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/ttyqueue.h

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    1 /*-
    2  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed under sponsorship from Snow
    6  * B.V., the Netherlands.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/8.1/sys/sys/ttyqueue.h 199583 2009-11-20 15:27:52Z jhb $
   30  */
   31 
   32 #ifndef _SYS_TTYQUEUE_H_
   33 #define _SYS_TTYQUEUE_H_
   34 
   35 #ifndef _SYS_TTY_H_
   36 #error "can only be included through <sys/tty.h>"
   37 #endif /* !_SYS_TTY_H_ */
   38 
   39 struct tty;
   40 struct ttyinq_block;
   41 struct ttyoutq_block;
   42 struct uio;
   43 
   44 /* Data input queue. */
   45 struct ttyinq {
   46         struct ttyinq_block     *ti_firstblock;
   47         struct ttyinq_block     *ti_startblock;
   48         struct ttyinq_block     *ti_reprintblock;
   49         struct ttyinq_block     *ti_lastblock;
   50         unsigned int            ti_begin;
   51         unsigned int            ti_linestart;
   52         unsigned int            ti_reprint;
   53         unsigned int            ti_end;
   54         unsigned int            ti_nblocks;
   55         unsigned int            ti_quota;
   56 };
   57 #define TTYINQ_DATASIZE 128
   58 
   59 /* Data output queue. */
   60 struct ttyoutq {
   61         struct ttyoutq_block    *to_firstblock;
   62         struct ttyoutq_block    *to_lastblock;
   63         unsigned int            to_begin;
   64         unsigned int            to_end;
   65         unsigned int            to_nblocks;
   66         unsigned int            to_quota;
   67 };
   68 #define TTYOUTQ_DATASIZE (256 - sizeof(struct ttyoutq_block *))
   69 
   70 #ifdef _KERNEL
   71 /* Input queue handling routines. */
   72 void    ttyinq_setsize(struct ttyinq *ti, struct tty *tp, size_t len);
   73 void    ttyinq_free(struct ttyinq *ti);
   74 int     ttyinq_read_uio(struct ttyinq *ti, struct tty *tp, struct uio *uio,
   75     size_t readlen, size_t flushlen);
   76 size_t  ttyinq_write(struct ttyinq *ti, const void *buf, size_t len,
   77     int quote);
   78 int     ttyinq_write_nofrag(struct ttyinq *ti, const void *buf, size_t len,
   79     int quote);
   80 void    ttyinq_canonicalize(struct ttyinq *ti);
   81 size_t  ttyinq_findchar(struct ttyinq *ti, const char *breakc, size_t maxlen,
   82     char *lastc);
   83 void    ttyinq_flush(struct ttyinq *ti);
   84 int     ttyinq_peekchar(struct ttyinq *ti, char *c, int *quote);
   85 void    ttyinq_unputchar(struct ttyinq *ti);
   86 void    ttyinq_reprintpos_set(struct ttyinq *ti);
   87 void    ttyinq_reprintpos_reset(struct ttyinq *ti);
   88 
   89 static __inline size_t
   90 ttyinq_getsize(struct ttyinq *ti)
   91 {
   92         return (ti->ti_nblocks * TTYINQ_DATASIZE);
   93 }
   94 
   95 static __inline size_t
   96 ttyinq_getallocatedsize(struct ttyinq *ti)
   97 {
   98 
   99         return (ti->ti_quota * TTYINQ_DATASIZE);
  100 }
  101 
  102 static __inline size_t
  103 ttyinq_bytesleft(struct ttyinq *ti)
  104 {
  105         size_t len;
  106 
  107         /* Make sure the usage never exceeds the length. */
  108         len = ti->ti_nblocks * TTYINQ_DATASIZE;
  109         MPASS(len >= ti->ti_end);
  110 
  111         return (len - ti->ti_end);
  112 }
  113 
  114 static __inline size_t
  115 ttyinq_bytescanonicalized(struct ttyinq *ti)
  116 {
  117         MPASS(ti->ti_begin <= ti->ti_linestart);
  118 
  119         return (ti->ti_linestart - ti->ti_begin);
  120 }
  121 
  122 static __inline size_t
  123 ttyinq_bytesline(struct ttyinq *ti)
  124 {
  125         MPASS(ti->ti_linestart <= ti->ti_end);
  126 
  127         return (ti->ti_end - ti->ti_linestart);
  128 }
  129 
  130 /* Input buffer iteration. */
  131 typedef void ttyinq_line_iterator_t(void *data, char c, int flags);
  132 void    ttyinq_line_iterate_from_linestart(struct ttyinq *ti,
  133     ttyinq_line_iterator_t *iterator, void *data);
  134 void    ttyinq_line_iterate_from_reprintpos(struct ttyinq *ti,
  135     ttyinq_line_iterator_t *iterator, void *data);
  136 
  137 /* Output queue handling routines. */
  138 void    ttyoutq_flush(struct ttyoutq *to);
  139 void    ttyoutq_setsize(struct ttyoutq *to, struct tty *tp, size_t len);
  140 void    ttyoutq_free(struct ttyoutq *to);
  141 size_t  ttyoutq_read(struct ttyoutq *to, void *buf, size_t len);
  142 int     ttyoutq_read_uio(struct ttyoutq *to, struct tty *tp, struct uio *uio);
  143 size_t  ttyoutq_write(struct ttyoutq *to, const void *buf, size_t len);
  144 int     ttyoutq_write_nofrag(struct ttyoutq *to, const void *buf, size_t len);
  145 
  146 static __inline size_t
  147 ttyoutq_getsize(struct ttyoutq *to)
  148 {
  149         return (to->to_nblocks * TTYOUTQ_DATASIZE);
  150 }
  151 
  152 static __inline size_t
  153 ttyoutq_getallocatedsize(struct ttyoutq *to)
  154 {
  155 
  156         return (to->to_quota * TTYOUTQ_DATASIZE);
  157 }
  158 
  159 static __inline size_t
  160 ttyoutq_bytesleft(struct ttyoutq *to)
  161 {
  162         size_t len;
  163 
  164         /* Make sure the usage never exceeds the length. */
  165         len = to->to_nblocks * TTYOUTQ_DATASIZE;
  166         MPASS(len >= to->to_end);
  167 
  168         return (len - to->to_end);
  169 }
  170 
  171 static __inline size_t
  172 ttyoutq_bytesused(struct ttyoutq *to)
  173 {
  174         return (to->to_end - to->to_begin);
  175 }
  176 #endif /* _KERNEL */
  177 
  178 #endif /* !_SYS_TTYQUEUE_H_ */

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