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_noopen ((l_open_t *) &enodev) |
78 | #define l_noclose ((l_close_t *) &enodev) |
79 | #define l_noread ((l_read_t *) &enodev) |
80 | #define l_nowrite ((l_write_t *) &enodev) |
81 | #define l_norint ((l_rint_t *) &enodev) |
82 | |
83 | static l_ioctl_t l_noioctl; |
84 | static l_start_t l_nostart; |
85 | |
86 | /* |
87 | * XXX it probably doesn't matter what the entries other than the l_open |
88 | * entry are here. The l_noioctl and ttymodem entries still look fishy. |
89 | * Reconsider the removal of nullmodem anyway. It was too much like |
90 | * ttymodem, but a completely null version might be useful. |
91 | */ |
92 | #define NODISC(n) \ |
93 | { l_noopen, l_noclose, l_noread, l_nowrite, \ |
94 | l_noioctl, l_norint, l_nostart, ttymodem } |
95 | |
96 | struct linesw linesw[MAXLDISC] = |
97 | { |
98 | /* 0- termios */ |
99 | { ttyopen, ttylclose, ttread, ttwrite, |
100 | l_noioctl, ttyinput, ttwwakeup, ttymodem }, |
101 | NODISC(1), /* 1- defunct */ |
102 | /* 2- NTTYDISC */ |
103 | { ttyopen, ttylclose, ttread, ttwrite, |
104 | l_noioctl, ttyinput, ttwwakeup, ttymodem }, |
105 | NODISC(3), /* TABLDISC */ |
106 | NODISC(4), /* SLIPDISC */ |
107 | NODISC(5), /* PPPDISC */ |
108 | NODISC(6), /* loadable */ |
109 | NODISC(7), /* loadable */ |
110 | }; |
111 | |
112 | const int nlinesw = sizeof (linesw) / sizeof (linesw[0]); |
113 | |
114 | static struct linesw nodisc = NODISC(0); |
115 | |
116 | #define LOADABLE_LDISC 6 |
117 | /* |
118 | * ldisc_register: Register a line discipline. |
119 | * |
120 | * discipline: Index for discipline to load, or LDISC_LOAD for us to choose. |
121 | * linesw_p: Pointer to linesw_p. |
122 | * |
123 | * Returns: Index used or -1 on failure. |
124 | */ |
125 | int |
126 | ldisc_register(int discipline, struct linesw *linesw_p) |
127 | { |
128 | int slot = -1; |
129 | |
130 | if (discipline == LDISC_LOAD) { |
131 | int i; |
132 | for (i = LOADABLE_LDISC; i < MAXLDISC; i++) |
133 | if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) { |
134 | slot = i; |
135 | } |
136 | } |
137 | else if (discipline >= 0 && discipline < MAXLDISC) { |
138 | slot = discipline; |
139 | } |
140 | |
141 | if (slot != -1 && linesw_p) |
142 | linesw[slot] = *linesw_p; |
143 | |
144 | return slot; |
145 | } |
146 | |
147 | /* |
148 | * ldisc_deregister: Deregister a line discipline obtained with |
149 | * ldisc_register. Can only deregister "loadable" ones now. |
150 | * |
151 | * discipline: Index for discipline to unload. |
152 | */ |
153 | void |
154 | ldisc_deregister(int discipline) |
155 | { |
156 | if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) { |
157 | linesw[discipline] = nodisc; |
158 | } |
159 | } |
160 | |
161 | /* |
162 | * Do nothing specific version of line |
163 | * discipline specific ioctl command. |
164 | */ |
165 | static int |
166 | l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data, |
167 | __unused int flags, __unused struct proc *p) |
168 | { |
169 | return ENOTTY; |
170 | } |
171 | |
172 | static void |
173 | l_nostart(__unused struct tty *tp) |
174 | { |
175 | } |
176 | |