| 1 | /* minix/ioctl.h - Ioctl helper definitions. Author: Kees J. Bot
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| 2 | * 23 Nov 2002
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| 3 | *
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| 4 | * This file is included by every header file that defines ioctl codes.
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| 5 | */
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| 6 |
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| 7 | #ifndef _M_IOCTL_H
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| 8 | #define _M_IOCTL_H
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| 9 |
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| 10 | #ifndef _TYPES_H
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| 11 | #include <sys/types.h>
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| 12 | #endif
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| 13 |
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| 14 | #if _EM_WSIZE >= 4
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| 15 | /* Ioctls have the command encoded in the low-order word, and the size
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| 16 | * of the parameter in the high-order word. The 3 high bits of the high-
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| 17 | * order word are used to encode the in/out/void status of the parameter.
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| 18 | */
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| 19 | #define _IOCPARM_MASK 0x1FFF
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| 20 | #define _IOC_VOID 0x20000000
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| 21 | #define _IOCTYPE_MASK 0xFFFF
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| 22 | #define _IOC_IN 0x40000000
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| 23 | #define _IOC_OUT 0x80000000
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| 24 | #define _IOC_INOUT (_IOC_IN | _IOC_OUT)
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| 25 |
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| 26 | #define _IO(x,y) ((x << 8) | y | _IOC_VOID)
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| 27 | #define _IOR(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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| 28 | _IOC_OUT)
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| 29 | #define _IOW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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| 30 | _IOC_IN)
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| 31 | #define _IORW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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| 32 | _IOC_INOUT)
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| 33 | #else
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| 34 | /* No fancy encoding on a 16-bit machine. */
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| 35 |
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| 36 | #define _IO(x,y) ((x << 8) | y)
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| 37 | #define _IOR(x,y,t) _IO(x,y)
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| 38 | #define _IOW(x,y,t) _IO(x,y)
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| 39 | #define _IORW(x,y,t) _IO(x,y)
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| 40 | #endif
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| 41 |
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| 42 | int ioctl(int _fd, int _request, void *_data);
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| 43 |
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| 44 | #endif /* _M_IOCTL_H */
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