1/* $OpenBSD: ioccom.h,v 1.6 2025/05/02 10:14:46 jsg 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 0x20000000UL
51 /* copy parameters out */
52#define IOC_OUT 0x40000000UL
53 /* copy parameters in */
54#define IOC_IN 0x80000000UL
55 /* copy parameters in and out */
56#define IOC_INOUT (IOC_IN|IOC_OUT)
57 /* mask for IN/OUT/VOID */
58#define IOC_DIRMASK 0xe0000000UL
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_ */