Module opcode

Const functions for computing opcode values.

Linux’s headers define macros such as _IO, _IOR, _IOW, and _IOWR for defining ioctl values in a structured way that encode whether they are reading and/or writing, and other information about the ioctl. The functions in this module correspond to those macros.

If you’re writing a driver and defining your own ioctl numbers, it’s recommended to use these functions to compute them.

Functions

from_components

Create a new opcode from a direction, group, number, and size.

none

Create a new opcode from a group, a number, that uses no data.

read

Create a new reading opcode from a group, a number and the type of data.

read_write

Create a new reading and writing opcode from a group, a number and the type of data.

write

Create a new writing opcode from a group, a number and the type of data.