www.pudn.com > tcpipsim.rar > ioccom.h

/*- 
 * 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. 
 * 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. 
 * 
 *	@(#)ioccom.h	8.2 (Berkeley) 3/28/94 
 */ 
 
#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	NBPG		/* max size of ioctl, mult. of NBPG */ 
#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) \ 
	(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)) 
 
#endif /* !_SYS_IOCCOM_H_ */