The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_conf.c

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp.  All rights reserved.
    3  * Copyright (c) 1982, 1986, 1991, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  * (c) UNIX System Laboratories, Inc.
    6  * All or some portions of this file are derived from material licensed
    7  * to the University of California by American Telephone and Telegraph
    8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    9  * the permission of UNIX System Laboratories, Inc.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)tty_conf.c  8.4 (Berkeley) 1/21/94
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_compat.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/tty.h>
   46 #include <sys/conf.h>
   47 
   48 #ifndef MAXLDISC
   49 #define MAXLDISC 9
   50 #endif
   51 
   52 static l_open_t         l_noopen;
   53 static l_close_t        l_noclose;
   54 static l_rint_t         l_norint;
   55 static l_start_t        l_nostart;
   56 
   57 /*
   58  * XXX it probably doesn't matter what the entries other than the l_open
   59  * entry are here.  The l_nullioctl and ttymodem entries still look fishy.
   60  * Reconsider the removal of nullmodem anyway.  It was too much like
   61  * ttymodem, but a completely null version might be useful.
   62  */
   63 
   64 static struct linesw nodisc = {
   65         .l_open =       l_noopen,
   66         .l_close =      l_noclose,
   67         .l_read =       l_noread,
   68         .l_write =      l_nowrite, 
   69         .l_ioctl =      l_nullioctl, 
   70         .l_rint =       l_norint, 
   71         .l_start =      l_nostart, 
   72         .l_modem =      ttymodem
   73 };
   74 
   75 static struct linesw termios_disc = {
   76         .l_open =       tty_open,
   77         .l_close =      ttylclose,
   78         .l_read =       ttread,
   79         .l_write =      ttwrite, 
   80         .l_ioctl =      l_nullioctl, 
   81         .l_rint =       ttyinput, 
   82         .l_start =      ttstart, 
   83         .l_modem =      ttymodem
   84 };
   85 
   86 #ifdef COMPAT_43
   87 #  define ntty_disc             termios_disc
   88 #else
   89 #  define ntty_disc             nodisc
   90 #endif
   91 
   92 struct linesw *linesw[MAXLDISC] = {
   93         &termios_disc,          /* 0 - termios */
   94         &nodisc,                /* 1 - defunct */
   95         &ntty_disc,             /* 2 - NTTYDISC */
   96         &nodisc,                /* 3 - loadable */
   97         &nodisc,                /* 4 - SLIPDISC */
   98         &nodisc,                /* 5 - PPPDISC */
   99         &nodisc,                /* 6 - NETGRAPHDISC */
  100         &nodisc,                /* 7 - loadable */
  101         &nodisc,                /* 8 - loadable */
  102 };
  103 
  104 int     nlinesw = sizeof (linesw) / sizeof (linesw[0]);
  105 
  106 #define LOADABLE_LDISC 7
  107 
  108 /*
  109  * ldisc_register: Register a line discipline.
  110  *
  111  * discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
  112  * linesw_p:   Pointer to linesw_p.
  113  *
  114  * Returns: Index used or -1 on failure.
  115  */
  116 
  117 int
  118 ldisc_register(int discipline, struct linesw *linesw_p)
  119 {
  120         int slot = -1;
  121 
  122         if (discipline == LDISC_LOAD) {
  123                 int i;
  124                 for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
  125                         if (linesw[i] == &nodisc) {
  126                                 slot = i;
  127                                 break;
  128                         }
  129         } else if (discipline >= 0 && discipline < MAXLDISC) {
  130                 slot = discipline;
  131         }
  132 
  133         if (slot != -1 && linesw_p)
  134                 linesw[slot] = linesw_p;
  135 
  136         return slot;
  137 }
  138 
  139 /*
  140  * ldisc_deregister: Deregister a line discipline obtained with
  141  * ldisc_register.
  142  *
  143  * discipline: Index for discipline to unload.
  144  */
  145 
  146 void
  147 ldisc_deregister(int discipline)
  148 {
  149 
  150         if (discipline < MAXLDISC)
  151                 linesw[discipline] = &nodisc;
  152 }
  153 
  154 /*
  155  * "no" and "null" versions of line discipline functions
  156  */
  157 
  158 static int
  159 l_noopen(struct cdev *dev, struct tty *tp)
  160 {
  161 
  162         return (ENODEV);
  163 }
  164 
  165 static int
  166 l_noclose(struct tty *tp, int flag)
  167 {
  168 
  169         return (ENODEV);
  170 }
  171 
  172 int
  173 l_noread(struct tty *tp, struct uio *uio, int flag)
  174 {
  175 
  176         return (ENODEV);
  177 }
  178 
  179 int
  180 l_nowrite(struct tty *tp, struct uio *uio, int flag)
  181 {
  182 
  183         return (ENODEV);
  184 }
  185 
  186 static int
  187 l_norint(int c, struct tty *tp)
  188 {
  189 
  190         return (ENODEV);
  191 }
  192 
  193 static int
  194 l_nostart(struct tty *tp)
  195 {
  196 
  197         return (ENODEV);
  198 }
  199 
  200 int
  201 l_nullioctl(struct tty *tp, u_long cmd, char *data, int flags, struct thread *td)
  202 {
  203 
  204         return (ENOIOCTL);
  205 }

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