252 lines
6.4 KiB
C
252 lines
6.4 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* 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: @(#)cons.c 7.2 (Berkeley) 5/9/91
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* $Id: cons.c,v 1.15 1994/04/11 21:53:54 cgd Exp $
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*/
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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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extern struct consdev constab[];
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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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void
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cninit()
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{
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register struct consdev *cp;
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/*
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* Collect information about all possible consoles
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* and find the one with highest priority
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*/
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for (cp = constab; cp->cn_probe; cp++) {
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(*cp->cn_probe)(cp);
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if (cp->cn_pri > CN_DEAD &&
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(cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
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cn_tab = cp;
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}
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/*
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* No console, we can handle it
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*/
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if ((cp = cn_tab) == NULL)
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return;
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/*
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* Turn on console
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*/
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(*cp->cn_init)(cp);
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}
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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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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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dev = cn_tab->cn_dev;
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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(dev, &cn_devvp);
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}
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return ((*cdevsw[major(dev)].d_open)(dev, 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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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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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) == 0) && vcount(vp))
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return (0);
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return ((*cdevsw[major(dev)].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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{
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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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return ((*cdevsw[major(dev)].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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{
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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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return ((*cdevsw[major(dev)].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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caddr_t data;
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struct proc *p;
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{
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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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return ((*cdevsw[major(dev)].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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cnselect(dev, rw, p)
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dev_t dev;
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int rw;
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struct proc *p;
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{
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/*
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* Redirect the ioctl, 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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return (ttselect(cn_tab->cn_dev, rw, p));
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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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cnputc(c)
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register 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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