/*-

 * Copyright (c) 1982, 1986, 1990, 1993, 1994

 *	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.

 * 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.

 *

 *	@(#)ioccom.h	8.2 (Berkeley) 3/28/94

 * $FreeBSD: src/sys/sys/ioccom.h,v 1.15 2004/04/07 04:19:49 imp Exp $

 */

#ifndef	_SYS_IOCCOM_H_

#define	_SYS_IOCCOM_H_

/*

 * Ioctl's have the command encoded in the lower word, and the size of

 * any in or out parameters in the upper word.  The high 3 bits of the

 * upper word are used to encode the in/out status of the parameter.

 */

#define	IOCPARM_MASK	0x1fff		/* parameter length, at most 13 bits */

#define	IOCPARM_LEN(x)	(((x) >> 16) & IOCPARM_MASK)

#define	IOCBASECMD(x)	((x) & ~(IOCPARM_MASK << 16))

#define	IOCGROUP(x)	(((x) >> 8) & 0xff)

#define	IOCPARM_MAX	PAGE_SIZE		/* max size of ioctl, mult. of PAGE_SIZE */

#define	IOC_VOID	0x20000000	/* no parameters */

#define	IOC_OUT		0x40000000	/* copy out parameters */

#define	IOC_IN		0x80000000	/* copy in parameters */

#define	IOC_INOUT	(IOC_IN|IOC_OUT)

#define	IOC_DIRMASK	0xe0000000	/* mask for IN/OUT/VOID */

#define	_IOC(inout,group,num,len) \

	((unsigned long)(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))

#define	_IO(g,n)	_IOC(IOC_VOID,	(g), (n), 0)

#define	_IOR(g,n,t)	_IOC(IOC_OUT,	(g), (n), sizeof(t))

#define	_IOW(g,n,t)	_IOC(IOC_IN,	(g), (n), sizeof(t))

/* this should be _IORW, but stdio got there first */

#define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))

#ifndef _KERNEL

#include <sys/cdefs.h>

__BEGIN_DECLS

IMPORT_C int	ioctl(int, unsigned long, ...);

__END_DECLS

#endif

#endif /* !_SYS_IOCCOM_H_ */