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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