gems-kernel/source/THIRDPARTY/xnu/bsd/kern/tty_conf.c
2024-06-03 11:29:39 -05:00

178 lines
6.2 KiB
C

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