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

/*
 * Copyright (c) 2000 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) 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	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	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
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	29	/*-
	30	* Copyright (c) 1982, 1986, 1991, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	* (c) UNIX System Laboratories, Inc.
	33	* All or some portions of this file are derived from material licensed
	34	* to the University of California by American Telephone and Telegraph
	35	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	36	* the permission of UNIX System Laboratories, Inc.
	37	*
	38	* Redistribution and use in source and binary forms, with or without
	39	* modification, are permitted provided that the following conditions
	40	* are met:
	41	* 1. Redistributions of source code must retain the above copyright
	42	* notice, this list of conditions and the following disclaimer.
	43	* 2. Redistributions in binary form must reproduce the above copyright
	44	* notice, this list of conditions and the following disclaimer in the
	45	* documentation and/or other materials provided with the distribution.
	46	* 3. All advertising materials mentioning features or use of this software
	47	* must display the following acknowledgement:
	48	* This product includes software developed by the University of
	49	* California, Berkeley and its contributors.
	50	* 4. Neither the name of the University nor the names of its contributors
	51	* may be used to endorse or promote products derived from this software
	52	* without specific prior written permission.
	53	*
	54	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	55	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	56	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	57	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	58	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	59	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	60	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	61	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	62	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	63	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	64	* SUCH DAMAGE.
	65	*
	66	* @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
	67	*/
	68
	69	#include <sys/param.h>
	70	#include <sys/systm.h>
	71	#include <sys/tty.h>
	72	#include <sys/conf.h>
	73
	74	#ifndef MAXLDISC
	75	#define MAXLDISC 8
	76	#endif
	77
	78	#ifndef NeXT
	79	static l_open_t l_noopen;
	80	static l_close_t l_noclose;
1c79356b	81	static l_rint_t l_norint;
1c79356b	82	#else /* NeXT */
91447636 A	83	#define l_noopen ((l_open_t *) &enodev)
	84	#define l_noclose ((l_close_t *) &enodev)
	85	#define l_noread ((l_read_t *) &enodev)
	86	#define l_nowrite ((l_write_t *) &enodev)
	87	#define l_norint ((l_rint_t *) &enodev)
1c79356b A	88	#endif /* !NeXT */
1c79356b A	89
91447636 A	90	static l_ioctl_t l_noioctl;
	91	static l_start_t l_nostart;
	92
1c79356b A	93	/*
1c79356b A	94	* XXX it probably doesn't matter what the entries other than the l_open
91447636	95	* entry are here. The l_noioctl and ttymodem entries still look fishy.
1c79356b A	96	* Reconsider the removal of nullmodem anyway. It was too much like
	97	* ttymodem, but a completely null version might be useful.
	98	*/
	99	#define NODISC(n) \
	100	{ l_noopen, l_noclose, l_noread, l_nowrite, \
91447636	101	l_noioctl, l_norint, l_nostart, ttymodem }
1c79356b A	102
	103	struct linesw linesw[MAXLDISC] =
	104	{
	105	/* 0- termios */
	106	{ ttyopen, ttylclose, ttread, ttwrite,
91447636	107	l_noioctl, ttyinput, ttwwakeup, ttymodem },
1c79356b A	108	NODISC(1), /* 1- defunct */
1c79356b A	109	/* 2- NTTYDISC */
91447636	110	#if COMPAT_43_TTY
1c79356b	111	{ ttyopen, ttylclose, ttread, ttwrite,
91447636	112	l_noioctl, ttyinput, ttwwakeup, ttymodem },
1c79356b A	113	#else
	114	NODISC(2),
	115	#endif
	116	NODISC(3), /* TABLDISC */
	117	NODISC(4), /* SLIPDISC */
	118	NODISC(5), /* PPPDISC */
	119	NODISC(6), /* loadable */
	120	NODISC(7), /* loadable */
	121	};
	122
	123	int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
	124
	125	static struct linesw nodisc = NODISC(0);
	126
	127	#define LOADABLE_LDISC 6
	128	/*
	129	* ldisc_register: Register a line discipline.
	130	*
	131	* discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
	132	* linesw_p: Pointer to linesw_p.
	133	*
	134	* Returns: Index used or -1 on failure.
	135	*/
	136	int
	137	ldisc_register(discipline, linesw_p)
	138	int discipline;
	139	struct linesw *linesw_p;
	140	{
	141	int slot = -1;
	142
	143	if (discipline == LDISC_LOAD) {
	144	int i;
	145	for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
	146	if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
	147	slot = i;
	148	}
	149	}
	150	else if (discipline >= 0 && discipline < MAXLDISC) {
	151	slot = discipline;
	152	}
	153
	154	if (slot != -1 && linesw_p)
	155	linesw[slot] = *linesw_p;
	156
	157	return slot;
	158	}
	159
	160	/*
	161	* ldisc_deregister: Deregister a line discipline obtained with
	162	* ldisc_register. Can only deregister "loadable" ones now.
	163	*
	164	* discipline: Index for discipline to unload.
	165	*/
	166	void
	167	ldisc_deregister(discipline)
	168	int discipline;
	169	{
	170	if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
	171	linesw[discipline] = nodisc;
	172	}
	173	}
	174
	175	#ifndef NeXT
	176	static int
177	l_noopen(dev, tp)
178	dev_t dev;
179	struct tty *tp;
180	{
181
182	return (ENODEV);
183	}
184
185	static int
186	l_noclose(tp, flag)
187	struct tty *tp;
188	int flag;
189	{
190
191	return (ENODEV);
192	}
193
194	int
195	l_noread(tp, uio, flag)
196	struct tty *tp;
197	struct uio *uio;
198	int flag;
199	{
200
201	return (ENODEV);
202	}
203
204	int
205	l_nowrite(tp, uio, flag)
206	struct tty *tp;
207	struct uio *uio;
208	int flag;
209	{
210
211	return (ENODEV);
212	}
213
214	static int
215	l_norint(c, tp)
216	int c;
217	struct tty *tp;
218	{
219
220	return (ENODEV);
221	}
1c79356b A	222	#endif /* !NeXT */
	223
	224	/*
	225	* Do nothing specific version of line
	226	* discipline specific ioctl command.
	227	*/
	228	static int
91447636 A	229	l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data,
91447636 A	230	__unused int flags, __unused struct proc *p)
1c79356b A	231	{
1c79356b A	232
91447636	233	return ENOTTY;
1c79356b	234	}
91447636 A	235
	236	static void
	237	l_nostart(__unused struct tty *tp)
	238	{ }