358 lines
9.1 KiB
C
358 lines
9.1 KiB
C
/* $NetBSD: tty_conf.c,v 1.55 2008/04/28 20:24:05 martin Exp $ */
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/*-
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* Copyright (c) 2005, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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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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* 3. 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 8.5 (Berkeley) 1/9/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tty_conf.c,v 1.55 2008/04/28 20:24:05 martin Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/ttycom.h>
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#include <sys/conf.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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static struct linesw termios_disc = {
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.l_name = "termios",
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.l_open = ttylopen,
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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 = ttynullioctl,
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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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.l_poll = ttpoll
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};
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/*
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* This is for the benefit of old BSD TTY compatbility, but since it is
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* identical to termios (except for the name), don't bother conditionalizing
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* it.
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*/
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static struct linesw ntty_disc = { /* old NTTYDISC */
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.l_name = "ntty",
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.l_open = ttylopen,
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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 = ttynullioctl,
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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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.l_poll = ttpoll
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};
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static LIST_HEAD(, linesw) ttyldisc_list = LIST_HEAD_INITIALIZER(ttyldisc_head);
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/*
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* Note: We don't bother refcounting termios_disc and ntty_disc; they can't
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* be removed from the list, and termios_disc is likely to have very many
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* references (could we overflow the count?).
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*/
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#define TTYLDISC_ISSTATIC(disc) \
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((disc) == &termios_disc || (disc) == &ntty_disc)
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#define TTYLDISC_HOLD(disc) \
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do { \
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if (! TTYLDISC_ISSTATIC(disc)) { \
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KASSERT((disc)->l_refcnt != UINT_MAX); \
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(disc)->l_refcnt++; \
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} \
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} while (/*CONSTCOND*/0)
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#define TTYLDISC_RELE(disc) \
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do { \
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if (! TTYLDISC_ISSTATIC(disc)) { \
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KASSERT((disc)->l_refcnt != 0); \
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(disc)->l_refcnt--; \
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} \
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} while (/*CONSTCOND*/0)
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#define TTYLDISC_ISINUSE(disc) \
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(TTYLDISC_ISSTATIC(disc) || (disc)->l_refcnt != 0)
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/*
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* Do nothing specific version of line
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* discipline specific ioctl command.
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*/
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/*ARGSUSED*/
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int
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ttynullioctl(struct tty *tp, u_long cmd, void *data, int flags, struct lwp *l)
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{
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return (EPASSTHROUGH);
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}
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/*
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* Return error to line discipline
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* specific poll call.
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*/
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/*ARGSUSED*/
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int
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ttyerrpoll(struct tty *tp, int events, struct lwp *l)
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{
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return (POLLERR);
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}
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void
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ttyldisc_init(void)
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{
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if (ttyldisc_attach(&termios_disc) != 0)
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panic("ttyldisc_init: termios_disc");
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if (ttyldisc_attach(&ntty_disc) != 0)
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panic("ttyldisc_init: ntty_disc");
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}
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static struct linesw *
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ttyldisc_lookup_locked(const char *name)
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{
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struct linesw *disc;
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LIST_FOREACH(disc, &ttyldisc_list, l_list) {
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if (strcmp(name, disc->l_name) == 0)
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return (disc);
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}
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return (NULL);
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}
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/*
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* Look up a line discipline by its name. Caller holds a reference on
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* the returned line discipline.
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*/
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struct linesw *
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ttyldisc_lookup(const char *name)
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{
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struct linesw *disc;
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mutex_spin_enter(&tty_lock);
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disc = ttyldisc_lookup_locked(name);
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if (disc != NULL)
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TTYLDISC_HOLD(disc);
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mutex_spin_exit(&tty_lock);
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return (disc);
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}
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/*
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* Look up a line discipline by its legacy number. Caller holds a
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* reference on the returned line discipline.
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*/
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struct linesw *
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ttyldisc_lookup_bynum(int num)
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{
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struct linesw *disc;
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mutex_spin_enter(&tty_lock);
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LIST_FOREACH(disc, &ttyldisc_list, l_list) {
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if (disc->l_no == num) {
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TTYLDISC_HOLD(disc);
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mutex_spin_exit(&tty_lock);
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return (disc);
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}
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}
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mutex_spin_exit(&tty_lock);
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return (NULL);
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}
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/*
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* Release a reference on a line discipline previously added by
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* ttyldisc_lookup() or ttyldisc_lookup_bynum().
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*/
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void
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ttyldisc_release(struct linesw *disc)
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{
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if (disc == NULL)
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return;
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mutex_spin_enter(&tty_lock);
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TTYLDISC_RELE(disc);
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mutex_spin_exit(&tty_lock);
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}
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#define TTYLDISC_LEGACY_NUMBER_MIN 10
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#define TTYLDISC_LEGACY_NUMBER_MAX INT_MAX
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static void
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ttyldisc_assign_legacy_number(struct linesw *disc)
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{
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static const struct {
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const char *name;
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int num;
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} table[] = {
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{ "termios", TTYDISC },
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{ "ntty", 2 /* XXX old NTTYDISC */ },
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{ "tablet", TABLDISC },
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{ "slip", SLIPDISC },
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{ "ppp", PPPDISC },
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{ "strip", STRIPDISC },
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{ "hdlc", HDLCDISC },
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{ NULL, 0 }
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};
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struct linesw *ldisc;
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int i;
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for (i = 0; table[i].name != NULL; i++) {
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if (strcmp(disc->l_name, table[i].name) == 0) {
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disc->l_no = table[i].num;
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return;
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}
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}
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disc->l_no = TTYLDISC_LEGACY_NUMBER_MIN;
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LIST_FOREACH(ldisc, &ttyldisc_list, l_list) {
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if (disc->l_no == ldisc->l_no) {
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KASSERT(disc->l_no < TTYLDISC_LEGACY_NUMBER_MAX);
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disc->l_no++;
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}
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}
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}
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/*
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* Register a line discipline.
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*/
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int
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ttyldisc_attach(struct linesw *disc)
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{
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KASSERT(disc->l_name != NULL);
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KASSERT(disc->l_open != NULL);
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KASSERT(disc->l_close != NULL);
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KASSERT(disc->l_read != NULL);
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KASSERT(disc->l_write != NULL);
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KASSERT(disc->l_ioctl != NULL);
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KASSERT(disc->l_rint != NULL);
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KASSERT(disc->l_start != NULL);
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KASSERT(disc->l_modem != NULL);
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KASSERT(disc->l_poll != NULL);
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/* You are not allowed to exceed TTLINEDNAMELEN */
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if (strlen(disc->l_name) >= TTLINEDNAMELEN)
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return (ENAMETOOLONG);
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mutex_spin_enter(&tty_lock);
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if (ttyldisc_lookup_locked(disc->l_name) != NULL) {
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mutex_spin_exit(&tty_lock);
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return (EEXIST);
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}
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ttyldisc_assign_legacy_number(disc);
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LIST_INSERT_HEAD(&ttyldisc_list, disc, l_list);
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mutex_spin_exit(&tty_lock);
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return (0);
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}
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/*
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* Remove a line discipline.
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*/
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int
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ttyldisc_detach(struct linesw *disc)
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{
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#ifdef DIAGNOSTIC
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struct linesw *ldisc = ttyldisc_lookup(disc->l_name);
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KASSERT(ldisc != NULL);
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KASSERT(ldisc == disc);
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ttyldisc_release(ldisc);
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#endif
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mutex_spin_enter(&tty_lock);
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if (TTYLDISC_ISINUSE(disc)) {
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mutex_spin_exit(&tty_lock);
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return (EBUSY);
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}
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LIST_REMOVE(disc, l_list);
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mutex_spin_exit(&tty_lock);
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return (0);
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}
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/*
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* Return the default line discipline.
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*/
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struct linesw *
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ttyldisc_default(void)
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{
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return (&termios_disc);
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}
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