1 /*- 2 * Copyright (c) 1982, 1986, 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)ioccom.h 8.2 (Berkeley) 3/28/94 34 * $Id: ioccom.h,v 1.1 1994/05/21 03:51:59 cgd Exp $ 35 */ 36 37 #ifndef _SYS_IOCCOM_H_ 38 #define _SYS_IOCCOM_H_ 39 40 /* 41 * Ioctl's have the command encoded in the lower word, and the size of 42 * any in or out parameters in the upper word. The high 3 bits of the 43 * upper word are used to encode the in/out status of the parameter. 44 */ 45 #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */ 46 #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK) 47 #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16)) 48 #define IOCGROUP(x) (((x) >> 8) & 0xff) 49 50 #define IOCPARM_MAX NBPG /* max size of ioctl, mult. of NBPG */ 51 #define IOC_VOID 0x20000000 /* no parameters */ 52 #define IOC_OUT 0x40000000 /* copy out parameters */ 53 #define IOC_IN 0x80000000 /* copy in parameters */ 54 #define IOC_INOUT (IOC_IN|IOC_OUT) 55 #define IOC_DIRMASK 0xe0000000 /* mask for IN/OUT/VOID */ 56 57 #define _IOC(inout,group,num,len) \ 58 (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)) 59 #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0) 60 #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t)) 61 #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t)) 62 /* this should be _IORW, but stdio got there first */ 63 #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t)) 64 65 #endif /* !_SYS_IOCCOM_H_ */ 66