Annotation of sys/sys/ioccom.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ioccom.h,v 1.4 2006/05/18 21:27:25 miod 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 NBPG /* max size of ioctl args, mult. of NBPG */
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_ */
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