23d5326823
A later change, currently being iterated on in D24459, will in-fact change the lock type to an sx so that TTY drivers can sleep on it if they need to. Committing this ahead of time to make the review in question a little more palatable. tty_lock_assert() is unfortunately still needed for now in two places to make sure that the tty lock has not been recursed upon, for those scenarios where it's supplied by the TTY driver and possibly a mutex that is allowed to recurse. Suggested by: markj
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* 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_simple(struct tty *tp, const void *buf, size_t len);
|
|
size_t ttydisc_rint_bypass(struct tty *tp, const void *buf, size_t len);
|
|
void ttydisc_rint_done(struct tty *tp);
|
|
size_t ttydisc_rint_poll(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);
|
|
size_t ttydisc_getc_poll(struct tty *tp);
|
|
|
|
/* 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_assert_locked(tp);
|
|
|
|
return ttyinq_bytescanonicalized(&tp->t_inq);
|
|
}
|
|
|
|
static __inline size_t
|
|
ttydisc_write_poll(struct tty *tp)
|
|
{
|
|
|
|
tty_assert_locked(tp);
|
|
|
|
return ttyoutq_bytesleft(&tp->t_outq);
|
|
}
|
|
|
|
#endif /* !_SYS_TTYDISC_H_ */
|