69 lines
3.0 KiB
C
69 lines
3.0 KiB
C
/* $OpenBSD: ioccom.h,v 1.5 2013/03/22 21:22:05 deraadt Exp $ */
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/* $NetBSD: ioccom.h,v 1.4 1994/10/30 21:49:56 cgd Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ioccom.h 8.2 (Berkeley) 3/28/94
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*/
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#ifndef _SYS_IOCCOM_H_
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#define _SYS_IOCCOM_H_
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/*
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* Ioctl's have the command encoded in the lower word, and the size of
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* any in or out parameters in the upper word. The high 3 bits of the
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* upper word are used to encode the in/out status of the parameter.
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*/
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#define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */
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#define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
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#define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
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#define IOCGROUP(x) (((x) >> 8) & 0xff)
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#define IOCPARM_MAX PAGE_SIZE /* max size of ioctl args */
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/* no parameters */
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#define IOC_VOID (unsigned long)0x20000000
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/* copy parameters out */
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#define IOC_OUT (unsigned long)0x40000000
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/* copy parameters in */
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#define IOC_IN (unsigned long)0x80000000
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/* copy parameters in and out */
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#define IOC_INOUT (IOC_IN|IOC_OUT)
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/* mask for IN/OUT/VOID */
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#define IOC_DIRMASK (unsigned long)0xe0000000
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#define _IOC(inout,group,num,len) \
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(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
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#define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
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#define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
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#define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t))
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/* this should be _IORW, but stdio got there first */
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#define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
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#endif /* !_SYS_IOCCOM_H_ */
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