2013-04-18 12:13:57 -04:00
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# See linux/include/uapi/asm-generic/ioctl.h
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import struct
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_IOC_NRBITS = 8
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_IOC_TYPEBITS = 8
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# According to linux these *may* be architecture specific
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_IOC_SIZEBITS = 14
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_IOC_DIRBITS = 2
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_IOC_NRMASK = (1 << _IOC_NRBITS) - 1
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_IOC_TYPEMASK = (1 << _IOC_TYPEBITS) - 1
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_IOC_SIZEMASK = (1 << _IOC_SIZEBITS) - 1
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_IOC_DIRMASK = (1 << _IOC_DIRBITS) - 1
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_IOC_NRSHIFT = 0
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_IOC_TYPESHIFT = _IOC_NRSHIFT + _IOC_NRBITS
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_IOC_SIZESHIFT = _IOC_TYPESHIFT + _IOC_TYPEBITS
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_IOC_DIRSHIFT = _IOC_SIZESHIFT + _IOC_SIZEBITS
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_IOC_NONE = 0
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_IOC_WRITE = 1
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_IOC_READ = 2
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def IOC(_dir, _type, nr, size):
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if type(size) in (str, unicode):
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size = struct.calcsize(size)
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2013-04-18 19:11:56 -04:00
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return _dir << _IOC_DIRSHIFT | _type << _IOC_TYPESHIFT | \
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nr << _IOC_NRSHIFT | size << _IOC_SIZESHIFT
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2013-04-18 12:13:57 -04:00
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IO = lambda _type, nr: IOC(_IOC_NONE, _type, nr, 0)
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IOR = lambda _type, nr, size: IOC(_IOC_READ, _type, nr, size)
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IOW = lambda _type, nr, size: IOC(_IOC_WRITE, _type, nr, size)
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IORW = lambda _type, nr, size: IOC(_IOC_READ | _IOC_WRITE, _type, nr, size)
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