179 lines
6.2 KiB
C
179 lines
6.2 KiB
C
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/*
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* Copyright (c) 1997-2006 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#ifndef MAXLDISC
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#define MAXLDISC 8
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#endif
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#define l_nodev (void (*)(void))&enodev
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#define l_noopen ((l_open_t *) l_nodev)
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#define l_noclose ((l_close_t *) l_nodev)
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#define l_noread ((l_read_t *) l_nodev)
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#define l_nowrite ((l_write_t *) l_nodev)
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#define l_norint ((l_rint_t *) l_nodev)
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static l_ioctl_t l_noioctl;
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static l_start_t l_nostart;
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/*
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* XXX it probably doesn't matter what the entries other than the l_open
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* entry are here. The l_noioctl and ttymodem entries still look fishy.
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* Reconsider the removal of nullmodem anyway. It was too much like
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* ttymodem, but a completely null version might be useful.
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*/
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#define NODISC(n) \
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{ l_noopen, l_noclose, l_noread, l_nowrite, \
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l_noioctl, l_norint, l_nostart, ttymodem }
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struct linesw linesw[MAXLDISC] =
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{
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/* 0- termios */
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{ ttyopen, ttylclose, ttread, ttwrite,
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l_noioctl, ttyinput, ttwwakeup, ttymodem },
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NODISC(1), /* 1- defunct */
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/* 2- NTTYDISC */
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{ ttyopen, ttylclose, ttread, ttwrite,
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l_noioctl, ttyinput, ttwwakeup, ttymodem },
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NODISC(3), /* TABLDISC */
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NODISC(4), /* SLIPDISC */
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NODISC(5), /* PPPDISC */
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NODISC(6), /* loadable */
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NODISC(7), /* loadable */
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};
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const int nlinesw = sizeof(linesw) / sizeof(linesw[0]);
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static struct linesw nodisc = NODISC(0);
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#define LOADABLE_LDISC 6
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/*
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* ldisc_register: Register a line discipline.
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*
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* discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
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* linesw_p: Pointer to linesw_p.
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*
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* Returns: Index used or -1 on failure.
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*/
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int
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ldisc_register(int discipline, struct linesw *linesw_p)
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{
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int slot = -1;
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if (discipline == LDISC_LOAD) {
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int i;
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for (i = LOADABLE_LDISC; i < MAXLDISC; i++) {
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if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
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slot = i;
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}
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}
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} else if (discipline >= 0 && discipline < MAXLDISC) {
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slot = discipline;
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}
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if (slot != -1 && linesw_p) {
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linesw[slot] = *linesw_p;
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}
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return slot;
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}
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/*
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* ldisc_deregister: Deregister a line discipline obtained with
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* ldisc_register. Can only deregister "loadable" ones now.
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*
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* discipline: Index for discipline to unload.
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*/
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void
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ldisc_deregister(int discipline)
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{
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if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
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linesw[discipline] = nodisc;
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}
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}
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/*
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* Do nothing specific version of line
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* discipline specific ioctl command.
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*/
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static int
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l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data,
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__unused int flags, __unused struct proc *p)
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{
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return ENOTTY;
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}
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static void
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l_nostart(__unused struct tty *tp)
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{
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}
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