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67d350d60c
While merging back my changes from Perforce, it seemed I removed a locking assertion that still applies to ttydisc_rint_poll(). Restore it, because it may come in handy.
116 lines
3.3 KiB
C
116 lines
3.3 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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* Portions of this software were developed under sponsorship from Snow
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* B.V., the Netherlands.
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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_TTYDISC_H_
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#define _SYS_TTYDISC_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 cv;
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struct thread;
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struct tty;
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struct uio;
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/* Top half routines. */
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void ttydisc_open(struct tty *);
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void ttydisc_close(struct tty *);
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int ttydisc_read(struct tty *, struct uio *, int);
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int ttydisc_write(struct tty *, struct uio *, int);
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void ttydisc_optimize(struct tty *);
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/* Bottom half routines. */
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void ttydisc_modem(struct tty *, int);
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#define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
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int ttydisc_rint(struct tty *, char, int);
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size_t ttydisc_rint_bypass(struct tty *, char *, size_t);
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void ttydisc_rint_done(struct tty *);
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size_t ttydisc_getc(struct tty *, void *buf, size_t);
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int ttydisc_getc_uio(struct tty *, struct uio *);
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/* Error codes for ttydisc_rint(). */
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#define TRE_FRAMING 0x01
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#define TRE_PARITY 0x02
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#define TRE_OVERRUN 0x04
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#define TRE_BREAK 0x08
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static __inline size_t
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ttydisc_read_poll(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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return ttyinq_bytescanonicalized(&tp->t_inq);
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}
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static __inline size_t
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ttydisc_write_poll(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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return ttyoutq_bytesleft(&tp->t_outq);
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}
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static __inline size_t
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ttydisc_rint_poll(struct tty *tp)
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{
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size_t l;
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tty_lock_assert(tp, MA_OWNED);
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/*
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* XXX: Still allow character input when there's no space in the
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* buffers, but we haven't entered the high watermark. This is
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* to allow backspace characters to be inserted when in
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* canonical mode.
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*/
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l = ttyinq_bytesleft(&tp->t_inq);
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if (l == 0 && (tp->t_flags & TF_HIWAT_IN) == 0)
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return (1);
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return (l);
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}
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static __inline size_t
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ttydisc_getc_poll(struct tty *tp)
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{
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tty_lock_assert(tp, MA_OWNED);
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if (tp->t_flags & TF_STOPPED)
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return (0);
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return ttyoutq_bytesused(&tp->t_outq);
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}
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#endif /* !_SYS_TTYDISC_H_ */
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