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 83static l_ioctl_t l_noioctl; 84static 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 96struct 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 112int nlinesw = sizeof (linesw) / sizeof (linesw[0]); 113 114static 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 */ 125int 126ldisc_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 */ 153void 154ldisc_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 */ 165static int 166l_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 172static void 173l_nostart(__unused struct tty *tp) 174{ 175} 176