3749fcff67
code for looking for open slots in table (and you could hide the table if you wanted to).
172 lines
5.0 KiB
C
172 lines
5.0 KiB
C
/*-
|
|
* 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
|
|
* $Id: tty_conf.c,v 1.4 1994/10/05 21:22:24 wollman Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/conf.h>
|
|
|
|
#define ttynodisc ((int (*) __P((dev_t, struct tty *)))enodev)
|
|
#define ttyerrclose ((int (*) __P((struct tty *, int flags)))enodev)
|
|
#define ttyerrio ((int (*) __P((struct tty *, struct uio *, int)))enodev)
|
|
#define ttyerrinput ((int (*) __P((int c, struct tty *)))enodev)
|
|
#define ttyerrstart ((int (*) __P((struct tty *)))enodev)
|
|
|
|
int nullioctl __P((struct tty *tp, int cmd, caddr_t data,
|
|
int flag, struct proc *p));
|
|
|
|
#ifndef MAXLDISC
|
|
#define MAXLDISC 8
|
|
#endif
|
|
|
|
#define NODISC(n) \
|
|
{ ttynodisc, ttyerrclose, ttyerrio, ttyerrio, nullioctl, \
|
|
ttyerrinput, ttyerrstart, nullmodem },
|
|
|
|
struct linesw linesw[MAXLDISC] =
|
|
{
|
|
{ ttyopen, ttylclose, ttread, ttwrite, nullioctl,
|
|
ttyinput, ttstart, ttymodem }, /* 0- termios */
|
|
|
|
{ ttynodisc, ttyerrclose, ttyerrio, ttyerrio, nullioctl,
|
|
ttyerrinput, ttyerrstart, nullmodem }, /* 1- defunct */
|
|
|
|
#ifdef COMPAT_43
|
|
{ ttyopen, ttylclose, ttread, ttwrite, nullioctl,
|
|
ttyinput, ttstart, ttymodem }, /* 2- NTTYDISC */
|
|
#else
|
|
{ ttynodisc, ttyerrclose, ttyerrio, ttyerrio, nullioctl,
|
|
ttyerrinput, ttyerrstart, nullmodem },
|
|
#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 =
|
|
{
|
|
ttynodisc,
|
|
ttyerrclose,
|
|
ttyerrio,
|
|
ttyerrio,
|
|
nullioctl,
|
|
ttyerrinput,
|
|
ttyerrstart,
|
|
nullmodem
|
|
};
|
|
|
|
#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;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Do nothing specific version of line
|
|
* discipline specific ioctl command.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
nullioctl(tp, cmd, data, flags, p)
|
|
struct tty *tp;
|
|
int cmd;
|
|
char *data;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
|
|
#ifdef lint
|
|
tp = tp; data = data; flags = flags; p = p;
|
|
#endif
|
|
return (-1);
|
|
}
|