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74bb9e3ad5
- In the current design, when a TTY decreases its baud rate, it tries to shrink the queues. This may not always be possible, because it will not free any blocks that are still filled with data. Change the TTY queues to store a `quota' value as well, which means it will not free any blocks when changing the baud rate, but when placing blocks back into the queue. When the amount of blocks exceeds the quota, they get freed. It also fixes some edge cases, where TIOCSETA during read()/ write()-calls could actually make the queue a tiny bit bigger than in normal cases. - Don't leak blocks of memory when calling TIOCSETA when the device driver abandons the TTY while allocating memory. - Create ttyoutq_init() and ttyinq_init() to initialize the queues, instead of initializing them by hand. The new TTY snoop driver also creates an outq, so it's good to have a proper interface to do this. Obtained from: //depot/projects/mpsafetty/...
175 lines
5 KiB
C
175 lines
5 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_TTYQUEUE_H_
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#define _SYS_TTYQUEUE_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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struct ttyinq_block;
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struct ttyoutq_block;
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struct uio;
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/* Data input queue. */
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struct ttyinq {
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TAILQ_HEAD(ttyinq_bhead, ttyinq_block) ti_list;
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struct ttyinq_block *ti_startblock;
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struct ttyinq_block *ti_reprintblock;
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struct ttyinq_block *ti_lastblock;
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unsigned int ti_begin;
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unsigned int ti_linestart;
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unsigned int ti_reprint;
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unsigned int ti_end;
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unsigned int ti_nblocks;
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unsigned int ti_quota;
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};
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#define TTYINQ_DATASIZE 128
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/* Data output queue. */
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struct ttyoutq {
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STAILQ_HEAD(, ttyoutq_block) to_list;
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struct ttyoutq_block *to_lastblock;
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unsigned int to_begin;
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unsigned int to_end;
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unsigned int to_nblocks;
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unsigned int to_quota;
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};
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#define TTYOUTQ_DATASIZE (256 - sizeof(STAILQ_ENTRY(ttyoutq_block)))
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#ifdef _KERNEL
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/* Input queue handling routines. */
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void ttyinq_setsize(struct ttyinq *, struct tty *, size_t);
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void ttyinq_free(struct ttyinq *);
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int ttyinq_read_uio(struct ttyinq *, struct tty *, struct uio *,
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size_t, size_t);
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size_t ttyinq_write(struct ttyinq *, const void *, size_t, int);
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int ttyinq_write_nofrag(struct ttyinq *, const void *, size_t, int);
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void ttyinq_canonicalize(struct ttyinq *);
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size_t ttyinq_findchar(struct ttyinq *, const char *, size_t, char *);
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void ttyinq_flush(struct ttyinq *);
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int ttyinq_peekchar(struct ttyinq *, char *, int *);
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void ttyinq_unputchar(struct ttyinq *);
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void ttyinq_reprintpos_set(struct ttyinq *);
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void ttyinq_reprintpos_reset(struct ttyinq *);
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static __inline void
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ttyinq_init(struct ttyinq *ti)
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{
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TAILQ_INIT(&ti->ti_list);
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}
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static __inline size_t
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ttyinq_getsize(struct ttyinq *ti)
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{
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return (ti->ti_nblocks * TTYINQ_DATASIZE);
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}
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static __inline size_t
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ttyinq_bytesleft(struct ttyinq *ti)
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{
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size_t len;
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/* Make sure the usage never exceeds the length. */
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len = ti->ti_nblocks * TTYINQ_DATASIZE;
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MPASS(len >= ti->ti_end);
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return (len - ti->ti_end);
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}
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static __inline size_t
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ttyinq_bytescanonicalized(struct ttyinq *ti)
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{
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MPASS(ti->ti_begin <= ti->ti_linestart);
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return (ti->ti_linestart - ti->ti_begin);
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}
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static __inline size_t
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ttyinq_bytesline(struct ttyinq *ti)
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{
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MPASS(ti->ti_linestart <= ti->ti_end);
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return (ti->ti_end - ti->ti_linestart);
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}
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/* Input buffer iteration. */
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typedef void ttyinq_line_iterator_t(void *, char, int);
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void ttyinq_line_iterate_from_linestart(struct ttyinq *,
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ttyinq_line_iterator_t *, void *);
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void ttyinq_line_iterate_from_reprintpos(struct ttyinq *,
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ttyinq_line_iterator_t *, void *);
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/* Output queue handling routines. */
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void ttyoutq_flush(struct ttyoutq *);
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void ttyoutq_setsize(struct ttyoutq *, struct tty *, size_t);
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void ttyoutq_free(struct ttyoutq *);
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size_t ttyoutq_read(struct ttyoutq *, void *, size_t);
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int ttyoutq_read_uio(struct ttyoutq *, struct tty *, struct uio *);
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size_t ttyoutq_write(struct ttyoutq *, const void *, size_t);
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int ttyoutq_write_nofrag(struct ttyoutq *, const void *, size_t);
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static __inline void
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ttyoutq_init(struct ttyoutq *to)
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{
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STAILQ_INIT(&to->to_list);
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}
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static __inline size_t
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ttyoutq_getsize(struct ttyoutq *to)
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{
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return (to->to_nblocks * TTYOUTQ_DATASIZE);
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}
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static __inline size_t
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ttyoutq_bytesleft(struct ttyoutq *to)
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{
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size_t len;
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/* Make sure the usage never exceeds the length. */
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len = to->to_nblocks * TTYOUTQ_DATASIZE;
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MPASS(len >= to->to_end);
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return (len - to->to_end);
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}
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static __inline size_t
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ttyoutq_bytesused(struct ttyoutq *to)
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{
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return (to->to_end - to->to_begin);
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}
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#endif /* _KERNEL */
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#endif /* !_SYS_TTYQUEUE_H_ */
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