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
pty_init(__unused int n_ptys)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 *
pty_get_ioctl(int minor,int open_flag)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
pty_get_name(int minor,char * buffer,size_t size)135 pty_get_name(int minor, char *buffer, size_t size)
136 {
137 return snprintf(buffer, size, "/dev/tty%c%x",
138 START_CHAR + (minor / HEX_BASE),
139 minor % HEX_BASE);
140 }
141
142 int
pty_init(int n_ptys)143 pty_init(int n_ptys)
144 {
145 int i;
146 int j;
147
148 n_ptys = min(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, 0666,
159 "tty%c%x", j + START_CHAR, i);
160 (void)devfs_make_node(makedev(PTC_MAJOR, m),
161 DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,
162 "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(&_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