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/sys/linedisc.h

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    1 /*-
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * Copyright (c) 2004
    5  *      Poul-Henning Kamp.  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  * 4. 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  *      @(#)conf.h      8.5 (Berkeley) 1/9/95
   37  * $FreeBSD: src/sys/sys/linedisc.h,v 1.192 2004/06/26 08:44:04 phk Exp $
   38  */
   39 
   40 #ifndef _SYS_LINEDISC_H_
   41 #define _SYS_LINEDISC_H_
   42 
   43 #ifdef _KERNEL
   44 
   45 struct tty;
   46 
   47 typedef int l_open_t(struct cdev *dev, struct tty *tp);
   48 typedef int l_close_t(struct tty *tp, int flag);
   49 typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
   50 typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
   51 typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
   52                       int flag, struct thread *td);
   53 typedef int l_rint_t(int c, struct tty *tp);
   54 typedef int l_start_t(struct tty *tp);
   55 typedef int l_modem_t(struct tty *tp, int flag);
   56 
   57 /*
   58  * Line discipline switch table
   59  */
   60 struct linesw {
   61         l_open_t        *l_open;
   62         l_close_t       *l_close;
   63         l_read_t        *l_read;
   64         l_write_t       *l_write;
   65         l_ioctl_t       *l_ioctl;
   66         l_rint_t        *l_rint;
   67         l_start_t       *l_start;
   68         l_modem_t       *l_modem;
   69 };
   70 
   71 extern struct linesw *linesw[];
   72 extern int nlinesw;
   73 
   74 int ldisc_register(int , struct linesw *);
   75 void ldisc_deregister(int);
   76 #define LDISC_LOAD      -1              /* Loadable line discipline */
   77 
   78 l_read_t        l_noread;
   79 l_write_t       l_nowrite;
   80 l_ioctl_t       l_nullioctl;
   81 
   82 static __inline int
   83 ttyld_open(struct tty *tp, struct cdev *dev)
   84 {
   85 
   86         return ((*linesw[tp->t_line]->l_open)(dev, tp));
   87 }
   88 
   89 static __inline int
   90 ttyld_close(struct tty *tp, int flag)
   91 {
   92 
   93         return ((*linesw[tp->t_line]->l_close)(tp, flag));
   94 }
   95 
   96 static __inline int
   97 ttyld_read(struct tty *tp, struct uio *uio, int flag)
   98 {
   99 
  100         return ((*linesw[tp->t_line]->l_read)(tp, uio, flag));
  101 }
  102 
  103 static __inline int
  104 ttyld_write(struct tty *tp, struct uio *uio, int flag)
  105 {
  106 
  107         return ((*linesw[tp->t_line]->l_write)(tp, uio, flag));
  108 }
  109 
  110 static __inline int
  111 ttyld_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
  112     struct thread *td)
  113 {
  114 
  115         return ((*linesw[tp->t_line]->l_ioctl)(tp, cmd, data, flag, td));
  116 }
  117 
  118 static __inline int
  119 ttyld_rint(struct tty *tp, int c)
  120 {
  121 
  122         return ((*linesw[tp->t_line]->l_rint)(c, tp));
  123 }
  124 
  125 static __inline int
  126 ttyld_start(struct tty *tp)
  127 {
  128 
  129         return ((*linesw[tp->t_line]->l_start)(tp));
  130 }
  131 
  132 static __inline int
  133 ttyld_modem(struct tty *tp, int flag)
  134 {
  135 
  136         return ((*linesw[tp->t_line]->l_modem)(tp, flag));
  137 }
  138 
  139 #endif /* _KERNEL */
  140 
  141 #endif /* !_SYS_LINEDISC_H_ */

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