/* * Copyright (c) 1997-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * 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 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/tty.h> #include <sys/conf.h> #ifndef MAXLDISC #define MAXLDISC 8 #endif #define l_noopen ((l_open_t *) &enodev) #define l_noclose ((l_close_t *) &enodev) #define l_noread ((l_read_t *) &enodev) #define l_nowrite ((l_write_t *) &enodev) #define l_norint ((l_rint_t *) &enodev) static l_ioctl_t l_noioctl; 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_noioctl 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. */ #define NODISC(n) \ { l_noopen, l_noclose, l_noread, l_nowrite, \ l_noioctl, l_norint, l_nostart, ttymodem } struct linesw linesw[MAXLDISC] = { /* 0- termios */ { ttyopen, ttylclose, ttread, ttwrite, l_noioctl, ttyinput, ttwwakeup, ttymodem }, NODISC(1), /* 1- defunct */ /* 2- NTTYDISC */ { ttyopen, ttylclose, ttread, ttwrite, l_noioctl, ttyinput, ttwwakeup, ttymodem }, 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 = NODISC(0); #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(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(int discipline) { if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) { linesw[discipline] = nodisc; } } /* * Do nothing specific version of line * discipline specific ioctl command. */ static int l_noioctl(__unused struct tty *tp, __unused u_long cmd, __unused caddr_t data, __unused int flags, __unused struct proc *p) { return ENOTTY; } static void l_nostart(__unused struct tty *tp) { }