minix/common/include/sys/ioccom.h

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/* $NetBSD: ioccom.h,v 1.11 2011/10/19 10:53:12 yamt Exp $ */
/*-
* 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. 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 8.3 (Berkeley) 1/9/95
*/
#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.
*
* 31 29 28 16 15 8 7 0
* +---------------------------------------------------------------+
* | I/O | Parameter Length | Command Group | Command |
* +---------------------------------------------------------------+
*/
#define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */
#define IOCPARM_SHIFT 16
#define IOCGROUP_SHIFT 8
#define IOCPARM_LEN(x) (((x) >> IOCPARM_SHIFT) & IOCPARM_MASK)
#define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << IOCPARM_SHIFT))
#define IOCGROUP(x) (((x) >> IOCGROUP_SHIFT) & 0xff)
#define IOCPARM_MAX NBPG /* max size of ioctl args, mult. of NBPG */
/* no parameters */
#define IOC_VOID (unsigned long)0x20000000
/* copy parameters out */
#define IOC_OUT (unsigned long)0x40000000
/* copy parameters in */
#define IOC_IN (unsigned long)0x80000000
/* copy parameters in and out */
#define IOC_INOUT (IOC_IN|IOC_OUT)
/* mask for IN/OUT/VOID */
#define IOC_DIRMASK (unsigned long)0xe0000000
#define _IOC(inout, group, num, len) \
((inout) | (((len) & IOCPARM_MASK) << IOCPARM_SHIFT) | \
((group) << IOCGROUP_SHIFT) | (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_ */