tty_conf.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)tty_conf.c  8.4 (Berkeley) 1/21/94
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: releng/5.2/sys/kern/tty_conf.c 116182 2003-06-11 00:56:59Z obrien $");
   43 
   44 #include "opt_compat.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/tty.h>
   49 #include <sys/conf.h>
   50 
   51 #ifndef MAXLDISC
   52 #define MAXLDISC 9
   53 #endif
   54 
   55 static l_open_t         l_noopen;
   56 static l_close_t        l_noclose;
   57 static l_rint_t         l_norint;
   58 static l_start_t        l_nostart;
   59 
   60 /*
   61  * XXX it probably doesn't matter what the entries other than the l_open
   62  * entry are here.  The l_nullioctl and ttymodem entries still look fishy.
   63  * Reconsider the removal of nullmodem anyway.  It was too much like
   64  * ttymodem, but a completely null version might be useful.
   65  */
   66 #define NODISC(n) \
   67         { l_noopen,     l_noclose,      l_noread,       l_nowrite, \
   68           l_nullioctl,  l_norint,       l_nostart,      ttymodem }
   69 
   70 struct  linesw linesw[MAXLDISC] =
   71 {
   72                                 /* 0- termios */
   73         { ttyopen,      ttylclose,      ttread,         ttwrite,
   74           l_nullioctl,  ttyinput,       ttstart,        ttymodem },
   75         NODISC(1),              /* 1- defunct */
   76                                 /* 2- NTTYDISC */
   77 #ifdef COMPAT_43
   78         { ttyopen,      ttylclose,      ttread,         ttwrite,
   79           l_nullioctl,  ttyinput,       ttstart,        ttymodem },
   80 #else
   81         NODISC(2),
   82 #endif
   83         NODISC(3),              /* loadable */
   84         NODISC(4),              /* SLIPDISC */
   85         NODISC(5),              /* PPPDISC */
   86         NODISC(6),              /* NETGRAPHDISC */
   87         NODISC(7),              /* loadable */
   88         NODISC(8),              /* loadable */
   89 };
   90 
   91 int     nlinesw = sizeof (linesw) / sizeof (linesw[0]);
   92 
   93 static struct linesw nodisc = NODISC(0);
   94 
   95 #define LOADABLE_LDISC 7
   96 /*
   97  * ldisc_register: Register a line discipline.
   98  *
   99  * discipline: Index for discipline to load, or LDISC_LOAD for us to choose.
  100  * linesw_p:   Pointer to linesw_p.
  101  *
  102  * Returns: Index used or -1 on failure.
  103  */
  104 int
  105 ldisc_register(discipline, linesw_p)
  106         int discipline;
  107         struct linesw *linesw_p;
  108 {
  109         int slot = -1;
  110 
  111         if (discipline == LDISC_LOAD) {
  112                 int i;
  113                 for (i = LOADABLE_LDISC; i < MAXLDISC; i++)
  114                         if (bcmp(linesw + i, &nodisc, sizeof(nodisc)) == 0) {
  115                                 slot = i;
  116                         }
  117         }
  118         else if (discipline >= 0 && discipline < MAXLDISC) {
  119                 slot = discipline;
  120         }
  121 
  122         if (slot != -1 && linesw_p)
  123                 linesw[slot] = *linesw_p;
  124 
  125         return slot;
  126 }
  127 
  128 /*
  129  * ldisc_deregister: Deregister a line discipline obtained with
  130  * ldisc_register.
  131  *
  132  * discipline: Index for discipline to unload.
  133  */
  134 void
  135 ldisc_deregister(discipline)
  136         int discipline;
  137 {
  138         if (discipline < MAXLDISC) {
  139                 linesw[discipline] = nodisc;
  140         }
  141 }
  142 
  143 static int
  144 l_noopen(dev, tp)
  145         dev_t dev;
  146         struct tty *tp;
  147 {
  148 
  149         return (ENODEV);
  150 }
  151 
  152 static int
  153 l_noclose(tp, flag)
  154         struct tty *tp;
  155         int flag;
  156 {
  157 
  158         return (ENODEV);
  159 }
  160 
  161 int
  162 l_noread(tp, uio, flag)
  163         struct tty *tp;
  164         struct uio *uio;
  165         int flag;
  166 {
  167 
  168         return (ENODEV);
  169 }
  170 
  171 int
  172 l_nowrite(tp, uio, flag)
  173         struct tty *tp;
  174         struct uio *uio;
  175         int flag;
  176 {
  177 
  178         return (ENODEV);
  179 }
  180 
  181 static int
  182 l_norint(c, tp)
  183         int c;
  184         struct tty *tp;
  185 {
  186 
  187         return (ENODEV);
  188 }
  189 
  190 static int
  191 l_nostart(tp)
  192         struct tty *tp;
  193 {
  194 
  195         return (ENODEV);
  196 }
  197 
  198 /*
  199  * Do nothing specific version of line
  200  * discipline specific ioctl command.
  201  */
  202 int
  203 l_nullioctl(tp, cmd, data, flags, td)
  204         struct tty *tp;
  205         u_long cmd;
  206         char *data;
  207         int flags;
  208         struct thread *td;
  209 {
  210 
  211         return (ENOIOCTL);
  212 }

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

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