206 lines
4.9 KiB
C
206 lines
4.9 KiB
C
/*-
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* Copyright (c) 2004 Poul-Henning Kamp. All rights reserved.
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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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* 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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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 9
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#endif
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static l_open_t l_noopen;
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static l_close_t l_noclose;
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static l_rint_t l_norint;
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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_nullioctl 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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static struct linesw nodisc = {
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.l_open = l_noopen,
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.l_close = l_noclose,
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.l_read = l_noread,
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.l_write = l_nowrite,
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.l_ioctl = l_nullioctl,
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.l_rint = l_norint,
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.l_start = l_nostart,
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.l_modem = ttymodem
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};
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static struct linesw termios_disc = {
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.l_open = ttyopen,
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.l_close = ttylclose,
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.l_read = ttread,
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.l_write = ttwrite,
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.l_ioctl = l_nullioctl,
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.l_rint = ttyinput,
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.l_start = ttstart,
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.l_modem = ttymodem
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};
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#ifdef COMPAT_43
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# define ntty_disc termios_disc
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#else
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# define ntty_disc nodisc
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#endif
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struct linesw *linesw[MAXLDISC] = {
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&termios_disc, /* 0 - termios */
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&nodisc, /* 1 - defunct */
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&ntty_disc, /* 2 - NTTYDISC */
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&nodisc, /* 3 - loadable */
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&nodisc, /* 4 - SLIPDISC */
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&nodisc, /* 5 - PPPDISC */
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&nodisc, /* 6 - NETGRAPHDISC */
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&nodisc, /* 7 - loadable */
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&nodisc, /* 8 - loadable */
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};
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int nlinesw = sizeof (linesw) / sizeof (linesw[0]);
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#define LOADABLE_LDISC 7
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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 (linesw[i] == &nodisc) {
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slot = i;
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break;
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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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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.
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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 < MAXLDISC)
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linesw[discipline] = &nodisc;
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}
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/*
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* "no" and "null" versions of line discipline functions
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*/
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static int
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l_noopen(struct cdev *dev, struct tty *tp)
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{
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return (ENODEV);
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}
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static int
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l_noclose(struct tty *tp, int flag)
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{
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return (ENODEV);
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}
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int
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l_noread(struct tty *tp, struct uio *uio, int flag)
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{
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return (ENODEV);
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}
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int
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l_nowrite(struct tty *tp, struct uio *uio, int flag)
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{
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return (ENODEV);
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}
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static int
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l_norint(int c, struct tty *tp)
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{
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return (ENODEV);
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}
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static int
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l_nostart(struct tty *tp)
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{
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return (ENODEV);
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}
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int
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l_nullioctl(struct tty *tp, u_long cmd, char *data, int flags, struct thread *td)
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{
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return (ENOIOCTL);
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}
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