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619fe09586
Its use is for cases where some filler is needed for cmd, or we need an indication that there were no cmd supplied, and so on. Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29935
95 lines
3.9 KiB
C
95 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ioccom.h 8.3 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _SYS_IOCCOM_H_
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#define _SYS_IOCCOM_H_
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/*
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* Ioctl's have the command encoded in the lower word, and the size of
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* any in or out parameters in the upper word. The high 3 bits of the
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* upper word are used to encode the in/out status of the parameter.
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*
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* 31 29 28 16 15 8 7 0
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* +---------------------------------------------------------------+
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* | I/O | Parameter Length | Command Group | Command |
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* +---------------------------------------------------------------+
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*/
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#define IOCPARM_SHIFT 13 /* number of bits for ioctl size */
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#define IOCPARM_MASK ((1 << IOCPARM_SHIFT) - 1) /* parameter length mask */
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#define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
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#define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
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#define IOCGROUP(x) (((x) >> 8) & 0xff)
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#define IOCPARM_MAX (1 << IOCPARM_SHIFT) /* max size of ioctl */
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#define IOC_VOID 0x20000000UL /* no parameters */
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#define IOC_OUT 0x40000000UL /* copy out parameters */
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#define IOC_IN 0x80000000UL /* copy in parameters */
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#define IOC_INOUT (IOC_IN|IOC_OUT)/* copy parameters in and out */
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#define IOC_DIRMASK (IOC_VOID|IOC_OUT|IOC_IN)/* mask for IN/OUT/VOID */
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#define _IOC(inout,group,num,len) ((unsigned long) \
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((inout) | (((len) & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
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#define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
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#define _IOWINT(g,n) _IOC(IOC_VOID, (g), (n), sizeof(int))
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#define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
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#define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t))
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/* this should be _IORW, but stdio got there first */
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#define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
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/* Replace length/type in an ioctl command. */
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#define _IOC_NEWLEN(ioc, len) \
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(((~(IOCPARM_MASK << 16)) & (ioc)) | (((len) & IOCPARM_MASK) << 16))
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#define _IOC_NEWTYPE(ioc, type) _IOC_NEWLEN((ioc), sizeof(type))
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#ifdef _KERNEL
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#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
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defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
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#define IOCPARM_IVAL(x) ((int)(intptr_t)(void *)*(caddr_t *)(void *)(x))
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#endif
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#define _IOC_INVALID (_IOC_VOID|_IOC_INOUT) /* Never valid cmd value,
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use as filler */
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#else
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int ioctl(int, unsigned long, ...);
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__END_DECLS
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#endif
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#endif /* !_SYS_IOCCOM_H_ */
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