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