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