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/*-
* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Portions of this software were developed under sponsorship from Snow
* B.V., the Netherlands.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _SYS_TTYDISC_H_
#define _SYS_TTYDISC_H_
#ifndef _SYS_TTY_H_
#error "can only be included through <sys/tty.h>"
#endif /* !_SYS_TTY_H_ */
struct cv;
struct thread;
struct tty;
struct uio;
/* Top half routines. */
void ttydisc_open(struct tty *tp);
void ttydisc_close(struct tty *tp);
int ttydisc_read(struct tty *tp, struct uio *uio, int ioflag);
int ttydisc_write(struct tty *tp, struct uio *uio, int ioflag);
void ttydisc_optimize(struct tty *tp);
/* Bottom half routines. */
void ttydisc_modem(struct tty *tp, int open);
#define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
int ttydisc_rint(struct tty *tp, char c, int flags);
size_t ttydisc_rint_bypass(struct tty *tp, const void *buf, size_t len);
void ttydisc_rint_done(struct tty *tp);
size_t ttydisc_getc(struct tty *tp, void *buf, size_t len);
int ttydisc_getc_uio(struct tty *tp, struct uio *uio);
/* Error codes for ttydisc_rint(). */
#define TRE_FRAMING 0x01
#define TRE_PARITY 0x02
#define TRE_OVERRUN 0x04
#define TRE_BREAK 0x08
static __inline size_t
ttydisc_read_poll(struct tty *tp)
{
tty_lock_assert(tp, MA_OWNED);
return ttyinq_bytescanonicalized(&tp->t_inq);
}
static __inline size_t
ttydisc_write_poll(struct tty *tp)
{
tty_lock_assert(tp, MA_OWNED);
return ttyoutq_bytesleft(&tp->t_outq);
}
static __inline size_t
ttydisc_rint_poll(struct tty *tp)
{
size_t l;
tty_lock_assert(tp, MA_OWNED);
/*
* XXX: Still allow character input when there's no space in the
* buffers, but we haven't entered the high watermark. This is
* to allow backspace characters to be inserted when in
* canonical mode.
*/
l = ttyinq_bytesleft(&tp->t_inq);
if (l == 0 && (tp->t_flags & TF_HIWAT_IN) == 0)
return (1);
return (l);
}
static __inline size_t
ttydisc_getc_poll(struct tty *tp)
{
tty_lock_assert(tp, MA_OWNED);
if (tp->t_flags & TF_STOPPED)
return (0);
return ttyoutq_bytesused(&tp->t_outq);
}
#endif /* !_SYS_TTYDISC_H_ */
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