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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Portions of this software were developed under sponsorship from Snow
    8  * B.V., the Netherlands.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD: releng/12.0/sys/sys/ttydisc.h 326256 2017-11-27 15:01:59Z pfg $
   32  */
   33 
   34 #ifndef _SYS_TTYDISC_H_
   35 #define _SYS_TTYDISC_H_
   36 
   37 #ifndef _SYS_TTY_H_
   38 #error "can only be included through <sys/tty.h>"
   39 #endif /* !_SYS_TTY_H_ */
   40 
   41 struct cv;
   42 struct thread;
   43 struct tty;
   44 struct uio;
   45 
   46 /* Top half routines. */
   47 void    ttydisc_open(struct tty *tp);
   48 void    ttydisc_close(struct tty *tp);
   49 int     ttydisc_read(struct tty *tp, struct uio *uio, int ioflag);
   50 int     ttydisc_write(struct tty *tp, struct uio *uio, int ioflag);
   51 void    ttydisc_optimize(struct tty *tp);
   52 
   53 /* Bottom half routines. */
   54 void    ttydisc_modem(struct tty *tp, int open);
   55 #define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
   56 int     ttydisc_rint(struct tty *tp, char c, int flags);
   57 size_t  ttydisc_rint_simple(struct tty *tp, const void *buf, size_t len);
   58 size_t  ttydisc_rint_bypass(struct tty *tp, const void *buf, size_t len);
   59 void    ttydisc_rint_done(struct tty *tp);
   60 size_t  ttydisc_rint_poll(struct tty *tp);
   61 size_t  ttydisc_getc(struct tty *tp, void *buf, size_t len);
   62 int     ttydisc_getc_uio(struct tty *tp, struct uio *uio);
   63 size_t  ttydisc_getc_poll(struct tty *tp);
   64 
   65 /* Error codes for ttydisc_rint(). */
   66 #define TRE_FRAMING     0x01
   67 #define TRE_PARITY      0x02
   68 #define TRE_OVERRUN     0x04
   69 #define TRE_BREAK       0x08
   70 
   71 static __inline size_t
   72 ttydisc_read_poll(struct tty *tp)
   73 {
   74 
   75         tty_lock_assert(tp, MA_OWNED);
   76 
   77         return ttyinq_bytescanonicalized(&tp->t_inq);
   78 }
   79 
   80 static __inline size_t
   81 ttydisc_write_poll(struct tty *tp)
   82 {
   83 
   84         tty_lock_assert(tp, MA_OWNED);
   85 
   86         return ttyoutq_bytesleft(&tp->t_outq);
   87 }
   88 
   89 #endif /* !_SYS_TTYDISC_H_ */

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