[unix-history] / sys / kern / tty_tty.c

/*-
 * Copyright (c) 1982, 1986, 1991 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.
 *
 *	from: @(#)tty_tty.c	7.15 (Berkeley) 5/28/91
 *	$Id$
 */

/*
 * Indirect driver for controlling tty.
 */
#include "param.h"
#include "systm.h"
#include "conf.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "vnode.h"
#include "file.h"

#define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)

/*ARGSUSED*/
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);
	error = VOP_ACCESS(ttyvp,
	  (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
	if (!error)
		error = VOP_OPEN(ttyvp, flag, NOCRED, p);
	VOP_UNLOCK(ttyvp);
	return (error);
}

/*ARGSUSED*/
cttyread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	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*/
cttywrite(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	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*/
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 &= ~SCTTY;
			return (0);
		} else
			return (EINVAL);
	}
	return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
}

/*ARGSUSED*/
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));
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1982, 1986, 1991 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
600f7f07 RG	33	* from: @(#)tty_tty.c 7.15 (Berkeley) 5/28/91
600f7f07 RG	34	* $Id$
15637ed4 RG	35	*/
	36
	37	/*
	38	* Indirect driver for controlling tty.
	39	*/
	40	#include "param.h"
	41	#include "systm.h"
	42	#include "conf.h"
	43	#include "ioctl.h"
	44	#include "tty.h"
	45	#include "proc.h"
	46	#include "vnode.h"
	47	#include "file.h"
	48
	49	#define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)
	50
	51	/ARGSUSED/
	52	cttyopen(dev, flag, mode, p)
	53	dev_t dev;
	54	int flag, mode;
	55	struct proc *p;
	56	{
	57	struct vnode *ttyvp = cttyvp(p);
	58	int error;
	59
	60	if (ttyvp == NULL)
	61	return (ENXIO);
	62	VOP_LOCK(ttyvp);
	63	error = VOP_ACCESS(ttyvp,
	64	(flag&FREAD ? VREAD : 0) \| (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
	65	if (!error)
	66	error = VOP_OPEN(ttyvp, flag, NOCRED, p);
	67	VOP_UNLOCK(ttyvp);
	68	return (error);
	69	}
	70
	71	/ARGSUSED/
	72	cttyread(dev, uio, flag)
	73	dev_t dev;
	74	struct uio *uio;
	75	{
	76	register struct vnode *ttyvp = cttyvp(uio->uio_procp);
	77	int error;
	78
	79	if (ttyvp == NULL)
	80	return (EIO);
	81	VOP_LOCK(ttyvp);
	82	error = VOP_READ(ttyvp, uio, flag, NOCRED);
	83	VOP_UNLOCK(ttyvp);
	84	return (error);
	85	}
	86
	87	/ARGSUSED/
	88	cttywrite(dev, uio, flag)
	89	dev_t dev;
	90	struct uio *uio;
	91	{
	92	register struct vnode *ttyvp = cttyvp(uio->uio_procp);
	93	int error;
	94
	95	if (ttyvp == NULL)
	96	return (EIO);
	97	VOP_LOCK(ttyvp);
	98	error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
99	VOP_UNLOCK(ttyvp);
100	return (error);
101	}
102
103	/ARGSUSED/
104	cttyioctl(dev, cmd, addr, flag, p)
105	dev_t dev;
106	int cmd;
107	caddr_t addr;
108	int flag;
109	struct proc *p;
110	{
111	struct vnode *ttyvp = cttyvp(p);
112
113	if (ttyvp == NULL)
114	return (EIO);
115	if (cmd == TIOCNOTTY) {
116	if (!SESS_LEADER(p)) {
117	p->p_flag &= ~SCTTY;
118	return (0);
119	} else
120	return (EINVAL);
121	}
122	return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
123	}
124
125	/ARGSUSED/
126	cttyselect(dev, flag, p)
127	dev_t dev;
128	int flag;
129	struct proc *p;
130	{
131	struct vnode *ttyvp = cttyvp(p);
132
133	if (ttyvp == NULL)
134	return (1); /* try operation to get EOF/failure */
135	return (VOP_SELECT(ttyvp, flag, FREAD\|FWRITE, NOCRED, p));
136	}