156 lines
4.3 KiB
C
156 lines
4.3 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 1.3 1994/08/02 07:42:57 davidg 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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#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
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/*ARGSUSED*/
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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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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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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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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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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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