Struct Updater

pub struct Updater<'a, const OPCODE: Opcode, Value> { /* private fields */ }

Implements an “updater” pattern for ioctls.

The ioctl takes a reference to a struct that it reads its input from, then writes output to the same struct.

To compute a value for the OPCODE argument, see the functions in the opcode module.

Implementations

impl<'a, const OPCODE: Opcode, Value> Updater<'a, OPCODE, Value>

pub unsafe fn new(value: &'a mut Value) -> Self

Create a new pointer updater-style ioctl object.

Safety

• OPCODE must provide a valid opcode.
• For this opcode, Value must be the type that the kernel expects to get.

Trait Implementations

impl<'a, const OPCODE: Opcode, T> Ioctl for Updater<'a, OPCODE, T>

const IS_MUTATING: bool = true

Does the ioctl mutate any data in the userspace?

type Output = ()

The type of the output data.

fn opcode(&self) -> Opcode

Get the opcode used by this ioctl command.

fn as_ptr(&mut self) -> *mut c_void

Get a pointer to the data to be passed to the ioctl command.

unsafe fn output_from_ptr(_output: IoctlOutput, _ptr: *mut c_void) -> Result<()>

Cast the output data to the correct type.