153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
|
|
*/
|
|
|
|
/*
|
|
* Indirect driver for controlling tty.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/file.h>
|
|
|
|
#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
cttyopen(dev, flag, mode, p)
|
|
dev_t dev;
|
|
int flag, mode;
|
|
struct proc *p;
|
|
{
|
|
struct vnode *ttyvp = cttyvp(p);
|
|
int error;
|
|
|
|
if (ttyvp == NULL)
|
|
return (ENXIO);
|
|
VOP_LOCK(ttyvp);
|
|
#ifdef PARANOID
|
|
/*
|
|
* Since group is tty and mode is 620 on most terminal lines
|
|
* and since sessions protect terminals from processes outside
|
|
* your session, this check is probably no longer necessary.
|
|
* Since it inhibits setuid root programs that later switch
|
|
* to another user from accessing /dev/tty, we have decided
|
|
* to delete this test. (mckusick 5/93)
|
|
*/
|
|
error = VOP_ACCESS(ttyvp,
|
|
(flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
|
|
if (!error)
|
|
#endif /* PARANOID */
|
|
error = VOP_OPEN(ttyvp, flag, NOCRED, p);
|
|
VOP_UNLOCK(ttyvp);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
cttyread(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
register struct vnode *ttyvp = cttyvp(uio->uio_procp);
|
|
int error;
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
VOP_LOCK(ttyvp);
|
|
error = VOP_READ(ttyvp, uio, flag, NOCRED);
|
|
VOP_UNLOCK(ttyvp);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
cttywrite(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
register struct vnode *ttyvp = cttyvp(uio->uio_procp);
|
|
int error;
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
VOP_LOCK(ttyvp);
|
|
error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
|
|
VOP_UNLOCK(ttyvp);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
cttyioctl(dev, cmd, addr, flag, p)
|
|
dev_t dev;
|
|
int cmd;
|
|
caddr_t addr;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
struct vnode *ttyvp = cttyvp(p);
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
if (cmd == TIOCNOTTY) {
|
|
if (!SESS_LEADER(p)) {
|
|
p->p_flag &= ~P_CONTROLT;
|
|
return (0);
|
|
} else
|
|
return (EINVAL);
|
|
}
|
|
return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
cttyselect(dev, flag, p)
|
|
dev_t dev;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
struct vnode *ttyvp = cttyvp(p);
|
|
|
|
if (ttyvp == NULL)
|
|
return (1); /* try operation to get EOF/failure */
|
|
return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
|
|
}
|