4776c07426
we have to revert to TTYDISC which we know will successfully open
rather than try the previous ldisc which might also fail to open.
Do not let ldisc implementations muck about with ->t_line, and remove
code which checks for reopens, it should never happen.
Move ldisc->l_hotchar to tty->t_hotchar and have ldisc implementation
initialize it in their open routines. Reset to zero when we enter
TTYDISC. ("no" should really be -1 since zero could be a valid
hotchar for certain old european mainframe protocols.)
142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2004
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* Poul-Henning Kamp. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)conf.h 8.5 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _SYS_LINEDISC_H_
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#define _SYS_LINEDISC_H_
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#ifdef _KERNEL
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struct tty;
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typedef int l_open_t(struct cdev *dev, struct tty *tp);
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typedef int l_close_t(struct tty *tp, int flag);
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typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
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typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
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typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
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int flag, struct thread *td);
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typedef int l_rint_t(int c, struct tty *tp);
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typedef int l_start_t(struct tty *tp);
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typedef int l_modem_t(struct tty *tp, int flag);
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/*
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* Line discipline switch table
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*/
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struct linesw {
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l_open_t *l_open;
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l_close_t *l_close;
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l_read_t *l_read;
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l_write_t *l_write;
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l_ioctl_t *l_ioctl;
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l_rint_t *l_rint;
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l_start_t *l_start;
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l_modem_t *l_modem;
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};
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extern struct linesw *linesw[];
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extern int nlinesw;
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int ldisc_register(int , struct linesw *);
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void ldisc_deregister(int);
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#define LDISC_LOAD -1 /* Loadable line discipline */
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l_read_t l_noread;
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l_write_t l_nowrite;
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l_ioctl_t l_nullioctl;
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static __inline int
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ttyld_open(struct tty *tp, struct cdev *dev)
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{
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return ((*linesw[tp->t_line]->l_open)(dev, tp));
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}
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static __inline int
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ttyld_close(struct tty *tp, int flag)
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{
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return ((*linesw[tp->t_line]->l_close)(tp, flag));
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}
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static __inline int
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ttyld_read(struct tty *tp, struct uio *uio, int flag)
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{
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return ((*linesw[tp->t_line]->l_read)(tp, uio, flag));
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}
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static __inline int
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ttyld_write(struct tty *tp, struct uio *uio, int flag)
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{
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return ((*linesw[tp->t_line]->l_write)(tp, uio, flag));
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}
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static __inline int
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ttyld_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
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struct thread *td)
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{
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return ((*linesw[tp->t_line]->l_ioctl)(tp, cmd, data, flag, td));
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}
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static __inline int
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ttyld_rint(struct tty *tp, int c)
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{
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return ((*linesw[tp->t_line]->l_rint)(c, tp));
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}
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static __inline int
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ttyld_start(struct tty *tp)
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{
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return ((*linesw[tp->t_line]->l_start)(tp));
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}
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static __inline int
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ttyld_modem(struct tty *tp, int flag)
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{
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return ((*linesw[tp->t_line]->l_modem)(tp, flag));
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}
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#endif /* _KERNEL */
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#endif /* !_SYS_LINEDISC_H_ */
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