sl@0: /*-
sl@0:  * Copyright (c) 1982, 1986, 1990, 1993, 1994
sl@0:  *	The Regents of the University of California.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 4. Neither the name of the University nor the names of its contributors
sl@0:  *    may be used to endorse or promote products derived from this software
sl@0:  *    without specific prior written permission.
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  *
sl@0:  *	@(#)ioccom.h	8.2 (Berkeley) 3/28/94
sl@0:  * $FreeBSD: src/sys/sys/ioccom.h,v 1.15 2004/04/07 04:19:49 imp Exp $
sl@0:  */
sl@0: 
sl@0: #ifndef	_SYS_IOCCOM_H_
sl@0: #define	_SYS_IOCCOM_H_
sl@0: 
sl@0: /*
sl@0:  * Ioctl's have the command encoded in the lower word, and the size of
sl@0:  * any in or out parameters in the upper word.  The high 3 bits of the
sl@0:  * upper word are used to encode the in/out status of the parameter.
sl@0:  */
sl@0: #define	IOCPARM_MASK	0x1fff		/* parameter length, at most 13 bits */
sl@0: #define	IOCPARM_LEN(x)	(((x) >> 16) & IOCPARM_MASK)
sl@0: #define	IOCBASECMD(x)	((x) & ~(IOCPARM_MASK << 16))
sl@0: #define	IOCGROUP(x)	(((x) >> 8) & 0xff)
sl@0: 
sl@0: #define	IOCPARM_MAX	PAGE_SIZE		/* max size of ioctl, mult. of PAGE_SIZE */
sl@0: #define	IOC_VOID	0x20000000	/* no parameters */
sl@0: #define	IOC_OUT		0x40000000	/* copy out parameters */
sl@0: #define	IOC_IN		0x80000000	/* copy in parameters */
sl@0: #define	IOC_INOUT	(IOC_IN|IOC_OUT)
sl@0: #define	IOC_DIRMASK	0xe0000000	/* mask for IN/OUT/VOID */
sl@0: 
sl@0: #define	_IOC(inout,group,num,len) \
sl@0: 	((unsigned long)(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
sl@0: #define	_IO(g,n)	_IOC(IOC_VOID,	(g), (n), 0)
sl@0: #define	_IOR(g,n,t)	_IOC(IOC_OUT,	(g), (n), sizeof(t))
sl@0: #define	_IOW(g,n,t)	_IOC(IOC_IN,	(g), (n), sizeof(t))
sl@0: /* this should be _IORW, but stdio got there first */
sl@0: #define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))
sl@0: 
sl@0: #ifndef _KERNEL
sl@0: 
sl@0: #include <sys/cdefs.h>
sl@0: 
sl@0: __BEGIN_DECLS
sl@0: IMPORT_C int	ioctl(int, unsigned long, ...);
sl@0: __END_DECLS
sl@0: 
sl@0: #endif
sl@0: 
sl@0: #endif /* !_SYS_IOCCOM_H_ */