87f6c6625d
most devsw referenced functions are now static, as they are in the same file as their devsw structure. I've also added DEVFS support for nearly every device in the system, however many of the devices have 'incorrect' names under DEVFS because I couldn't quickly work out the correct naming conventions. (but devfs won't be coming on line for a month or so anyhow so that doesn't matter) If you "OWN" a device which would normally have an entry in /dev then search for the devfs_add_devsw() entries and munge to make them right.. check out similar devices to see what I might have done in them in you can't see what's going on.. for a laugh compare conf.c conf.h defore and after... :) I have not doen DEVFS entries for any DISKSLICE devices yet as that will be a much more complicated job.. (pass 5 :) pass 4 will be to make the devsw tables of type (cdevsw * ) rather than (cdevsw) seems to work here.. complaints to the usual places.. :)
196 lines
5.2 KiB
C
196 lines
5.2 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
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* $Id: tty_tty.c,v 1.7 1995/11/29 14:40:38 julian Exp $
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*/
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/*
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* Indirect driver for controlling tty.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/ioctl.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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static d_open_t cttyopen;
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static d_read_t cttyread;
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static d_write_t cttywrite;
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static d_ioctl_t cttyioctl;
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static d_select_t cttyselect;
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#define CDEV_MAJOR 1
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struct cdevsw ctty_cdevsw =
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{ cttyopen, nullclose, cttyread, cttywrite, /*1*/
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cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
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cttyselect, nommap, NULL, "ctty", NULL, -1 };
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#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
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/*ARGSUSED*/
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static int
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cttyopen(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 *ttyvp = cttyvp(p);
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int error;
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if (ttyvp == NULL)
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return (ENXIO);
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VOP_LOCK(ttyvp);
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#ifdef PARANOID
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/*
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* Since group is tty and mode is 620 on most terminal lines
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* and since sessions protect terminals from processes outside
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* your session, this check is probably no longer necessary.
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* Since it inhibits setuid root programs that later switch
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* to another user from accessing /dev/tty, we have decided
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* to delete this test. (mckusick 5/93)
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*/
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error = VOP_ACCESS(ttyvp,
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(flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
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if (!error)
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#endif /* PARANOID */
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error = VOP_OPEN(ttyvp, flag, NOCRED, p);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttyread(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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register struct vnode *ttyvp = cttyvp(uio->uio_procp);
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int error;
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if (ttyvp == NULL)
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return (EIO);
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VOP_LOCK(ttyvp);
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error = VOP_READ(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttywrite(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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register struct vnode *ttyvp = cttyvp(uio->uio_procp);
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int error;
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if (ttyvp == NULL)
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return (EIO);
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VOP_LOCK(ttyvp);
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error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
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VOP_UNLOCK(ttyvp);
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return (error);
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}
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/*ARGSUSED*/
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static int
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cttyioctl(dev, cmd, addr, flag, p)
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dev_t dev;
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int cmd;
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caddr_t addr;
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int flag;
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struct proc *p;
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{
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struct vnode *ttyvp = cttyvp(p);
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if (ttyvp == NULL)
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return (EIO);
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if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
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return EINVAL; /* to controlling tty -- infinite recursion */
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if (cmd == TIOCNOTTY) {
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if (!SESS_LEADER(p)) {
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p->p_flag &= ~P_CONTROLT;
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return (0);
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} else
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return (EINVAL);
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}
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return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
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}
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/*ARGSUSED*/
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static int
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cttyselect(dev, flag, p)
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dev_t dev;
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int flag;
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struct proc *p;
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{
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struct vnode *ttyvp = cttyvp(p);
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if (ttyvp == NULL)
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return (1); /* try operation to get EOF/failure */
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return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
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}
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static ctty_devsw_installed = 0;
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static void *ctty_devfs_token;
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static void
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ctty_drvinit(void *unused)
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{
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dev_t dev;
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if( ! ctty_devsw_installed ) {
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dev = makedev(CDEV_MAJOR,0);
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cdevsw_add(&dev,&ctty_cdevsw,NULL);
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ctty_devsw_installed = 1;
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#ifdef DEVFS
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ctty_devfs_token = devfs_add_devsw( "/", "tty",
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&ctty_cdevsw, 0, DV_CHR, 0, 0, 0600);
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#endif
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}
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}
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SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
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