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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_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_OSREFERENCE_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	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 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 License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
	29	/*-
	30	* Copyright (c) 1982, 1986, 1991, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	*
	33	* Redistribution and use in source and binary forms, with or without
	34	* modification, are permitted provided that the following conditions
	35	* are met:
	36	* 1. Redistributions of source code must retain the above copyright
	37	* notice, this list of conditions and the following disclaimer.
	38	* 2. Redistributions in binary form must reproduce the above copyright
	39	* notice, this list of conditions and the following disclaimer in the
	40	* documentation and/or other materials provided with the distribution.
	41	* 3. All advertising materials mentioning features or use of this software
	42	* must display the following acknowledgement:
	43	* This product includes software developed by the University of
	44	* California, Berkeley and its contributors.
	45	* 4. Neither the name of the University nor the names of its contributors
	46	* may be used to endorse or promote products derived from this software
	47	* without specific prior written permission.
	48	*
	49	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	50	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	51	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	52	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	53	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	54	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	55	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	56	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	57	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	58	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	59	* SUCH DAMAGE.
	60	*
	61	* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
	62	*/
	63
	64	/*
	65	* Indirect driver for controlling tty.
	66	*/
	67	#include <sys/param.h>
	68	#include <sys/systm.h>
	69	#include <sys/conf.h>
	70	#include <sys/ioctl.h>
91447636	71	#include <sys/proc_internal.h>
1c79356b	72	#include <sys/tty.h>
91447636 A	73	#include <sys/vnode_internal.h>
91447636 A	74	#include <sys/file_internal.h>
1c79356b A	75	#ifndef NeXT
	76	#include <sys/kernel.h>
	77	#ifdef DEVFS
	78	#include <sys/devfsext.h>
	79	#endif /DEVFS/
	80
	81	static d_open_t cttyopen;
	82	static d_read_t cttyread;
	83	static d_write_t cttywrite;
	84	static d_ioctl_t cttyioctl;
	85	static d_select_t cttyselect;
	86
91447636 A	87	#endif /* !NeXT */
	88
	89	/* Forward declarations for cdevsw[] entry */
	90	/* XXX we should consider making these static */
	91	int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
	92	int cttyread(dev_t dev, struct uio *uio, int flag);
	93	int cttywrite(dev_t dev, struct uio *uio, int flag);
	94	int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
	95	int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);
	96
	97	#ifndef NeXT
	98
1c79356b A	99	#define CDEV_MAJOR 1
	100	/* Don't make static, fdesc_vnops uses this. */
	101	struct cdevsw ctty_cdevsw =
	102	{ cttyopen, nullclose, cttyread, cttywrite, /1/
	103	cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
	104	cttyselect, nommap, NULL, "ctty", NULL, -1 };
	105
	106	#endif /* !NeXT */
	107
	108	#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
	109
	110	/ARGSUSED/
	111	int
91447636	112	cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
1c79356b A	113	{
1c79356b A	114	struct vnode *ttyvp = cttyvp(p);
91447636	115	struct vfs_context context;
1c79356b A	116	int error;
	117
	118	if (ttyvp == NULL)
	119	return (ENXIO);
1c79356b	120
91447636	121	context.vc_proc = p;
21362eb3	122	context.vc_ucred = p->p_ucred;
91447636 A	123	error = VNOP_OPEN(ttyvp, flag, &context);
91447636 A	124
1c79356b A	125	return (error);
	126	}
	127
	128	/ARGSUSED/
	129	int
91447636	130	cttyread(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	131	{
91447636 A	132	struct proc *p = current_proc();
	133	register struct vnode *ttyvp = cttyvp(p);
	134	struct vfs_context context;
1c79356b A	135	int error;
	136
	137	if (ttyvp == NULL)
	138	return (EIO);
91447636 A	139
	140	context.vc_proc = p;
	141	context.vc_ucred = NOCRED;
	142
	143	error = VNOP_READ(ttyvp, uio, flag, &context);
	144
1c79356b A	145	return (error);
	146	}
	147
	148	/ARGSUSED/
	149	int
91447636	150	cttywrite(__unused dev_t dev, struct uio *uio, int flag)
1c79356b	151	{
91447636 A	152	struct proc *p = current_proc();
	153	register struct vnode *ttyvp = cttyvp(p);
	154	struct vfs_context context;
1c79356b A	155	int error;
	156
	157	if (ttyvp == NULL)
	158	return (EIO);
91447636 A	159
	160	context.vc_proc = p;
	161	context.vc_ucred = NOCRED;
	162
	163	error = VNOP_WRITE(ttyvp, uio, flag, &context);
	164
1c79356b A	165	return (error);
	166	}
	167
	168	/ARGSUSED/
	169	#ifndef NeXT
	170	static int
	171	cttyioctl(dev, cmd, addr, flag, p)
	172	dev_t dev;
	173	int cmd;
	174	caddr_t addr;
	175	int flag;
	176	struct proc *p;
	177	#else
	178	int
91447636 A	179	cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
91447636 A	180	struct proc *p)
1c79356b A	181	#endif /* !NeXT */
	182	{
	183	struct vnode *ttyvp = cttyvp(p);
91447636	184	struct vfs_context context;
1c79356b A	185
	186	if (ttyvp == NULL)
	187	return (EIO);
	188	if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
	189	return EINVAL; /* to controlling tty -- infinite recursion */
	190	if (cmd == TIOCNOTTY) {
	191	if (!SESS_LEADER(p)) {
	192	p->p_flag &= ~P_CONTROLT;
	193	return (0);
	194	} else
	195	return (EINVAL);
	196	}
91447636 A	197	context.vc_proc = p;
	198	context.vc_ucred = NOCRED;
	199
	200	return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
1c79356b A	201	}
	202
	203	/ARGSUSED/
	204	int
91447636	205	cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
1c79356b A	206	{
1c79356b A	207	struct vnode *ttyvp = cttyvp(p);
91447636 A	208	struct vfs_context context;
	209
	210	context.vc_proc = p;
	211	context.vc_ucred = NOCRED;
1c79356b A	212
	213	if (ttyvp == NULL)
	214	return (1); /* try operation to get EOF/failure */
91447636	215	return (VNOP_SELECT(ttyvp, flag, FREAD\|FWRITE, wql, &context));
1c79356b A	216	}
	217
	218	#ifndef NeXT
	219	static ctty_devsw_installed = 0;
	220	#ifdef DEVFS
	221	static void *ctty_devfs_token;
	222	#endif
	223
	224	static void
	225	ctty_drvinit(void *unused)
	226	{
	227	dev_t dev;
	228
	229	if( ! ctty_devsw_installed ) {
	230	dev = makedev(CDEV_MAJOR,0);
	231	cdevsw_add(&dev,&ctty_cdevsw,NULL);
	232	ctty_devsw_installed = 1;
	233	#ifdef DEVFS
	234	ctty_devfs_token =
	235	devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
	236	0666, "tty");
	237	#endif
	238	}
	239	}
	240
	241	SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
	242
	243
	244	#endif /* !NeXT */