1 | /* |
2 | * Copyright (c) 1997-2006 Apple Computer, 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, 1991, 1993 |
30 | * The Regents of the University of California. All rights reserved. |
31 | * (c) UNIX System Laboratories, Inc. |
32 | * All or some portions of this file are derived from material licensed |
33 | * to the University of California by American Telephone and Telegraph |
34 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
35 | * the permission of UNIX System Laboratories, Inc. |
36 | * |
37 | * Redistribution and use in source and binary forms, with or without |
38 | * modification, are permitted provided that the following conditions |
39 | * are met: |
40 | * 1. Redistributions of source code must retain the above copyright |
41 | * notice, this list of conditions and the following disclaimer. |
42 | * 2. Redistributions in binary form must reproduce the above copyright |
43 | * notice, this list of conditions and the following disclaimer in the |
44 | * documentation and/or other materials provided with the distribution. |
45 | * 3. All advertising materials mentioning features or use of this software |
46 | * must display the following acknowledgement: |
47 | * This product includes software developed by the University of |
48 | * California, Berkeley and its contributors. |
49 | * 4. Neither the name of the University nor the names of its contributors |
50 | * may be used to endorse or promote products derived from this software |
51 | * without specific prior written permission. |
52 | * |
53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
63 | * SUCH DAMAGE. |
64 | * |
65 | * @(#)tty_conf.c 8.4 (Berkeley) 1/21/94 |
66 | */ |
67 | |
68 | #include <sys/param.h> |
69 | #include <sys/systm.h> |
70 | #include <sys/tty.h> |
71 | #include <sys/conf.h> |
72 | |
73 | #ifndef MAXLDISC |
74 | #define MAXLDISC 8 |
75 | #endif |
76 | |
77 | #define l_nodev (void (*)(void))&enodev |
78 | |
79 | #define l_noopen ((l_open_t *) l_nodev) |
80 | #define l_noclose ((l_close_t *) l_nodev) |
81 | #define l_noread ((l_read_t *) l_nodev) |
82 | #define l_nowrite ((l_write_t *) l_nodev) |
83 | #define l_norint ((l_rint_t *) l_nodev) |
84 | |
85 | static l_ioctl_t l_noioctl; |
86 | static l_start_t l_nostart; |
87 | |
88 | /* |
89 | * XXX it probably doesn't matter what the entries other than the l_open |
90 | * entry are here. The l_noioctl and ttymodem entries still look fishy. |
91 | * Reconsider the removal of nullmodem anyway. It was too much like |
92 | * ttymodem, but a completely null version might be useful. |
93 | */ |
94 | #define NODISC(n) \ |
95 | { l_noopen, l_noclose, l_noread, l_nowrite, \ |
96 | l_noioctl, l_norint, l_nostart, ttymodem } |
97 | |
98 | struct linesw linesw[MAXLDISC] = |
99 | { |
100 | /* 0- termios */ |
101 | { ttyopen, ttylclose, ttread, ttwrite, |
102 | l_noioctl, ttyinput, ttwwakeup, ttymodem }, |
103 | NODISC(1), /* 1- defunct */ |
104 | /* 2- NTTYDISC */ |
105 | { .l_open: ttyopen, .l_close: ttylclose, .l_read: ttread, .l_write: ttwrite, |
106 | .l_ioctl: l_noioctl, .l_rint: ttyinput, .l_start: ttwwakeup, .l_modem: ttymodem }, |
107 | NODISC(3), /* TABLDISC */ |
108 | NODISC(4), /* SLIPDISC */ |
109 | NODISC(5), /* PPPDISC */ |
110 | NODISC(6), /* loadable */ |
111 | NODISC(7), /* loadable */ |
112 | }; |
113 | |
114 | const int nlinesw = sizeof(linesw) / sizeof(linesw[0]); |
115 | |
116 | static struct linesw nodisc = NODISC(0); |
117 | |
118 | #define LOADABLE_LDISC 6 |
119 | /* |
120 | * ldisc_register: Register a line discipline. |
121 | * |
122 | * discipline: Index for discipline to load, or LDISC_LOAD for us to choose. |
123 | * linesw_p: Pointer to linesw_p. |
124 | * |
125 | * Returns: Index used or -1 on failure. |
126 | */ |
127 | int |
128 | ldisc_register(int discipline, struct linesw *linesw_p) |
129 | { |
130 | int slot = -1; |
131 | |
132 | if (discipline == LDISC_LOAD) { |
133 | int i; |
134 | for (i = LOADABLE_LDISC; i < MAXLDISC; i++) { |
135 | if (bcmp(s1: linesw + i, s2: &nodisc, n: sizeof(nodisc)) == 0) { |
136 | slot = i; |
137 | } |
138 | } |
139 | } else if (discipline >= 0 && discipline < MAXLDISC) { |
140 | slot = discipline; |
141 | } |
142 | |
143 | if (slot != -1 && linesw_p) { |
144 | linesw[slot] = *linesw_p; |
145 | } |
146 | |
147 | return slot; |
148 | } |
149 | |
150 | /* |
151 | * ldisc_deregister: Deregister a line discipline obtained with |
152 | * ldisc_register. Can only deregister "loadable" ones now. |
153 | * |
154 | * discipline: Index for discipline to unload. |
155 | */ |
156 | void |
157 | ldisc_deregister(int discipline) |
158 | { |
159 | if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) { |
160 | linesw[discipline] = nodisc; |
161 | } |
162 | } |
163 | |
164 | /* |
165 | * Do nothing specific version of line |
166 | * discipline specific ioctl command. |
167 | */ |
168 | static int |
169 | l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data, |
170 | __unused int flags, __unused struct proc *p) |
171 | { |
172 | return ENOTTY; |
173 | } |
174 | |
175 | static void |
176 | l_nostart(__unused struct tty *tp) |
177 | { |
178 | } |
179 | |