69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* minix/ioctl.h - Ioctl helper definitions. Author: Kees J. Bot
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* 23 Nov 2002
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*
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* This file is included by every header file that defines ioctl codes.
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*/
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#ifndef _M_IOCTL_H
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#define _M_IOCTL_H
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#ifndef _TYPES_H
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#include <minix/types.h>
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#endif
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#if _EM_WSIZE >= 4
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/* Ioctls have the command encoded in the low-order word, and the size
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* of the parameter in the high-order word. The 3 high bits of the high-
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* order word are used to encode the in/out/void status of the parameter.
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*/
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#define _IOCPARM_MASK 0x0FFF
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#define _IOCPARM_MASK_BIG 0x0FFFFF
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#define _IOC_VOID 0x20000000
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#define _IOCTYPE_MASK 0xFFFF
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#define _IOC_IN 0x40000000
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#define _IOC_OUT 0x80000000
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#define _IOC_INOUT (_IOC_IN | _IOC_OUT)
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/* Flag indicating ioctl format with only one type field, and more bits
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* for the size field (using mask _IOCPARM_MASK_BIG).
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*/
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#define _IOC_BIG 0x10000000
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#define _IO(x,y) ((x << 8) | y | _IOC_VOID)
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#define _IOR(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_OUT)
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#define _IOW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_IN)
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#define _IORW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_INOUT)
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#define _IOW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_IN | _IOC_BIG)
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#define _IOR_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_OUT | _IOC_BIG)
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#define _IORW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_INOUT | _IOC_BIG)
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/* Decode an ioctl call. */
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#define _MINIX_IOCTL_SIZE(i) (((i) >> 16) & _IOCPARM_MASK)
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#define _MINIX_IOCTL_IOR(i) ((i) & _IOC_OUT)
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#define _MINIX_IOCTL_IORW(i) ((i) & _IOC_INOUT)
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#define _MINIX_IOCTL_IOW(i) ((i) & _IOC_IN)
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/* Recognize and decode size of a 'big' ioctl call. */
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#define _MINIX_IOCTL_BIG(i) ((i) & _IOC_BIG)
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#define _MINIX_IOCTL_SIZE_BIG(i) (((i) >> 8) & _IOCPARM_MASK_BIG)
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#else
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/* No fancy encoding on a 16-bit machine. */
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#define _IO(x,y) ((x << 8) | y)
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#define _IOR(x,y,t) _IO(x,y)
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#define _IOW(x,y,t) _IO(x,y)
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#define _IORW(x,y,t) _IO(x,y)
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#endif
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int ioctl(int _fd, int _request, void *_data);
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#endif /* _M_IOCTL_H */
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