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Annotation of XNU/bsd/kern/tty_conf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
        !            23: /*-
        !            24:  * Copyright (c) 1982, 1986, 1991, 1993
        !            25:  *      The Regents of the University of California.  All rights reserved.
        !            26:  * (c) UNIX System Laboratories, Inc.
        !            27:  * All or some portions of this file are derived from material licensed
        !            28:  * to the University of California by American Telephone and Telegraph
        !            29:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            30:  * the permission of UNIX System Laboratories, Inc.
        !            31:  *
        !            32:  * Redistribution and use in source and binary forms, with or without
        !            33:  * modification, are permitted provided that the following conditions
        !            34:  * are met:
        !            35:  * 1. Redistributions of source code must retain the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer.
        !            37:  * 2. Redistributions in binary form must reproduce the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer in the
        !            39:  *    documentation and/or other materials provided with the distribution.
        !            40:  * 3. All advertising materials mentioning features or use of this software
        !            41:  *    must display the following acknowledgement:
        !            42:  *      This product includes software developed by the University of
        !            43:  *      California, Berkeley and its contributors.
        !            44:  * 4. Neither the name of the University nor the names of its contributors
        !            45:  *    may be used to endorse or promote products derived from this software
        !            46:  *    without specific prior written permission.
        !            47:  *
        !            48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            58:  * SUCH DAMAGE.
        !            59:  *
        !            60:  *     @(#)tty_conf.c  8.4 (Berkeley) 1/21/94
        !            61:  */
        !            62: 
        !            63: #include <sys/param.h>
        !            64: #include <sys/systm.h>
        !            65: #include <sys/tty.h>
        !            66: #include <sys/conf.h>
        !            67: 
        !            68: #ifndef MAXLDISC
        !            69: #define MAXLDISC 8
        !            70: #endif
        !            71: 
        !            72: #ifndef NeXT
        !            73: static l_open_t                l_noopen;
        !            74: static l_close_t       l_noclose;
        !            75: static l_ioctl_t       l_nullioctl;
        !            76: static l_rint_t                l_norint;
        !            77: static l_start_t       l_nostart;
        !            78: #else /* NeXT */
        !            79: #define        l_noopen        ((int (*) __P((dev_t, struct tty *)))enodev)
        !            80: #define        l_noclose       ((int (*) __P((struct tty *, int flags)))enodev)
        !            81: #define        l_noread        ((int (*) __P((struct tty *, struct uio *, int)))enodev)
        !            82: #define        l_nowrite       l_noread
        !            83: #define        l_norint        ((int (*) __P((int c, struct tty *)))enodev)
        !            84: #define        l_nostart       ((int (*) __P((struct tty *)))enodev)
        !            85: static int
        !            86: l_nullioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct proc *p);
        !            87: #endif /* !NeXT */
        !            88: 
        !            89: /*
        !            90:  * XXX it probably doesn't matter what the entries other than the l_open
        !            91:  * entry are here.  The l_nullioctl and ttymodem entries still look fishy.
        !            92:  * Reconsider the removal of nullmodem anyway.  It was too much like
        !            93:  * ttymodem, but a completely null version might be useful.
        !            94:  */
        !            95: #define NODISC(n) \
        !            96:        { l_noopen,     l_noclose,      l_noread,       l_nowrite, \
        !            97:          l_nullioctl,  l_norint,       l_nostart,      ttymodem }
        !            98: 
        !            99: struct linesw linesw[MAXLDISC] =
        !           100: {
        !           101:                                /* 0- termios */
        !           102:        { ttyopen,      ttylclose,      ttread,         ttwrite,
        !           103:          l_nullioctl,  ttyinput,       ttstart,        ttymodem },
        !           104:        NODISC(1),              /* 1- defunct */
        !           105:                                /* 2- NTTYDISC */
        !           106: #ifdef COMPAT_43
        !           107:        { ttyopen,      ttylclose,      ttread,         ttwrite,
        !           108:          l_nullioctl,  ttyinput,       ttstart,        ttymodem },
        !           109: #else
        !           110:        NODISC(2),
        !           111: #endif
        !           112:        NODISC(3),              /* TABLDISC */
        !           113:        NODISC(4),              /* SLIPDISC */
        !           114:        NODISC(5),              /* PPPDISC */
        !           115:        NODISC(6),              /* loadable */
        !           116:        NODISC(7),              /* loadable */
        !           117: };
        !           118: 
        !           119: int    nlinesw = sizeof (linesw) / sizeof (linesw[0]);
        !           120: 
        !           121: static struct linesw nodisc = NODISC(0);
        !           122: 
        !           123: #define LOADABLE_LDISC 6
        !           124: /*
        !           125:  * ldisc_register: Register a line discipline.
        !           126:  *
        !           127:  * discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
        !           128:  * linesw_p:   Pointer to linesw_p.
        !           129:  *
        !           130:  * Returns: Index used or -1 on failure.
        !           131:  */
        !           132: int
        !           133: ldisc_register(discipline, linesw_p)
        !           134:        int discipline;
        !           135:        struct linesw *linesw_p;
        !           136: {
        !           137:        int slot = -1;
        !           138: 
        !           139:        if (discipline == LDISC_LOAD) {
        !           140:                int i;
        !           141:                for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
        !           142:                        if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
        !           143:                                slot = i;
        !           144:                        }
        !           145:        }
        !           146:        else if (discipline >= 0 && discipline < MAXLDISC) {
        !           147:                slot = discipline;
        !           148:        }
        !           149: 
        !           150:        if (slot != -1 && linesw_p)
        !           151:                linesw[slot] = *linesw_p;
        !           152: 
        !           153:        return slot;
        !           154: }
        !           155: 
        !           156: /*
        !           157:  * ldisc_deregister: Deregister a line discipline obtained with
        !           158:  * ldisc_register.  Can only deregister "loadable" ones now.
        !           159:  *
        !           160:  * discipline: Index for discipline to unload.
        !           161:  */
        !           162: void
        !           163: ldisc_deregister(discipline)
        !           164:        int discipline;
        !           165: {
        !           166:        if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
        !           167:                linesw[discipline] = nodisc;
        !           168:        }
        !           169: }
        !           170: 
        !           171: #ifndef NeXT
        !           172: static int
        !           173: l_noopen(dev, tp)
        !           174:        dev_t dev;
        !           175:        struct tty *tp;
        !           176: {
        !           177: 
        !           178:        return (ENODEV);
        !           179: }
        !           180: 
        !           181: static int
        !           182: l_noclose(tp, flag)
        !           183:        struct tty *tp;
        !           184:        int flag;
        !           185: {
        !           186: 
        !           187:        return (ENODEV);
        !           188: }
        !           189: 
        !           190: int
        !           191: l_noread(tp, uio, flag)
        !           192:        struct tty *tp;
        !           193:        struct uio *uio;
        !           194:        int flag;
        !           195: {
        !           196: 
        !           197:        return (ENODEV);
        !           198: }
        !           199: 
        !           200: int
        !           201: l_nowrite(tp, uio, flag)
        !           202:        struct tty *tp;
        !           203:        struct uio *uio;
        !           204:        int flag;
        !           205: {
        !           206: 
        !           207:        return (ENODEV);
        !           208: }
        !           209: 
        !           210: static int
        !           211: l_norint(c, tp)
        !           212:        int c;
        !           213:        struct tty *tp;
        !           214: {
        !           215: 
        !           216:        return (ENODEV);
        !           217: }
        !           218: 
        !           219: static int
        !           220: l_nostart(tp)
        !           221:        struct tty *tp;
        !           222: {
        !           223: 
        !           224:        return (ENODEV);
        !           225: }
        !           226: #endif /* !NeXT */
        !           227: 
        !           228: /*
        !           229:  * Do nothing specific version of line
        !           230:  * discipline specific ioctl command.
        !           231:  */
        !           232: static int
        !           233: l_nullioctl(tp, cmd, data, flags, p)
        !           234:        struct tty *tp;
        !           235:        u_long cmd;
        !           236:        caddr_t data;
        !           237:        int flags;
        !           238:        struct proc *p;
        !           239: {
        !           240: 
        !           241:        return (-1);
        !           242: }

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