[apple/xnu.git] / bsd / kern / tty_conf.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
/*-
 * 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

#ifndef NeXT
static l_open_t		l_noopen;
static l_close_t	l_noclose;
static l_rint_t		l_norint;
#else /* NeXT */
#define	l_noopen	((l_open_t *)  &enodev)
#define	l_noclose	((l_close_t *) &enodev)
#define	l_noread	((l_read_t *)  &enodev)
#define	l_nowrite	((l_write_t *) &enodev)
#define	l_norint	((l_rint_t *)  &enodev)
#endif /* !NeXT */

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 */
#if COMPAT_43_TTY
	{ ttyopen,	ttylclose,	ttread,		ttwrite,
	  l_noioctl,	ttyinput,	ttwwakeup,	ttymodem },
#else
	NODISC(2),
#endif
	NODISC(3),		/* TABLDISC */
	NODISC(4),		/* SLIPDISC */
	NODISC(5),		/* PPPDISC */
	NODISC(6),		/* loadable */
	NODISC(7),		/* loadable */
};

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(discipline, linesw_p)
	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(discipline)
	int discipline;
{
	if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
		linesw[discipline] = nodisc;
	}
}

#ifndef NeXT
static int
l_noopen(dev, tp)
	dev_t dev;
	struct tty *tp;
{

	return (ENODEV);
}

static int
l_noclose(tp, flag)
	struct tty *tp;
	int flag;
{

	return (ENODEV);
}

int
l_noread(tp, uio, flag)
	struct tty *tp;
	struct uio *uio;
	int flag;
{

	return (ENODEV);
}

int
l_nowrite(tp, uio, flag)
	struct tty *tp;
	struct uio *uio;
	int flag;
{

	return (ENODEV);
}

static int
l_norint(c, tp)
	int c;
	struct tty *tp;
{

	return (ENODEV);
}
#endif /* !NeXT */

/*
 * 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)
    { }
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	23	/*-
	24	* Copyright (c) 1982, 1986, 1991, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	* (c) UNIX System Laboratories, Inc.
	27	* All or some portions of this file are derived from material licensed
	28	* to the University of California by American Telephone and Telegraph
	29	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	30	* the permission of UNIX System Laboratories, Inc.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*
	60	* @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
	61	*/
	62
	63	#include <sys/param.h>
	64	#include <sys/systm.h>
	65	#include <sys/tty.h>
	66	#include <sys/conf.h>
	67
	68	#ifndef MAXLDISC
	69	#define MAXLDISC 8
	70	#endif
	71
	72	#ifndef NeXT
	73	static l_open_t l_noopen;
	74	static l_close_t l_noclose;
1c79356b	75	static l_rint_t l_norint;
1c79356b	76	#else /* NeXT */
91447636 A	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)
1c79356b A	82	#endif /* !NeXT */
1c79356b A	83
91447636 A	84	static l_ioctl_t l_noioctl;
	85	static l_start_t l_nostart;
	86
1c79356b A	87	/*
1c79356b A	88	* XXX it probably doesn't matter what the entries other than the l_open
91447636	89	* entry are here. The l_noioctl and ttymodem entries still look fishy.
1c79356b A	90	* Reconsider the removal of nullmodem anyway. It was too much like
	91	* ttymodem, but a completely null version might be useful.
	92	*/
	93	#define NODISC(n) \
	94	{ l_noopen, l_noclose, l_noread, l_nowrite, \
91447636	95	l_noioctl, l_norint, l_nostart, ttymodem }
1c79356b A	96
	97	struct linesw linesw[MAXLDISC] =
	98	{
	99	/* 0- termios */
	100	{ ttyopen, ttylclose, ttread, ttwrite,
91447636	101	l_noioctl, ttyinput, ttwwakeup, ttymodem },
1c79356b A	102	NODISC(1), /* 1- defunct */
1c79356b A	103	/* 2- NTTYDISC */
91447636	104	#if COMPAT_43_TTY
1c79356b	105	{ ttyopen, ttylclose, ttread, ttwrite,
91447636	106	l_noioctl, ttyinput, ttwwakeup, ttymodem },
1c79356b A	107	#else
	108	NODISC(2),
	109	#endif
	110	NODISC(3), /* TABLDISC */
	111	NODISC(4), /* SLIPDISC */
	112	NODISC(5), /* PPPDISC */
	113	NODISC(6), /* loadable */
	114	NODISC(7), /* loadable */
	115	};
	116
	117	int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
	118
	119	static struct linesw nodisc = NODISC(0);
	120
	121	#define LOADABLE_LDISC 6
	122	/*
	123	* ldisc_register: Register a line discipline.
	124	*
	125	* discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
	126	* linesw_p: Pointer to linesw_p.
	127	*
	128	* Returns: Index used or -1 on failure.
	129	*/
	130	int
	131	ldisc_register(discipline, linesw_p)
	132	int discipline;
	133	struct linesw *linesw_p;
	134	{
	135	int slot = -1;
	136
	137	if (discipline == LDISC_LOAD) {
	138	int i;
	139	for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
	140	if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
	141	slot = i;
	142	}
	143	}
	144	else if (discipline >= 0 && discipline < MAXLDISC) {
	145	slot = discipline;
	146	}
	147
	148	if (slot != -1 && linesw_p)
	149	linesw[slot] = *linesw_p;
	150
	151	return slot;
	152	}
	153
	154	/*
	155	* ldisc_deregister: Deregister a line discipline obtained with
	156	* ldisc_register. Can only deregister "loadable" ones now.
	157	*
	158	* discipline: Index for discipline to unload.
	159	*/
	160	void
	161	ldisc_deregister(discipline)
	162	int discipline;
	163	{
	164	if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
	165	linesw[discipline] = nodisc;
	166	}
	167	}
	168
	169	#ifndef NeXT
	170	static int
171	l_noopen(dev, tp)
172	dev_t dev;
173	struct tty *tp;
174	{
175
176	return (ENODEV);
177	}
178
179	static int
180	l_noclose(tp, flag)
181	struct tty *tp;
182	int flag;
183	{
184
185	return (ENODEV);
186	}
187
188	int
189	l_noread(tp, uio, flag)
190	struct tty *tp;
191	struct uio *uio;
192	int flag;
193	{
194
195	return (ENODEV);
196	}
197
198	int
199	l_nowrite(tp, uio, flag)
200	struct tty *tp;
201	struct uio *uio;
202	int flag;
203	{
204
205	return (ENODEV);
206	}
207
208	static int
209	l_norint(c, tp)
210	int c;
211	struct tty *tp;
212	{
213
214	return (ENODEV);
215	}
1c79356b A	216	#endif /* !NeXT */
	217
	218	/*
	219	* Do nothing specific version of line
	220	* discipline specific ioctl command.
	221	*/
	222	static int
91447636 A	223	l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data,
91447636 A	224	__unused int flags, __unused struct proc *p)
1c79356b A	225	{
1c79356b A	226
91447636	227	return ENOTTY;
1c79356b	228	}
91447636 A	229
	230	static void
	231	l_nostart(__unused struct tty *tp)
	232	{ }