a9385ad10f
Thread was not really needed there, while previous ng_tty implementation that used thread pointer had locking issues (using sx while holding mutex).
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*-
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* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_TTYHOOK_H_
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#define _SYS_TTYHOOK_H_
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#ifndef _SYS_TTY_H_
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#error "can only be included through <sys/tty.h>"
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#endif /* !_SYS_TTY_H_ */
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struct tty;
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/*
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* Hooks interface, which allows to capture and inject traffic into the
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* input and output paths of a TTY.
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*/
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typedef int th_rint_t(struct tty *tp, char c, int flags);
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typedef size_t th_rint_bypass_t(struct tty *tp, const void *buf, size_t len);
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typedef void th_rint_done_t(struct tty *tp);
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typedef size_t th_rint_poll_t(struct tty *tp);
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typedef size_t th_getc_inject_t(struct tty *tp, void *buf, size_t len);
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typedef void th_getc_capture_t(struct tty *tp, const void *buf, size_t len);
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typedef size_t th_getc_poll_t(struct tty *tp);
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typedef void th_close_t(struct tty *tp);
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struct ttyhook {
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/* Character input. */
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th_rint_t *th_rint;
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th_rint_bypass_t *th_rint_bypass;
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th_rint_done_t *th_rint_done;
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th_rint_poll_t *th_rint_poll;
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/* Character output. */
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th_getc_inject_t *th_getc_inject;
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th_getc_capture_t *th_getc_capture;
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th_getc_poll_t *th_getc_poll;
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th_close_t *th_close;
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};
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int ttyhook_register(struct tty **, struct proc *, int,
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struct ttyhook *, void *);
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void ttyhook_unregister(struct tty *);
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#define ttyhook_softc(tp) ((tp)->t_hooksoftc)
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#define ttyhook_hashook(tp,hook) ((tp)->t_hook != NULL && \
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(tp)->t_hook->th_ ## hook != NULL)
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static __inline int
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ttyhook_rint(struct tty *tp, char c, int flags)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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return tp->t_hook->th_rint(tp, c, flags);
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}
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static __inline size_t
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ttyhook_rint_bypass(struct tty *tp, const void *buf, size_t len)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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return tp->t_hook->th_rint_bypass(tp, buf, len);
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}
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static __inline void
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ttyhook_rint_done(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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tp->t_hook->th_rint_done(tp);
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}
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static __inline size_t
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ttyhook_rint_poll(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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return tp->t_hook->th_rint_poll(tp);
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}
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static __inline size_t
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ttyhook_getc_inject(struct tty *tp, void *buf, size_t len)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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return tp->t_hook->th_getc_inject(tp, buf, len);
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}
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static __inline void
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ttyhook_getc_capture(struct tty *tp, const void *buf, size_t len)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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tp->t_hook->th_getc_capture(tp, buf, len);
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}
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static __inline size_t
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ttyhook_getc_poll(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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MPASS(!tty_gone(tp));
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return tp->t_hook->th_getc_poll(tp);
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}
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static __inline void
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ttyhook_close(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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tp->t_hook->th_close(tp);
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}
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#endif /* !_SYS_TTYHOOK_H_ */
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