IOCTL

DIRBITS = 2

DIRMASK = ((1 << DIRBITS) - 1)

DIRSHIFT = (SIZESHIFT + SIZEBITS)

NRBITS = 8

NRMASK = ((1 << NRBITS) - 1)

NRSHIFT = 0

SIZEBITS = 14

SIZEMASK = ((1 << SIZEBITS) - 1)

SIZESHIFT = (TYPESHIFT + TYPEBITS)

TYPEBITS = 8

TYPEMASK = ((1 << TYPEBITS) - 1)

TYPESHIFT = (NRSHIFT + NRBITS)

_DIR(nr)

_IO(*args)

_IOC(dir : Dir, type : Int | Char, nr : Int, size : Int) : UInt32

_IOR(*args)

_IOW(*args)

_IOWR(*args)

_NR(nr)

_SIZE(nr)

_TYPE(nr)

ioctl(fd, request, *args)