module IOCTL

Included Modules

• IOCTLS

Extended Modules

• IOCTL

Defined in:

asm-generic/ioctl.cr
ioctl.cr

Constant Summary

DIRBITS = 2

IOC_DIRMASK = (1 << IOC_DIRBITS) - 1

IOC_DIRSHIFT = IOC_SIZESHIFT + IOC_SIZEBITS

IOC_IN = IOC_WRITE << IOC_DIRSHIF

for the drivers/sound files...

IOC_INOUT = (IOC_WRITE | IOC_READ) << IOC_DIRSHIFT

IOC_NRBITS = 8

The following is for compatibility across the various Linux platforms. The generic ioctl numbering scheme doesn't really enforce a type field. De facto, however, the top 8 bits of the lower 16 bits are indeed used as a type field, so we might just as well make this explicit here. Please be sure to use the decoding macros below from now on.

IOC_NRMASK = (1 << IOC_NRBITS) - 1

IOC_NRSHIFT = 0

IOC_OUT = IOC_READ << IOC_DIRSHIFT

IOC_SIZEBITS = 14

Let any architecture override either of the following before including this file.

IOC_SIZEMASK = (1 << IOC_SIZEBITS) - 1

IOC_SIZESHIFT = IOC_TYPESHIFT + IOC_TYPEBITS

IOC_TYPEBITS = 8

IOC_TYPEMASK = (1 << IOC_TYPEBITS) - 1

IOC_TYPESHIFT = IOC_NRSHIFT + IOC_NRBITS

IOCSIZE_MASK = IOC_SIZEMASK << IOC_SIZESHIFT

IOCSIZE_SHIFT = IOC_SIZESHIFT

VERSION = "0.1.0"

Instance Method Summary

• #_IO(type : Char | Int, nr : Int) : UInt32
• #_IOC(dir : IOC, type : Int | Char, nr : Int, size : Int) : UInt32

  Used to create numbers.

• #_IOC_DIR(dir : IOC)

  Decodes ioctl dir number.

• #_IOC_NR(nr : Int)

  Decodes ioctl nr number.

• #_IOC_SIZE(size : Int)

  Decodes ioctl size number.

• #_IOC_TYPE(type : Char | Int)

  Decodes ioctl type number.

• #_IOR(type : Char | Int, nr : Int, size : T.class) : UInt32 forall T

  _IOR means userland is reading and kernel is writing.

• #_IOW(type : Char | Int, nr : Int, size : T.class) : UInt32 forall T

  _IOW means userland is writing and kernel is reading.

• #_IOWR(type : Char | Int, nr : Int, size : T.class) : UInt32 forall T
• #ioctl(fd : LibC::Int, request : UInt32, *arguments) : Nil

  Executes an #ioctl call, and raises in case of an error

• #ioctl?(fd : LibC::Int, request : UInt32, *arguments) : Errno | Nil

  Executes an #ioctl call, and returns an Errno in case of an error.

Instance Method Detail