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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes