) == -1) { |
175 | panic("Can't mark ptc as kqueue ok" ); |
176 | } |
177 | if (cdevsw_setkqueueok(PTS_MAJOR, &cdevsw[PTS_MAJOR], CDEVSW_IS_PTS) == -1) { |
178 | panic("Can't mark pts as kqueue ok" ); |
179 | } |
180 | return 0; |
181 | } |
182 | #endif // DEVFS |
183 | |