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/ttydisc.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/11.0/sys/sys/ttydisc.h 196452 2009-08-23 08:04:40Z ed $
   30  */
   31 
   32 #ifndef _SYS_TTYDISC_H_
   33 #define _SYS_TTYDISC_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 cv;
   40 struct thread;
   41 struct tty;
   42 struct uio;
   43 
   44 /* Top half routines. */
   45 void    ttydisc_open(struct tty *tp);
   46 void    ttydisc_close(struct tty *tp);
   47 int     ttydisc_read(struct tty *tp, struct uio *uio, int ioflag);
   48 int     ttydisc_write(struct tty *tp, struct uio *uio, int ioflag);
   49 void    ttydisc_optimize(struct tty *tp);
   50 
   51 /* Bottom half routines. */
   52 void    ttydisc_modem(struct tty *tp, int open);
   53 #define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
   54 int     ttydisc_rint(struct tty *tp, char c, int flags);
   55 size_t  ttydisc_rint_simple(struct tty *tp, const void *buf, size_t len);
   56 size_t  ttydisc_rint_bypass(struct tty *tp, const void *buf, size_t len);
   57 void    ttydisc_rint_done(struct tty *tp);
   58 size_t  ttydisc_rint_poll(struct tty *tp);
   59 size_t  ttydisc_getc(struct tty *tp, void *buf, size_t len);
   60 int     ttydisc_getc_uio(struct tty *tp, struct uio *uio);
   61 size_t  ttydisc_getc_poll(struct tty *tp);
   62 
   63 /* Error codes for ttydisc_rint(). */
   64 #define TRE_FRAMING     0x01
   65 #define TRE_PARITY      0x02
   66 #define TRE_OVERRUN     0x04
   67 #define TRE_BREAK       0x08
   68 
   69 static __inline size_t
   70 ttydisc_read_poll(struct tty *tp)
   71 {
   72 
   73         tty_lock_assert(tp, MA_OWNED);
   74 
   75         return ttyinq_bytescanonicalized(&tp->t_inq);
   76 }
   77 
   78 static __inline size_t
   79 ttydisc_write_poll(struct tty *tp)
   80 {
   81 
   82         tty_lock_assert(tp, MA_OWNED);
   83 
   84         return ttyoutq_bytesleft(&tp->t_outq);
   85 }
   86 
   87 #endif /* !_SYS_TTYDISC_H_ */

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