e0cc03a09b
kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
403 lines
8.9 KiB
C
403 lines
8.9 KiB
C
/* $NetBSD: cons.c,v 1.45 2002/10/23 09:13:01 jdolecek Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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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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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* from: Utah $Hdr: cons.c 1.7 92/01/21$
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*
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* @(#)cons.c 8.2 (Berkeley) 1/12/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: cons.c,v 1.45 2002/10/23 09:13:01 jdolecek Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <dev/cons.h>
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dev_type_open(cnopen);
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dev_type_close(cnclose);
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dev_type_read(cnread);
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dev_type_write(cnwrite);
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dev_type_ioctl(cnioctl);
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dev_type_poll(cnpoll);
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dev_type_kqfilter(cnkqfilter);
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const struct cdevsw cons_cdevsw = {
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cnopen, cnclose, cnread, cnwrite, cnioctl,
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nostop, notty, cnpoll, nommap, cnkqfilter, D_TTY
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};
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struct tty *constty = NULL; /* virtual console output device */
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struct consdev *cn_tab; /* physical console device info */
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struct vnode *cn_devvp; /* vnode for underlying device. */
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int
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cnopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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const struct cdevsw *cdev;
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dev_t cndev;
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if (cn_tab == NULL)
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return (0);
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/*
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* always open the 'real' console device, so we don't get nailed
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* later. This follows normal device semantics; they always get
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* open() calls.
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*/
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cndev = cn_tab->cn_dev;
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if (cndev == NODEV) {
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/*
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* This is most likely an error in the console attach
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* code. Panicing looks better than jumping into nowhere
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* through cdevsw below....
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*/
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panic("cnopen: no console device");
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}
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if (dev == cndev) {
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/*
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* This causes cnopen() to be called recursively, which
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* is generally a bad thing. It is often caused when
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* dev == 0 and cn_dev has not been set, but was probably
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* initialised to 0.
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*/
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panic("cnopen: cn_tab->cn_dev == dev");
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}
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cdev = cdevsw_lookup(cndev);
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if (cdev == NULL)
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return (ENXIO);
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if (cn_devvp == NULLVP) {
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/* try to get a reference on its vnode, but fail silently */
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cdevvp(cndev, &cn_devvp);
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}
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return ((*cdev->d_open)(cndev, flag, mode, p));
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}
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int
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cnclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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const struct cdevsw *cdev;
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struct vnode *vp;
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if (cn_tab == NULL)
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return (0);
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/*
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* If the real console isn't otherwise open, close it.
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* If it's otherwise open, don't close it, because that'll
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* screw up others who have it open.
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*/
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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if (cn_devvp != NULLVP) {
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/* release our reference to real dev's vnode */
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vrele(cn_devvp);
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cn_devvp = NULLVP;
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}
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if (vfinddev(dev, VCHR, &vp) && vcount(vp))
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return (0);
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return ((*cdev->d_close)(dev, flag, mode, p));
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}
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int
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cnread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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const struct cdevsw *cdev;
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/*
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* If we would redirect input, punt. This will keep strange
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* things from happening to people who are using the real
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* console. Nothing should be using /dev/console for
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* input (except a shell in single-user mode, but then,
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* one wouldn't TIOCCONS then).
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*/
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if (constty != NULL && (cn_tab == NULL || cn_tab->cn_pri != CN_REMOTE))
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return 0;
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else if (cn_tab == NULL)
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return ENXIO;
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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return ((*cdev->d_read)(dev, uio, flag));
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}
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int
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cnwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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const struct cdevsw *cdev;
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/*
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* Redirect output, if that's appropriate.
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* If there's no real console, return ENXIO.
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*/
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if (constty != NULL && (cn_tab == NULL || cn_tab->cn_pri != CN_REMOTE))
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dev = constty->t_dev;
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else if (cn_tab == NULL)
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return ENXIO;
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else
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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return ((*cdev->d_write)(dev, uio, flag));
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}
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int
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cnioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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const struct cdevsw *cdev;
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int error;
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/*
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* Superuser can always use this to wrest control of console
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* output from the "virtual" console.
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*/
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if (cmd == TIOCCONS && constty != NULL) {
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error = suser(p->p_ucred, (u_short *) NULL);
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if (error)
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return (error);
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constty = NULL;
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return (0);
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}
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/*
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* Redirect the ioctl, if that's appropriate.
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* Note that strange things can happen, if a program does
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* ioctls on /dev/console, then the console is redirected
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* out from under it.
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*/
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if (constty != NULL && (cn_tab == NULL || cn_tab->cn_pri != CN_REMOTE))
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dev = constty->t_dev;
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else if (cn_tab == NULL)
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return ENXIO;
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else
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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return ((*cdev->d_ioctl)(dev, cmd, data, flag, p));
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}
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/*ARGSUSED*/
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int
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cnpoll(dev, events, p)
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dev_t dev;
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int events;
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struct proc *p;
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{
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const struct cdevsw *cdev;
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/*
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* Redirect the poll, if that's appropriate.
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* I don't want to think of the possible side effects
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* of console redirection here.
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*/
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if (constty != NULL && (cn_tab == NULL || cn_tab->cn_pri != CN_REMOTE))
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dev = constty->t_dev;
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else if (cn_tab == NULL)
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return ENXIO;
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else
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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return ((*cdev->d_poll)(dev, events, p));
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}
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/*ARGSUSED*/
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int
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cnkqfilter(dev, kn)
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dev_t dev;
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struct knote *kn;
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{
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const struct cdevsw *cdev;
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/*
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* Redirect the kqfilter, if that's appropriate.
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* I don't want to think of the possible side effects
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* of console redirection here.
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*/
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if (constty != NULL && (cn_tab == NULL || cn_tab->cn_pri != CN_REMOTE))
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dev = constty->t_dev;
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else if (cn_tab == NULL)
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return ENXIO;
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else
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dev = cn_tab->cn_dev;
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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return ((*cdev->d_kqfilter)(dev, kn));
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}
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int
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cngetc()
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{
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if (cn_tab == NULL)
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return (0);
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return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
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}
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int
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cngetsn(cp, size)
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char *cp;
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int size;
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{
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char *lp;
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int c, len;
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cnpollc(1);
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lp = cp;
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len = 0;
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for (;;) {
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c = cngetc();
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switch (c) {
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case '\n':
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case '\r':
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printf("\n");
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*lp++ = '\0';
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cnpollc(0);
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return (len);
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case '\b':
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case '\177':
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case '#':
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if (len) {
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--len;
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--lp;
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printf("\b \b");
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}
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continue;
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case '@':
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case 'u'&037: /* CTRL-u */
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len = 0;
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lp = cp;
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printf("\n");
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continue;
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default:
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if (len + 1 >= size || c < ' ') {
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printf("\007");
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continue;
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}
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printf("%c", c);
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++len;
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*lp++ = c;
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}
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}
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}
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void
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cnputc(c)
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int c;
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{
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if (cn_tab == NULL)
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return;
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if (c) {
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(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
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if (c == '\n')
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(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
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}
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}
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void
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cnpollc(on)
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int on;
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{
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static int refcount = 0;
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if (cn_tab == NULL)
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return;
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if (!on)
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--refcount;
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if (refcount == 0)
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(*cn_tab->cn_pollc)(cn_tab->cn_dev, on);
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if (on)
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++refcount;
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}
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void
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nullcnpollc(dev, on)
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dev_t dev;
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int on;
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{
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}
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void
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cnbell(pitch, period, volume)
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u_int pitch, period, volume;
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{
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if (cn_tab == NULL || cn_tab->cn_bell == NULL)
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return;
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(*cn_tab->cn_bell)(cn_tab->cn_dev, pitch, period, volume);
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}
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