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 /*      $NetBSD: tty_conf.c,v 1.44 2004/03/23 13:22:33 junyoung Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)tty_conf.c  8.5 (Berkeley) 1/9/95
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: tty_conf.c,v 1.44 2004/03/23 13:22:33 junyoung Exp $");
   41 
   42 #include "opt_compat_freebsd.h"
   43 #include "opt_compat_43.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/buf.h>
   48 #include <sys/ioctl.h>
   49 #include <sys/proc.h>
   50 #include <sys/tty.h>
   51 #include <sys/ioctl.h>
   52 #include <sys/ttycom.h>
   53 #include <sys/conf.h>
   54 #include <sys/malloc.h>
   55 
   56 #include "tb.h"
   57 #if NTB > 0
   58 int     tbopen(dev_t dev, struct tty *tp);
   59 int     tbclose(struct tty *tp, int flags);
   60 int     tbread(struct tty *tp, struct uio *uio, int flags);
   61 int     tbtioctl(struct tty *tp, u_long cmd, caddr_t data,
   62                  int flag, struct proc *p);
   63 int     tbinput(int c, struct tty *tp);
   64 #endif
   65 
   66 #include "sl.h"
   67 #if NSL > 0
   68 int     slopen(dev_t dev, struct tty *tp);
   69 int     slclose(struct tty *tp, int flags);
   70 int     sltioctl(struct tty *tp, u_long cmd, caddr_t data,
   71                  int flag, struct proc *p);
   72 int     slinput(int c, struct tty *tp);
   73 int     slstart(struct tty *tp);
   74 #endif
   75 
   76 #include "ppp.h"
   77 #if NPPP > 0
   78 int     pppopen(dev_t dev, struct tty *tp);
   79 int     pppclose(struct tty *tp, int flags);
   80 int     ppptioctl(struct tty *tp, u_long cmd, caddr_t data,
   81                   int flag, struct proc *p);
   82 int     pppinput(int c, struct tty *tp);
   83 int     pppstart(struct tty *tp);
   84 int     pppread(struct tty *tp, struct uio *uio, int flag);
   85 int     pppwrite(struct tty *tp, struct uio *uio, int flag);
   86 #endif
   87 
   88 #include "strip.h"
   89 #if NSTRIP > 0
   90 int     stripopen(dev_t dev, struct tty *tp);
   91 int     stripclose(struct tty *tp, int flags);
   92 int     striptioctl(struct tty *tp, u_long cmd, caddr_t data,
   93                     int flag, struct proc *p);
   94 int     stripinput(int c, struct tty *tp);
   95 int     stripstart(struct tty *tp);
   96 #endif
   97 
   98 #include "irframetty.h"
   99 #if NIRFRAMETTY > 0
  100 int     irframetopen(dev_t dev, struct tty *tp);
  101 int     irframetclose(struct tty *tp, int flags);
  102 int     irframetioctl(struct tty *tp, u_long cmd, caddr_t data,
  103                       int flag, struct proc *p);
  104 int     irframetinput(int c, struct tty *tp);
  105 int     irframetstart(struct tty *tp);
  106 int     irframetread(struct tty *tp, struct uio *uio, int flag);
  107 int     irframetwrite(struct tty *tp, struct uio *uio, int flag);
  108 int     irframetpoll(struct tty *tp, int events, struct proc *p);
  109 #endif
  110 
  111 
  112 struct  linesw termios_disc =
  113         { "termios", TTYDISC, ttylopen, ttylclose, ttread, ttwrite,
  114           ttynullioctl, ttyinput, ttstart, ttymodem, ttpoll };  /* 0- termios */
  115 struct  linesw defunct_disc =
  116         { "defunct", 1, ttynodisc, ttyerrclose, ttyerrio, ttyerrio,
  117           ttynullioctl, ttyerrinput, ttyerrstart, nullmodem, ttyerrpoll }; /* 1- defunct */
  118 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD)
  119 struct  linesw ntty_disc =
  120         { "ntty", 2, ttylopen, ttylclose, ttread, ttwrite, ttynullioctl,
  121           ttyinput, ttstart, ttymodem, ttpoll };        /* 2- old NTTYDISC */
  122 #endif
  123 #if NTB > 0
  124 struct  linesw table_disc =
  125         { "tablet", TABLDISC, tbopen, tbclose, tbread, ttyerrio, tbtioctl,
  126           tbinput, ttstart, nullmodem, ttyerrpoll };    /* 3- TABLDISC */
  127 #endif
  128 #if NSL > 0
  129 struct  linesw slip_disc =
  130         { "slip", SLIPDISC, slopen, slclose, ttyerrio, ttyerrio, sltioctl,
  131           slinput, slstart, nullmodem, ttyerrpoll };    /* 4- SLIPDISC */
  132 #endif
  133 #if NPPP > 0
  134 struct  linesw ppp_disc =
  135         { "ppp", PPPDISC, pppopen, pppclose, pppread, pppwrite, ppptioctl,
  136           pppinput, pppstart, ttymodem, ttpoll };       /* 5- PPPDISC */
  137 #endif
  138 #if NSTRIP > 0
  139 struct  linesw strip_disc =
  140         { "strip", STRIPDISC, stripopen, stripclose, ttyerrio, ttyerrio,
  141           striptioctl, stripinput, stripstart, nullmodem, ttyerrpoll };
  142                                                         /* 6- STRIPDISC */
  143 #endif
  144 #if NIRFRAMETTY > 0
  145 struct  linesw irframet_disc =
  146         { "irframe", IRFRAMEDISC, irframetopen, irframetclose, ttyerrio,
  147           ttyerrio, irframetioctl, irframetinput, irframetstart,
  148           ttymodem, ttyerrpoll };                       /* 10- IRFRAMEDISC */
  149 #endif
  150 
  151 /*
  152  * Registered line disciplines.  Don't use this
  153  * it will go away.
  154  */
  155 #define LSWITCHBRK      20
  156 struct  linesw **linesw = NULL;
  157 int     nlinesw = 0;
  158 int     slinesw = 0;
  159 
  160 /*
  161  * Do nothing specific version of line
  162  * discipline specific ioctl command.
  163  */
  164 /*ARGSUSED*/
  165 int
  166 ttynullioctl(tp, cmd, data, flags, p)
  167         struct tty *tp;
  168         u_long cmd;
  169         char *data;
  170         int flags;
  171         struct proc *p;
  172 {
  173 
  174 #ifdef lint
  175         tp = tp; data = data; flags = flags; p = p;
  176 #endif
  177         return (EPASSTHROUGH);
  178 }
  179 
  180 /*
  181  * Register a line discipline, optionally providing a
  182  * specific discipline number for compatibility, -1 allocates
  183  * a new one.  Returns a discipline number, or -1 on
  184  * failure.
  185  */
  186 int
  187 ttyldisc_add(disc, no)
  188         struct linesw *disc;
  189         int no;
  190 {
  191 
  192         /* You are not allowed to exceed TTLINEDNAMELEN */
  193         if (strlen(disc->l_name) >= TTLINEDNAMELEN)
  194                 return (-1);
  195 
  196         /*
  197          * You are not allowed to specify a line switch
  198          * compatibility number greater than 10.
  199          */
  200         if (no > 10)
  201                 return (-1);
  202 
  203         if (linesw == NULL)
  204                 panic("adding uninitialized linesw");
  205 
  206 #ifdef DEBUG
  207         /*
  208          * XXX: For the benefit of LKMs
  209          */
  210         if (disc->l_poll == NULL)
  211                 panic("line discipline must now provide l_poll() entry point");
  212 #endif
  213 
  214         if (no == -1) {
  215                 /* Hunt for any slot */
  216 
  217                 for (no = slinesw; no-- > 0;)
  218                         if (linesw[no] == NULL)
  219                                 break;
  220                 /* if no == -1 we should realloc linesw, but for now... */
  221                 if (no == -1)
  222                         return (-1);
  223         }
  224 
  225         /* Need a specific slot */
  226         if (linesw[no] != NULL)
  227                 return (-1);
  228 
  229         linesw[no] = disc;
  230         disc->l_no = no;
  231 
  232         /* Define size of table */
  233         if (no >= nlinesw)
  234                 nlinesw = no + 1;
  235 
  236         return (no);
  237 }
  238 
  239 /*
  240  * Remove a line discipline by its name.  Returns the
  241  * discipline on success or NULL on failure.
  242  */
  243 struct linesw *
  244 ttyldisc_remove(name)
  245         char *name;
  246 {
  247         struct linesw *disc;
  248         int i;
  249 
  250         if (linesw == NULL)
  251                 panic("removing uninitialized linesw");
  252 
  253         for (i = 0; i < nlinesw; i++) {
  254                 if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0)) {
  255                         disc = linesw[i];
  256                         linesw[i] = NULL;
  257 
  258                         if (nlinesw == i + 1) {
  259                                 /* Need to fix up array sizing */
  260                                 while (i-- > 0 && linesw[i] == NULL)
  261                                         continue;
  262                                 nlinesw = i + 1;
  263                         }
  264                         return (disc);
  265                 }
  266         }
  267         return (NULL);
  268 }
  269 
  270 /*
  271  * Look up a line discipline by its name.
  272  */
  273 struct linesw *
  274 ttyldisc_lookup(name)
  275         char *name;
  276 {
  277         int i;
  278 
  279         for (i = 0; i < nlinesw; i++)
  280                 if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0))
  281                         return (linesw[i]);
  282         return (NULL);
  283 }
  284 
  285 #define TTYLDISCINIT(s, v) \
  286         do { \
  287                 if (ttyldisc_add(&(s), (v)) != (v)) \
  288                         panic("ttyldisc_init: " __STRING(s)); \
  289         } while (/*CONSTCOND*/ 0)
  290 
  291 /*
  292  * Register the basic line disciplines.
  293  */
  294 void
  295 ttyldisc_init()
  296 {
  297 
  298         /* Only initialize once */
  299         if (linesw)
  300                 return;
  301 
  302         slinesw = LSWITCHBRK;
  303         linesw = malloc(slinesw * sizeof(struct linesw *),
  304             M_TTYS, M_WAITOK);
  305         memset(linesw, 0, slinesw * sizeof(struct linesw *));
  306 
  307         TTYLDISCINIT(termios_disc, 0);
  308         /* Do we really need this one? */
  309         TTYLDISCINIT(defunct_disc, 1);
  310 
  311         /*
  312          * The following should really be moved to
  313          * initialization code for each module.
  314          */
  315 
  316 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD)
  317         TTYLDISCINIT(ntty_disc, 2);
  318 #endif
  319 #if NTB > 0
  320         TTYLDISCINIT(table_disc, 3);
  321 #endif
  322 #if NSL > 0
  323         TTYLDISCINIT(slip_disc, 4);
  324 #endif
  325 #if NPPP > 0
  326         TTYLDISCINIT(ppp_disc, 5);
  327 #endif
  328 #if NSTRIP > 0
  329         TTYLDISCINIT(strip_disc, 6);
  330 #endif
  331 #if NIRFRAMETTY > 0
  332         ttyldisc_add(&irframet_disc, -1);
  333 #endif
  334 }

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