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

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * 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. 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_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
    /*-
     * 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
    
    #ifndef NeXT
    static l_open_t         l_noopen;
    static l_close_t        l_noclose;
    static l_ioctl_t        l_nullioctl;
    static l_rint_t         l_norint;
    static l_start_t        l_nostart;
    #else /* NeXT */
    #define l_noopen        ((int (*) __P((dev_t, struct tty *)))enodev)
    #define l_noclose       ((int (*) __P((struct tty *, int flags)))enodev)
    #define l_noread        ((int (*) __P((struct tty *, struct uio *, int)))enodev)
    #define l_nowrite       l_noread
    #define l_norint        ((int (*) __P((int c, struct tty *)))enodev)
    #define l_nostart       ((int (*) __P((struct tty *)))enodev)
    static  int
    l_nullioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, struct proc *p);
    #endif /* !NeXT */
    
    /*
     * XXX it probably doesn't matter what the entries other than the l_open
     * entry are here.  The l_nullioctl 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_nullioctl,  l_norint,       l_nostart,      ttymodem }
   
   struct  linesw linesw[MAXLDISC] =
   {
                                   /* 0- termios */
           { ttyopen,      ttylclose,      ttread,         ttwrite,
             l_nullioctl,  ttyinput,       ttstart,        ttymodem },
           NODISC(1),              /* 1- defunct */
                                   /* 2- NTTYDISC */
   #ifdef COMPAT_43
           { ttyopen,      ttylclose,      ttread,         ttwrite,
             l_nullioctl,  ttyinput,       ttstart,        ttymodem },
   #else
           NODISC(2),
   #endif
           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(discipline, linesw_p)
           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(discipline)
           int discipline;
   {
           if (discipline >= LOADABLE_LDISC && discipline < MAXLDISC) {
                   linesw[discipline] = nodisc;
           }
   }
   
   #ifndef NeXT
   static int
   l_noopen(dev, tp)
           dev_t dev;
           struct tty *tp;
   {
   
           return (ENODEV);
   }
   
   static int
   l_noclose(tp, flag)
           struct tty *tp;
           int flag;
   {
   
           return (ENODEV);
   }
   
   int
   l_noread(tp, uio, flag)
           struct tty *tp;
           struct uio *uio;
           int flag;
   {
   
           return (ENODEV);
   }
   
   int
   l_nowrite(tp, uio, flag)
           struct tty *tp;
           struct uio *uio;
           int flag;
   {
   
           return (ENODEV);
   }
   
   static int
   l_norint(c, tp)
           int c;
           struct tty *tp;
   {
   
           return (ENODEV);
   }
   
   static int
   l_nostart(tp)
           struct tty *tp;
   {
   
           return (ENODEV);
   }
   #endif /* !NeXT */
   
   /*
    * Do nothing specific version of line
    * discipline specific ioctl command.
    */
   static int
   l_nullioctl(tp, cmd, data, flags, p)
           struct tty *tp;
           u_long cmd;
           caddr_t data;
           int flags;
           struct proc *p;
   {
   
           return (-1);
   }

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