1 /* $OpenBSD: ioccom.h,v 1.5 2013/03/22 21:22:05 deraadt Exp $ */ 2 /* $NetBSD: ioccom.h,v 1.4 1994/10/30 21:49:56 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1982, 1986, 1990, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ioccom.h 8.2 (Berkeley) 3/28/94 33 */ 34 35 #ifndef _SYS_IOCCOM_H_ 36 #define _SYS_IOCCOM_H_ 37 38 /* 39 * Ioctl's have the command encoded in the lower word, and the size of 40 * any in or out parameters in the upper word. The high 3 bits of the 41 * upper word are used to encode the in/out status of the parameter. 42 */ 43 #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */ 44 #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK) 45 #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16)) 46 #define IOCGROUP(x) (((x) >> 8) & 0xff) 47 48 #define IOCPARM_MAX PAGE_SIZE /* max size of ioctl args */ 49 /* no parameters */ 50 #define IOC_VOID (unsigned long)0x20000000 51 /* copy parameters out */ 52 #define IOC_OUT (unsigned long)0x40000000 53 /* copy parameters in */ 54 #define IOC_IN (unsigned long)0x80000000 55 /* copy parameters in and out */ 56 #define IOC_INOUT (IOC_IN|IOC_OUT) 57 /* mask for IN/OUT/VOID */ 58 #define IOC_DIRMASK (unsigned long)0xe0000000 59 60 #define _IOC(inout,group,num,len) \ 61 (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)) 62 #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0) 63 #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t)) 64 #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t)) 65 /* this should be _IORW, but stdio got there first */ 66 #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t)) 67 68 #endif /* !_SYS_IOCCOM_H_ */ 69