360 lines
9.2 KiB
C
360 lines
9.2 KiB
C
/* $NetBSD: tty_conf.c,v 1.57 2021/08/09 20:49:10 andvar Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2005, 2007 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*-
|
|
* 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. 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 8.5 (Berkeley) 1/9/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: tty_conf.c,v 1.57 2021/08/09 20:49:10 andvar Exp $");
|
|
|
|
#define TTY_ALLOW_PRIVATE
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/ttycom.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/queue.h>
|
|
|
|
static struct linesw termios_disc = {
|
|
.l_name = "termios",
|
|
.l_open = ttylopen,
|
|
.l_close = ttylclose,
|
|
.l_read = ttread,
|
|
.l_write = ttwrite,
|
|
.l_ioctl = ttynullioctl,
|
|
.l_rint = ttyinput,
|
|
.l_start = ttstart,
|
|
.l_modem = ttymodem,
|
|
.l_poll = ttpoll
|
|
};
|
|
|
|
/*
|
|
* This is for the benefit of old BSD TTY compatibility, but since it is
|
|
* identical to termios (except for the name), don't bother conditionalizing
|
|
* it.
|
|
*/
|
|
static struct linesw ntty_disc = { /* old NTTYDISC */
|
|
.l_name = "ntty",
|
|
.l_open = ttylopen,
|
|
.l_close = ttylclose,
|
|
.l_read = ttread,
|
|
.l_write = ttwrite,
|
|
.l_ioctl = ttynullioctl,
|
|
.l_rint = ttyinput,
|
|
.l_start = ttstart,
|
|
.l_modem = ttymodem,
|
|
.l_poll = ttpoll
|
|
};
|
|
|
|
static LIST_HEAD(, linesw) ttyldisc_list = LIST_HEAD_INITIALIZER(ttyldisc_head);
|
|
|
|
/*
|
|
* Note: We don't bother refcounting termios_disc and ntty_disc; they can't
|
|
* be removed from the list, and termios_disc is likely to have very many
|
|
* references (could we overflow the count?).
|
|
*/
|
|
#define TTYLDISC_ISSTATIC(disc) \
|
|
((disc) == &termios_disc || (disc) == &ntty_disc)
|
|
|
|
#define TTYLDISC_HOLD(disc) \
|
|
do { \
|
|
if (! TTYLDISC_ISSTATIC(disc)) { \
|
|
KASSERT((disc)->l_refcnt != UINT_MAX); \
|
|
(disc)->l_refcnt++; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define TTYLDISC_RELE(disc) \
|
|
do { \
|
|
if (! TTYLDISC_ISSTATIC(disc)) { \
|
|
KASSERT((disc)->l_refcnt != 0); \
|
|
(disc)->l_refcnt--; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define TTYLDISC_ISINUSE(disc) \
|
|
(TTYLDISC_ISSTATIC(disc) || (disc)->l_refcnt != 0)
|
|
|
|
/*
|
|
* Do nothing specific version of line
|
|
* discipline specific ioctl command.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
ttynullioctl(struct tty *tp, u_long cmd, void *data, int flags, struct lwp *l)
|
|
{
|
|
|
|
return (EPASSTHROUGH);
|
|
}
|
|
|
|
/*
|
|
* Return error to line discipline
|
|
* specific poll call.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
ttyerrpoll(struct tty *tp, int events, struct lwp *l)
|
|
{
|
|
|
|
return (POLLERR);
|
|
}
|
|
|
|
void
|
|
ttyldisc_init(void)
|
|
{
|
|
|
|
if (ttyldisc_attach(&termios_disc) != 0)
|
|
panic("ttyldisc_init: termios_disc");
|
|
if (ttyldisc_attach(&ntty_disc) != 0)
|
|
panic("ttyldisc_init: ntty_disc");
|
|
}
|
|
|
|
static struct linesw *
|
|
ttyldisc_lookup_locked(const char *name)
|
|
{
|
|
struct linesw *disc;
|
|
|
|
LIST_FOREACH(disc, &ttyldisc_list, l_list) {
|
|
if (strcmp(name, disc->l_name) == 0)
|
|
return (disc);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Look up a line discipline by its name. Caller holds a reference on
|
|
* the returned line discipline.
|
|
*/
|
|
struct linesw *
|
|
ttyldisc_lookup(const char *name)
|
|
{
|
|
struct linesw *disc;
|
|
|
|
mutex_spin_enter(&tty_lock);
|
|
disc = ttyldisc_lookup_locked(name);
|
|
if (disc != NULL)
|
|
TTYLDISC_HOLD(disc);
|
|
mutex_spin_exit(&tty_lock);
|
|
|
|
return (disc);
|
|
}
|
|
|
|
/*
|
|
* Look up a line discipline by its legacy number. Caller holds a
|
|
* reference on the returned line discipline.
|
|
*/
|
|
struct linesw *
|
|
ttyldisc_lookup_bynum(int num)
|
|
{
|
|
struct linesw *disc;
|
|
|
|
mutex_spin_enter(&tty_lock);
|
|
|
|
LIST_FOREACH(disc, &ttyldisc_list, l_list) {
|
|
if (disc->l_no == num) {
|
|
TTYLDISC_HOLD(disc);
|
|
mutex_spin_exit(&tty_lock);
|
|
return (disc);
|
|
}
|
|
}
|
|
|
|
mutex_spin_exit(&tty_lock);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Release a reference on a line discipline previously added by
|
|
* ttyldisc_lookup() or ttyldisc_lookup_bynum().
|
|
*/
|
|
void
|
|
ttyldisc_release(struct linesw *disc)
|
|
{
|
|
|
|
if (disc == NULL)
|
|
return;
|
|
|
|
mutex_spin_enter(&tty_lock);
|
|
TTYLDISC_RELE(disc);
|
|
mutex_spin_exit(&tty_lock);
|
|
}
|
|
|
|
#define TTYLDISC_LEGACY_NUMBER_MIN 10
|
|
#define TTYLDISC_LEGACY_NUMBER_MAX INT_MAX
|
|
|
|
static void
|
|
ttyldisc_assign_legacy_number(struct linesw *disc)
|
|
{
|
|
static const struct {
|
|
const char *name;
|
|
int num;
|
|
} table[] = {
|
|
{ "termios", TTYDISC },
|
|
{ "ntty", 2 /* XXX old NTTYDISC */ },
|
|
{ "tablet", TABLDISC },
|
|
{ "slip", SLIPDISC },
|
|
{ "ppp", PPPDISC },
|
|
{ "strip", STRIPDISC },
|
|
{ "hdlc", HDLCDISC },
|
|
{ NULL, 0 }
|
|
};
|
|
struct linesw *ldisc;
|
|
int i;
|
|
|
|
for (i = 0; table[i].name != NULL; i++) {
|
|
if (strcmp(disc->l_name, table[i].name) == 0) {
|
|
disc->l_no = table[i].num;
|
|
return;
|
|
}
|
|
}
|
|
|
|
disc->l_no = TTYLDISC_LEGACY_NUMBER_MIN;
|
|
|
|
LIST_FOREACH(ldisc, &ttyldisc_list, l_list) {
|
|
if (disc->l_no == ldisc->l_no) {
|
|
KASSERT(disc->l_no < TTYLDISC_LEGACY_NUMBER_MAX);
|
|
disc->l_no++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Register a line discipline.
|
|
*/
|
|
int
|
|
ttyldisc_attach(struct linesw *disc)
|
|
{
|
|
|
|
KASSERT(disc->l_name != NULL);
|
|
KASSERT(disc->l_open != NULL);
|
|
KASSERT(disc->l_close != NULL);
|
|
KASSERT(disc->l_read != NULL);
|
|
KASSERT(disc->l_write != NULL);
|
|
KASSERT(disc->l_ioctl != NULL);
|
|
KASSERT(disc->l_rint != NULL);
|
|
KASSERT(disc->l_start != NULL);
|
|
KASSERT(disc->l_modem != NULL);
|
|
KASSERT(disc->l_poll != NULL);
|
|
|
|
/* You are not allowed to exceed TTLINEDNAMELEN */
|
|
if (strlen(disc->l_name) >= TTLINEDNAMELEN)
|
|
return (ENAMETOOLONG);
|
|
|
|
mutex_spin_enter(&tty_lock);
|
|
|
|
if (ttyldisc_lookup_locked(disc->l_name) != NULL) {
|
|
mutex_spin_exit(&tty_lock);
|
|
return (EEXIST);
|
|
}
|
|
|
|
ttyldisc_assign_legacy_number(disc);
|
|
LIST_INSERT_HEAD(&ttyldisc_list, disc, l_list);
|
|
|
|
mutex_spin_exit(&tty_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove a line discipline.
|
|
*/
|
|
int
|
|
ttyldisc_detach(struct linesw *disc)
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
struct linesw *ldisc = ttyldisc_lookup(disc->l_name);
|
|
|
|
KASSERT(ldisc != NULL);
|
|
KASSERT(ldisc == disc);
|
|
ttyldisc_release(ldisc);
|
|
#endif
|
|
|
|
mutex_spin_enter(&tty_lock);
|
|
|
|
if (TTYLDISC_ISINUSE(disc)) {
|
|
mutex_spin_exit(&tty_lock);
|
|
return (EBUSY);
|
|
}
|
|
|
|
LIST_REMOVE(disc, l_list);
|
|
|
|
mutex_spin_exit(&tty_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the default line discipline.
|
|
*/
|
|
struct linesw *
|
|
ttyldisc_default(void)
|
|
{
|
|
|
|
return (&termios_disc);
|
|
}
|