| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /* $NetBSD: ioccom.h,v 1.8 2005/12/11 12:25:20 christos Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1982, 1986, 1990, 1993, 1994
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | *
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| 31 | * @(#)ioccom.h 8.3 (Berkeley) 1/9/95
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| 32 | */
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| 33 | #ifndef _SYS_IOCCOM_H_
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| 34 | #define _SYS_IOCCOM_H_
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| 35 |
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| 36 | /*
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| 37 | * Ioctl's have the command encoded in the lower word, and the size of
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| 38 | * any in or out parameters in the upper word. The high 3 bits of the
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| 39 | * upper word are used to encode the in/out status of the parameter.
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| 40 | */
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| 41 | #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */
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| 42 |
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| 43 | #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
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| 44 | #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
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| 45 | #define IOCGROUP(x) (((x) >> 8) & 0xff)
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| 46 |
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| 47 | #define IOCPARM_MAX NBPG /* max size of ioctl args, mult. of NBPG */
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| 48 | /* no parameters */
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| 49 | #define IOC_VOID (unsigned long)0x20000000
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| 50 | /* copy parameters out */
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| 51 | #define IOC_OUT (unsigned long)0x40000000
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| 52 | /* copy parameters in */
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| 53 | #define IOC_IN (unsigned long)0x80000000
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| 54 | /* copy parameters in and out */
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| 55 | #define IOC_INOUT (IOC_IN|IOC_OUT)
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| 56 | /* mask for IN/OUT/VOID */
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| 57 | #define IOC_DIRMASK (unsigned long)0xe0000000
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| 58 |
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| 59 | #define _IOC(inout,group,num,len) (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
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| 60 |
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| 61 | #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
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| 62 | #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
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| 63 | #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t))
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| 64 |
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| 65 | /* this should be _IORW, but stdio got there first */
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| 66 | #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
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| 67 |
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| 68 | #endif /* !_SYS_IOCCOM_H_ */
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