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41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
#pragma once
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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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#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 0x20000000 /* no parameters */
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#define IOC_OUT 0x40000000 /* copy out parameters */
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#define IOC_IN 0x80000000 /* copy in parameters */
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#define IOC_INOUT (IOC_IN|IOC_OUT)
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#define IOC_DIRMASK (IOC_VOID|IOC_OUT|IOC_IN)
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#define _IOC(inout,group,num,len) ((int) \
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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int ioctl(int fd,
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int request,
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...);
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#ifdef __cplusplus
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}
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#endif
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