[apple/xnu.git] / bsd / kern / tty_tty.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
/*-
 * 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_internal.h>
#include <sys/tty.h>
#include <sys/vnode_internal.h>
#include <sys/file_internal.h>
#ifndef NeXT
#include <sys/kernel.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/

static	d_open_t	cttyopen;
static	d_read_t	cttyread;
static	d_write_t	cttywrite;
static	d_ioctl_t	cttyioctl;
static	d_select_t	cttyselect;

#endif /* !NeXT */

/* Forward declarations for cdevsw[] entry */
/* XXX we should consider making these static */
int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
int cttyread(dev_t dev, struct uio *uio, int flag);
int cttywrite(dev_t dev, struct uio *uio, int flag);
int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);

#ifndef NeXT

#define CDEV_MAJOR 1
/* Don't make static, fdesc_vnops uses this. */
struct cdevsw ctty_cdevsw = 
	{ cttyopen,	nullclose,	cttyread,	cttywrite,	/*1*/
	  cttyioctl,	nullstop,	nullreset,	nodevtotty,/* tty */
	  cttyselect,	nommap,		NULL,	"ctty",	NULL,	-1 };

#endif /* !NeXT */

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

/*ARGSUSED*/
int
cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
{
	struct vnode *ttyvp = cttyvp(p);
	struct vfs_context context;
	int error;

	if (ttyvp == NULL)
		return (ENXIO);

	context.vc_proc = p;
	context.vc_ucred = p->p_ucred;
	error = VNOP_OPEN(ttyvp, flag, &context);

	return (error);
}

/*ARGSUSED*/
int
cttyread(__unused dev_t dev, struct uio *uio, int flag)
{
	struct proc *p = current_proc();
	register struct vnode *ttyvp = cttyvp(p);
	struct vfs_context context;
	int error;

	if (ttyvp == NULL)
		return (EIO);

	context.vc_proc = p;
	context.vc_ucred = NOCRED;

	error = VNOP_READ(ttyvp, uio, flag, &context);

	return (error);
}

/*ARGSUSED*/
int
cttywrite(__unused dev_t dev, struct uio *uio, int flag)
{
	struct proc *p = current_proc();
	register struct vnode *ttyvp = cttyvp(p);
	struct vfs_context context;
	int error;

	if (ttyvp == NULL)
		return (EIO);

	context.vc_proc = p;
	context.vc_ucred = NOCRED;

	error = VNOP_WRITE(ttyvp, uio, flag, &context);

	return (error);
}

/*ARGSUSED*/
#ifndef NeXT
static	int
cttyioctl(dev, cmd, addr, flag, p)
	dev_t dev;
	int cmd;
	caddr_t addr;
	int flag;
	struct proc *p;
#else
int
cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
	struct proc *p)
#endif /* !NeXT */
{
	struct vnode *ttyvp = cttyvp(p);
	struct vfs_context context;

	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) {
		if (!SESS_LEADER(p)) {
			p->p_flag &= ~P_CONTROLT;
			return (0);
		} else
			return (EINVAL);
	}
	context.vc_proc = p;
	context.vc_ucred = NOCRED;

	return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
}

/*ARGSUSED*/
int
cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
{
	struct vnode *ttyvp = cttyvp(p);
	struct vfs_context context;

	context.vc_proc = p;
	context.vc_ucred = NOCRED;

	if (ttyvp == NULL)
		return (1);	/* try operation to get EOF/failure */
	return (VNOP_SELECT(ttyvp, flag, FREAD|FWRITE, wql, &context));
}

#ifndef NeXT
static ctty_devsw_installed = 0;
#ifdef DEVFS
static 	void	*ctty_devfs_token;
#endif

static void
ctty_drvinit(void *unused)
{
	dev_t dev;

	if( ! ctty_devsw_installed ) {
		dev = makedev(CDEV_MAJOR,0);
		cdevsw_add(&dev,&ctty_cdevsw,NULL);
		ctty_devsw_installed = 1;
#ifdef DEVFS
		ctty_devfs_token = 
			devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 
					0666, "tty");
#endif
    	}
}

SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)


#endif /* !NeXT */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
37839358 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
37839358 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	23	/*-
	24	* Copyright (c) 1982, 1986, 1991, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
	35	* 3. All advertising materials mentioning features or use of this software
	36	* must display the following acknowledgement:
	37	* This product includes software developed by the University of
	38	* California, Berkeley and its contributors.
	39	* 4. Neither the name of the University nor the names of its contributors
	40	* may be used to endorse or promote products derived from this software
	41	* without specific prior written permission.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	44	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	45	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	46	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	47	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	48	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	49	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	50	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	51	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	52	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	53	* SUCH DAMAGE.
	54	*
	55	* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
	56	*/
	57
	58	/*
	59	* Indirect driver for controlling tty.
	60	*/
	61	#include <sys/param.h>
	62	#include <sys/systm.h>
	63	#include <sys/conf.h>
	64	#include <sys/ioctl.h>
91447636	65	#include <sys/proc_internal.h>
1c79356b	66	#include <sys/tty.h>
91447636 A	67	#include <sys/vnode_internal.h>
91447636 A	68	#include <sys/file_internal.h>
1c79356b A	69	#ifndef NeXT
	70	#include <sys/kernel.h>
	71	#ifdef DEVFS
	72	#include <sys/devfsext.h>
	73	#endif /DEVFS/
	74
	75	static d_open_t cttyopen;
	76	static d_read_t cttyread;
	77	static d_write_t cttywrite;
	78	static d_ioctl_t cttyioctl;
	79	static d_select_t cttyselect;
	80
91447636 A	81	#endif /* !NeXT */
	82
	83	/* Forward declarations for cdevsw[] entry */
	84	/* XXX we should consider making these static */
	85	int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
	86	int cttyread(dev_t dev, struct uio *uio, int flag);
	87	int cttywrite(dev_t dev, struct uio *uio, int flag);
	88	int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
	89	int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);
	90
	91	#ifndef NeXT
	92
1c79356b A	93	#define CDEV_MAJOR 1
	94	/* Don't make static, fdesc_vnops uses this. */
	95	struct cdevsw ctty_cdevsw =
	96	{ cttyopen, nullclose, cttyread, cttywrite, /1/
	97	cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
	98	cttyselect, nommap, NULL, "ctty", NULL, -1 };
	99
	100	#endif /* !NeXT */
	101
	102	#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
	103
	104	/ARGSUSED/
	105	int
91447636	106	cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
1c79356b A	107	{
1c79356b A	108	struct vnode *ttyvp = cttyvp(p);
91447636	109	struct vfs_context context;
1c79356b A	110	int error;
	111
	112	if (ttyvp == NULL)
	113	return (ENXIO);
1c79356b	114
91447636 A	115	context.vc_proc = p;
	116	context.vc_ucred = p->p_ucred;
	117	error = VNOP_OPEN(ttyvp, flag, &context);
	118
1c79356b A	119	return (error);
	120	}
	121
	122	/ARGSUSED/
	123	int
91447636	124	cttyread(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	125	{
91447636 A	126	struct proc *p = current_proc();
	127	register struct vnode *ttyvp = cttyvp(p);
	128	struct vfs_context context;
1c79356b A	129	int error;
	130
	131	if (ttyvp == NULL)
	132	return (EIO);
91447636 A	133
	134	context.vc_proc = p;
	135	context.vc_ucred = NOCRED;
	136
	137	error = VNOP_READ(ttyvp, uio, flag, &context);
	138
1c79356b A	139	return (error);
	140	}
	141
	142	/ARGSUSED/
	143	int
91447636	144	cttywrite(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	145	{
91447636 A	146	struct proc *p = current_proc();
	147	register struct vnode *ttyvp = cttyvp(p);
	148	struct vfs_context context;
1c79356b A	149	int error;
	150
	151	if (ttyvp == NULL)
	152	return (EIO);
91447636 A	153
	154	context.vc_proc = p;
	155	context.vc_ucred = NOCRED;
	156
	157	error = VNOP_WRITE(ttyvp, uio, flag, &context);
	158
1c79356b A	159	return (error);
	160	}
	161
	162	/ARGSUSED/
	163	#ifndef NeXT
	164	static int
	165	cttyioctl(dev, cmd, addr, flag, p)
	166	dev_t dev;
	167	int cmd;
	168	caddr_t addr;
	169	int flag;
	170	struct proc *p;
	171	#else
	172	int
91447636 A	173	cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
91447636 A	174	struct proc *p)
1c79356b A	175	#endif /* !NeXT */
	176	{
	177	struct vnode *ttyvp = cttyvp(p);
91447636	178	struct vfs_context context;
1c79356b A	179
	180	if (ttyvp == NULL)
	181	return (EIO);
	182	if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
	183	return EINVAL; /* to controlling tty -- infinite recursion */
	184	if (cmd == TIOCNOTTY) {
	185	if (!SESS_LEADER(p)) {
	186	p->p_flag &= ~P_CONTROLT;
	187	return (0);
	188	} else
	189	return (EINVAL);
	190	}
91447636 A	191	context.vc_proc = p;
	192	context.vc_ucred = NOCRED;
	193
	194	return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
1c79356b A	195	}
	196
	197	/ARGSUSED/
	198	int
91447636	199	cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
1c79356b A	200	{
1c79356b A	201	struct vnode *ttyvp = cttyvp(p);
91447636 A	202	struct vfs_context context;
	203
	204	context.vc_proc = p;
	205	context.vc_ucred = NOCRED;
1c79356b A	206
	207	if (ttyvp == NULL)
	208	return (1); /* try operation to get EOF/failure */
91447636	209	return (VNOP_SELECT(ttyvp, flag, FREAD\|FWRITE, wql, &context));
1c79356b A	210	}
	211
	212	#ifndef NeXT
	213	static ctty_devsw_installed = 0;
	214	#ifdef DEVFS
	215	static void *ctty_devfs_token;
	216	#endif
	217
	218	static void
	219	ctty_drvinit(void *unused)
	220	{
	221	dev_t dev;
	222
	223	if( ! ctty_devsw_installed ) {
	224	dev = makedev(CDEV_MAJOR,0);
	225	cdevsw_add(&dev,&ctty_cdevsw,NULL);
	226	ctty_devsw_installed = 1;
	227	#ifdef DEVFS
	228	ctty_devfs_token =
	229	devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
	230	0666, "tty");
	231	#endif
	232	}
	233	}
	234
	235	SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
	236
	237
	238	#endif /* !NeXT */