1 //==========================================================================
3 // include/sys/ioccom.h
7 //==========================================================================
8 //####BSDCOPYRIGHTBEGIN####
10 // -------------------------------------------
12 // Portions of this software may have been derived from OpenBSD or other sources,
13 // and are covered by the appropriate copyright disclaimers included herein.
15 // -------------------------------------------
17 //####BSDCOPYRIGHTEND####
18 //==========================================================================
19 //#####DESCRIPTIONBEGIN####
22 // Contributors: gthomas
28 //####DESCRIPTIONEND####
30 //==========================================================================
33 /* $OpenBSD: ioccom.h,v 1.2 1996/03/03 12:11:49 niklas Exp $ */
34 /* $NetBSD: ioccom.h,v 1.4 1994/10/30 21:49:56 cgd Exp $ */
37 * Copyright (c) 1982, 1986, 1990, 1993, 1994
38 * The Regents of the University of California. All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by the University of
51 * California, Berkeley and its contributors.
52 * 4. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68 * @(#)ioccom.h 8.2 (Berkeley) 3/28/94
71 #ifndef _SYS_IOCCOM_H_
72 #define _SYS_IOCCOM_H_
75 * Ioctl's have the command encoded in the lower word, and the size of
76 * any in or out parameters in the upper word. The high 3 bits of the
77 * upper word are used to encode the in/out status of the parameter.
79 #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */
80 #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
81 #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
82 #define IOCGROUP(x) (((x) >> 8) & 0xff)
85 #define IOCPARM_MAX NBPG /* max size of ioctl args, mult. of NBPG */
88 #define IOC_VOID (unsigned long)0x20000000
89 /* copy parameters out */
90 #define IOC_OUT (unsigned long)0x40000000
91 /* copy parameters in */
92 #define IOC_IN (unsigned long)0x80000000
93 /* copy paramters in and out */
94 #define IOC_INOUT (IOC_IN|IOC_OUT)
95 /* mask for IN/OUT/VOID */
96 #define IOC_DIRMASK (unsigned long)0xe0000000
98 #define _IOC(inout,group,num,len) \
99 (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
100 #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
101 #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
102 #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t))
103 /* this should be _IORW, but stdio got there first */
104 #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
106 #endif /* !_SYS_IOCCOM_H_ */