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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_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	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8ad349bb	4	* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
1c79356b	5	*
8ad349bb A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the
	10	* License may not be used to create, or enable the creation or
	11	* redistribution of, unlawful or unlicensed copies of an Apple operating
	12	* system, or to circumvent, violate, or enable the circumvention or
	13	* violation of, any terms of an Apple operating system software license
	14	* agreement.
	15	*
	16	* Please obtain a copy of the License at
	17	* http://www.opensource.apple.com/apsl/ and read it before using this
	18	* file.
	19	*
	20	* The Original Code and all software distributed under the License are
	21	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	22	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	23	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	25	* Please see the License for the specific language governing rights and
	26	* limitations under the License.
	27	*
	28	* @APPLE_LICENSE_OSREFERENCE_HEADER_END@
1c79356b A	29	*/
	30	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	31	/*-
	32	* Copyright (c) 1982, 1986, 1991, 1993
	33	* The Regents of the University of California. All rights reserved.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*
	63	* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
	64	*/
	65
	66	/*
	67	* Indirect driver for controlling tty.
	68	*/
	69	#include <sys/param.h>
	70	#include <sys/systm.h>
	71	#include <sys/conf.h>
	72	#include <sys/ioctl.h>
91447636	73	#include <sys/proc_internal.h>
1c79356b	74	#include <sys/tty.h>
91447636 A	75	#include <sys/vnode_internal.h>
91447636 A	76	#include <sys/file_internal.h>
1c79356b A	77	#ifndef NeXT
	78	#include <sys/kernel.h>
	79	#ifdef DEVFS
	80	#include <sys/devfsext.h>
	81	#endif /DEVFS/
	82
	83	static d_open_t cttyopen;
	84	static d_read_t cttyread;
	85	static d_write_t cttywrite;
	86	static d_ioctl_t cttyioctl;
	87	static d_select_t cttyselect;
	88
91447636 A	89	#endif /* !NeXT */
	90
	91	/* Forward declarations for cdevsw[] entry */
	92	/* XXX we should consider making these static */
	93	int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
	94	int cttyread(dev_t dev, struct uio *uio, int flag);
	95	int cttywrite(dev_t dev, struct uio *uio, int flag);
	96	int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
	97	int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);
	98
	99	#ifndef NeXT
	100
1c79356b A	101	#define CDEV_MAJOR 1
	102	/* Don't make static, fdesc_vnops uses this. */
	103	struct cdevsw ctty_cdevsw =
	104	{ cttyopen, nullclose, cttyread, cttywrite, /1/
	105	cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
	106	cttyselect, nommap, NULL, "ctty", NULL, -1 };
	107
	108	#endif /* !NeXT */
	109
	110	#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
	111
	112	/ARGSUSED/
	113	int
91447636	114	cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
1c79356b A	115	{
1c79356b A	116	struct vnode *ttyvp = cttyvp(p);
91447636	117	struct vfs_context context;
1c79356b A	118	int error;
	119
	120	if (ttyvp == NULL)
	121	return (ENXIO);
1c79356b	122
91447636 A	123	context.vc_proc = p;
	124	context.vc_ucred = p->p_ucred;
	125	error = VNOP_OPEN(ttyvp, flag, &context);
	126
1c79356b A	127	return (error);
	128	}
	129
	130	/ARGSUSED/
	131	int
91447636	132	cttyread(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	133	{
91447636 A	134	struct proc *p = current_proc();
	135	register struct vnode *ttyvp = cttyvp(p);
	136	struct vfs_context context;
1c79356b A	137	int error;
	138
	139	if (ttyvp == NULL)
	140	return (EIO);
91447636 A	141
	142	context.vc_proc = p;
	143	context.vc_ucred = NOCRED;
	144
	145	error = VNOP_READ(ttyvp, uio, flag, &context);
	146
1c79356b A	147	return (error);
	148	}
	149
	150	/ARGSUSED/
	151	int
91447636	152	cttywrite(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	153	{
91447636 A	154	struct proc *p = current_proc();
	155	register struct vnode *ttyvp = cttyvp(p);
	156	struct vfs_context context;
1c79356b A	157	int error;
	158
	159	if (ttyvp == NULL)
	160	return (EIO);
91447636 A	161
	162	context.vc_proc = p;
	163	context.vc_ucred = NOCRED;
	164
	165	error = VNOP_WRITE(ttyvp, uio, flag, &context);
	166
1c79356b A	167	return (error);
	168	}
	169
	170	/ARGSUSED/
	171	#ifndef NeXT
	172	static int
	173	cttyioctl(dev, cmd, addr, flag, p)
	174	dev_t dev;
	175	int cmd;
	176	caddr_t addr;
	177	int flag;
	178	struct proc *p;
	179	#else
	180	int
91447636 A	181	cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
91447636 A	182	struct proc *p)
1c79356b A	183	#endif /* !NeXT */
	184	{
	185	struct vnode *ttyvp = cttyvp(p);
91447636	186	struct vfs_context context;
1c79356b A	187
	188	if (ttyvp == NULL)
	189	return (EIO);
	190	if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
	191	return EINVAL; /* to controlling tty -- infinite recursion */
	192	if (cmd == TIOCNOTTY) {
	193	if (!SESS_LEADER(p)) {
	194	p->p_flag &= ~P_CONTROLT;
	195	return (0);
	196	} else
	197	return (EINVAL);
	198	}
91447636 A	199	context.vc_proc = p;
	200	context.vc_ucred = NOCRED;
	201
	202	return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
1c79356b A	203	}
	204
	205	/ARGSUSED/
	206	int
91447636	207	cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
1c79356b A	208	{
1c79356b A	209	struct vnode *ttyvp = cttyvp(p);
91447636 A	210	struct vfs_context context;
	211
	212	context.vc_proc = p;
	213	context.vc_ucred = NOCRED;
1c79356b A	214
	215	if (ttyvp == NULL)
	216	return (1); /* try operation to get EOF/failure */
91447636	217	return (VNOP_SELECT(ttyvp, flag, FREAD\|FWRITE, wql, &context));
1c79356b A	218	}
	219
	220	#ifndef NeXT
	221	static ctty_devsw_installed = 0;
	222	#ifdef DEVFS
	223	static void *ctty_devfs_token;
	224	#endif
	225
	226	static void
	227	ctty_drvinit(void *unused)
	228	{
	229	dev_t dev;
	230
	231	if( ! ctty_devsw_installed ) {
	232	dev = makedev(CDEV_MAJOR,0);
	233	cdevsw_add(&dev,&ctty_cdevsw,NULL);
	234	ctty_devsw_installed = 1;
	235	#ifdef DEVFS
	236	ctty_devfs_token =
	237	devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
	238	0666, "tty");
	239	#endif
	240	}
	241	}
	242
	243	SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
	244
	245
	246	#endif /* !NeXT */