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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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_ioctl_t	l_nullioctl;
static l_rint_t		l_norint;
static l_start_t	l_nostart;
#else /* NeXT */
#define	l_noopen	((int (*) __P((dev_t, struct tty *)))enodev)
#define	l_noclose	((int (*) __P((struct tty *, int flags)))enodev)
#define	l_noread	((int (*) __P((struct tty *, struct uio *, int)))enodev)
#define	l_nowrite	l_noread
#define	l_norint	((int (*) __P((int c, struct tty *)))enodev)
#define	l_nostart	((int (*) __P((struct tty *)))enodev)
static	int
l_nullioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct proc *p);
#endif /* !NeXT */

/*
 * XXX it probably doesn't matter what the entries other than the l_open
 * entry are here.  The l_nullioctl 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_nullioctl,	l_norint,	l_nostart,	ttymodem }

struct	linesw linesw[MAXLDISC] =
{
				/* 0- termios */
	{ ttyopen,	ttylclose,	ttread,		ttwrite,
	  l_nullioctl,	ttyinput,	ttstart,	ttymodem },
	NODISC(1),		/* 1- defunct */
	  			/* 2- NTTYDISC */
#ifdef COMPAT_43
	{ ttyopen,	ttylclose,	ttread,		ttwrite,
	  l_nullioctl,	ttyinput,	ttstart,	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);
}

static int
l_nostart(tp)
	struct tty *tp;
{

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

/*
 * Do nothing specific version of line
 * discipline specific ioctl command.
 */
static int
l_nullioctl(tp, cmd, data, flags, p)
	struct tty *tp;
	u_long cmd;
	caddr_t data;
	int flags;
	struct proc *p;
{

	return (-1);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	26	/*-
	27	* Copyright (c) 1982, 1986, 1991, 1993
	28	* The Regents of the University of California. All rights reserved.
	29	* (c) UNIX System Laboratories, Inc.
	30	* All or some portions of this file are derived from material licensed
	31	* to the University of California by American Telephone and Telegraph
	32	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	33	* the permission of UNIX System Laboratories, Inc.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*
	63	* @(#)tty_conf.c 8.4 (Berkeley) 1/21/94
	64	*/
	65
	66	#include <sys/param.h>
	67	#include <sys/systm.h>
	68	#include <sys/tty.h>
	69	#include <sys/conf.h>
	70
	71	#ifndef MAXLDISC
	72	#define MAXLDISC 8
	73	#endif
	74
	75	#ifndef NeXT
	76	static l_open_t l_noopen;
	77	static l_close_t l_noclose;
	78	static l_ioctl_t l_nullioctl;
	79	static l_rint_t l_norint;
	80	static l_start_t l_nostart;
	81	#else /* NeXT */
	82	#define l_noopen ((int () __P((dev_t, struct tty )))enodev)
	83	#define l_noclose ((int () __P((struct tty , int flags)))enodev)
	84	#define l_noread ((int () __P((struct tty , struct uio *, int)))enodev)
	85	#define l_nowrite l_noread
86	#define l_norint ((int () __P((int c, struct tty )))enodev)
87	#define l_nostart ((int () __P((struct tty )))enodev)
88	static int
89	l_nullioctl(struct tty tp, u_long cmd, caddr_t data, int flag, struct proc p);
90	#endif /* !NeXT */
91
92	/*
93	* XXX it probably doesn't matter what the entries other than the l_open
94	* entry are here. The l_nullioctl and ttymodem entries still look fishy.
95	* Reconsider the removal of nullmodem anyway. It was too much like
96	* ttymodem, but a completely null version might be useful.
97	*/
98	#define NODISC(n) \
99	{ l_noopen, l_noclose, l_noread, l_nowrite, \
100	l_nullioctl, l_norint, l_nostart, ttymodem }
101
102	struct linesw linesw[MAXLDISC] =
103	{
104	/* 0- termios */
105	{ ttyopen, ttylclose, ttread, ttwrite,
106	l_nullioctl, ttyinput, ttstart, ttymodem },
107	NODISC(1), /* 1- defunct */
108	/* 2- NTTYDISC */
109	#ifdef COMPAT_43
110	{ ttyopen, ttylclose, ttread, ttwrite,
111	l_nullioctl, ttyinput, ttstart, ttymodem },
112	#else
113	NODISC(2),
114	#endif
115	NODISC(3), /* TABLDISC */
116	NODISC(4), /* SLIPDISC */
117	NODISC(5), /* PPPDISC */
118	NODISC(6), /* loadable */
119	NODISC(7), /* loadable */
120	};
121
122	int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
123
124	static struct linesw nodisc = NODISC(0);
125
126	#define LOADABLE_LDISC 6
127	/*
128	* ldisc_register: Register a line discipline.
129	*
130	* discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
131	* linesw_p: Pointer to linesw_p.
132	*
133	* Returns: Index used or -1 on failure.
134	*/
135	int
136	ldisc_register(discipline, linesw_p)
137	int discipline;
138	struct linesw *linesw_p;
139	{
140	int slot = -1;
141
142	if (discipline == LDISC_LOAD) {
143	int i;
144	for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
145	if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
146	slot = i;
147	}
148	}
149	else if (discipline >= 0 && discipline < MAXLDISC) {
150	slot = discipline;
151	}
152
153	if (slot != -1 && linesw_p)
154	linesw[slot] = *linesw_p;
155
156	return slot;
157	}
158
159	/*
160	* ldisc_deregister: Deregister a line discipline obtained with
161	* ldisc_register. Can only deregister "loadable" ones now.
162	*
163	* discipline: Index for discipline to unload.
164	*/
165	void
166	ldisc_deregister(discipline)
167	int discipline;
168	{
169	if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
170	linesw[discipline] = nodisc;
171	}
172	}
173
174	#ifndef NeXT
175	static int
176	l_noopen(dev, tp)
177	dev_t dev;
178	struct tty *tp;
179	{
180
181	return (ENODEV);
182	}
183
184	static int
185	l_noclose(tp, flag)
186	struct tty *tp;
187	int flag;
188	{
189
190	return (ENODEV);
191	}
192
193	int
194	l_noread(tp, uio, flag)
195	struct tty *tp;
196	struct uio *uio;
197	int flag;
198	{
199
200	return (ENODEV);
201	}
202
203	int
204	l_nowrite(tp, uio, flag)
205	struct tty *tp;
206	struct uio *uio;
207	int flag;
208	{
209
210	return (ENODEV);
211	}
212
213	static int
214	l_norint(c, tp)
215	int c;
216	struct tty *tp;
217	{
218
219	return (ENODEV);
220	}
221
222	static int
223	l_nostart(tp)
224	struct tty *tp;
225	{
226
227	return (ENODEV);
228	}
229	#endif /* !NeXT */
230
231	/*
232	* Do nothing specific version of line
233	* discipline specific ioctl command.
234	*/
235	static int
236	l_nullioctl(tp, cmd, data, flags, p)
237	struct tty *tp;
238	u_long cmd;
239	caddr_t data;
240	int flags;
241	struct proc *p;
242	{
243
244	return (-1);
245	}