253 lines
6.2 KiB
C
253 lines
6.2 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Indirect driver for controlling tty.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/ttycom.h>
|
|
#include <sys/vnode.h>
|
|
|
|
static d_open_t cttyopen;
|
|
static d_read_t cttyread;
|
|
static d_write_t cttywrite;
|
|
static d_ioctl_t cttyioctl;
|
|
static d_poll_t cttypoll;
|
|
|
|
#define CDEV_MAJOR 1
|
|
|
|
static struct cdevsw ctty_cdevsw = {
|
|
/* open */ cttyopen,
|
|
/* close */ nullclose,
|
|
/* read */ cttyread,
|
|
/* write */ cttywrite,
|
|
/* ioctl */ cttyioctl,
|
|
/* poll */ cttypoll,
|
|
/* mmap */ nommap,
|
|
/* strategy */ nostrategy,
|
|
/* name */ "ctty",
|
|
/* maj */ CDEV_MAJOR,
|
|
/* dump */ nodump,
|
|
/* psize */ nopsize,
|
|
/* flags */ D_TTY,
|
|
};
|
|
|
|
#define cttyvp(td) ((td)->td_proc->p_flag & P_CONTROLT ? (td)->td_proc->p_session->s_ttyvp : NULL)
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
cttyopen(dev, flag, mode, td)
|
|
dev_t dev;
|
|
int flag, mode;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *ttyvp;
|
|
int error;
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
ttyvp = cttyvp(td);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
if (ttyvp == NULL)
|
|
return (ENXIO);
|
|
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
error = VOP_OPEN(ttyvp, flag, NOCRED, td);
|
|
VOP_UNLOCK(ttyvp, 0, td);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
cttyread(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct thread *td = uio->uio_td;
|
|
register struct vnode *ttyvp;
|
|
int error;
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
ttyvp = cttyvp(td);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
error = VOP_READ(ttyvp, uio, flag, NOCRED);
|
|
VOP_UNLOCK(ttyvp, 0, td);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
cttywrite(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct thread *td = uio->uio_td;
|
|
struct vnode *ttyvp;
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
ttyvp = cttyvp(td);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
mp = NULL;
|
|
if (ttyvp->v_type != VCHR &&
|
|
(error = vn_start_write(ttyvp, &mp, V_WAIT | PCATCH)) != 0)
|
|
return (error);
|
|
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
|
|
VOP_UNLOCK(ttyvp, 0, td);
|
|
vn_finished_write(mp);
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
cttyioctl(dev, cmd, addr, flag, td)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t addr;
|
|
int flag;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *ttyvp;
|
|
int error;
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
ttyvp = cttyvp(td);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
if (ttyvp == NULL)
|
|
return (EIO);
|
|
if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
|
|
return EINVAL; /* to controlling tty -- infinite recursion */
|
|
if (cmd == TIOCNOTTY) {
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
error = 0;
|
|
if (!SESS_LEADER(td->td_proc))
|
|
td->td_proc->p_flag &= ~P_CONTROLT;
|
|
else
|
|
error = EINVAL;
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (error);
|
|
}
|
|
return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td));
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
cttypoll(dev, events, td)
|
|
dev_t dev;
|
|
int events;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *ttyvp;
|
|
|
|
PROC_LOCK(td->td_proc);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
ttyvp = cttyvp(td);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
PROC_UNLOCK(td->td_proc);
|
|
|
|
if (ttyvp == NULL)
|
|
/* try operation to get EOF/failure */
|
|
return (seltrue(dev, events, td));
|
|
return (VOP_POLL(ttyvp, events, td->td_ucred, td));
|
|
}
|
|
|
|
static void ctty_clone __P((void *arg, char *name, int namelen, dev_t *dev));
|
|
|
|
static dev_t ctty;
|
|
|
|
static void
|
|
ctty_clone(void *arg, char *name, int namelen, dev_t *dev)
|
|
{
|
|
struct vnode *vp;
|
|
|
|
if (*dev != NODEV)
|
|
return;
|
|
if (strcmp(name, "tty"))
|
|
return;
|
|
vp = cttyvp(curthread);
|
|
if (vp == NULL) {
|
|
if (ctty)
|
|
*dev = ctty;
|
|
} else
|
|
*dev = vp->v_rdev;
|
|
}
|
|
|
|
|
|
static void ctty_drvinit __P((void *unused));
|
|
static void
|
|
ctty_drvinit(unused)
|
|
void *unused;
|
|
{
|
|
|
|
if (devfs_present) {
|
|
EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
|
|
ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty");
|
|
} else {
|
|
make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
|
|
}
|
|
}
|
|
|
|
SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
|