[unix-history] / usr / src / sys.386bsd / 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.
 *
 *	@(#)tty_tty.c	7.15 (Berkeley) 5/28/91
 */

/*
 * 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
b688fc87 WJ	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	*
	33	* @(#)tty_tty.c 7.15 (Berkeley) 5/28/91
	34	*/
	35
	36	/*
	37	* Indirect driver for controlling tty.
	38	*/
	39	#include "param.h"
	40	#include "systm.h"
	41	#include "conf.h"
	42	#include "ioctl.h"
	43	#include "tty.h"
	44	#include "proc.h"
	45	#include "vnode.h"
	46	#include "file.h"
	47
	48	#define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL)
	49
	50	/ARGSUSED/
	51	cttyopen(dev, flag, mode, p)
	52	dev_t dev;
	53	int flag, mode;
	54	struct proc *p;
	55	{
	56	struct vnode *ttyvp = cttyvp(p);
	57	int error;
	58
	59	if (ttyvp == NULL)
	60	return (ENXIO);
	61	VOP_LOCK(ttyvp);
	62	error = VOP_ACCESS(ttyvp,
	63	(flag&FREAD ? VREAD : 0) \| (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
	64	if (!error)
65	error = VOP_OPEN(ttyvp, flag, NOCRED, p);
66	VOP_UNLOCK(ttyvp);
67	return (error);
68	}
69
70	/ARGSUSED/
71	cttyread(dev, uio, flag)
72	dev_t dev;
73	struct uio *uio;
74	{
75	register struct vnode *ttyvp = cttyvp(uio->uio_procp);
76	int error;
77
78	if (ttyvp == NULL)
79	return (EIO);
80	VOP_LOCK(ttyvp);
81	error = VOP_READ(ttyvp, uio, flag, NOCRED);
82	VOP_UNLOCK(ttyvp);
83	return (error);
84	}
85
86	/ARGSUSED/
87	cttywrite(dev, uio, flag)
88	dev_t dev;
89	struct uio *uio;
90	{
91	register struct vnode *ttyvp = cttyvp(uio->uio_procp);
92	int error;
93
94	if (ttyvp == NULL)
95	return (EIO);
96	VOP_LOCK(ttyvp);
97	error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
98	VOP_UNLOCK(ttyvp);
99	return (error);
100	}
101
102	/ARGSUSED/
103	cttyioctl(dev, cmd, addr, flag, p)
104	dev_t dev;
105	int cmd;
106	caddr_t addr;
107	int flag;
108	struct proc *p;
109	{
110	struct vnode *ttyvp = cttyvp(p);
111
112	if (ttyvp == NULL)
113	return (EIO);
114	if (cmd == TIOCNOTTY) {
115	if (!SESS_LEADER(p)) {
116	p->p_flag &= ~SCTTY;
117	return (0);
118	} else
119	return (EINVAL);
120	}
121	return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
122	}
123
124	/ARGSUSED/
125	cttyselect(dev, flag, p)
126	dev_t dev;
127	int flag;
128	struct proc *p;
129	{
130	struct vnode *ttyvp = cttyvp(p);
131
132	if (ttyvp == NULL)
133	return (1); /* try operation to get EOF/failure */
134	return (VOP_SELECT(ttyvp, flag, FREAD\|FWRITE, NOCRED, p));
135	}