Struct DeviceIoControlIo 

pub struct DeviceIoControlIo<I, O> { /* private fields */ }

A pending device-control operation submitted through AssociatedEndpoint::ioctl.

The token carries the operation’s identity and remembers both buffer types it was submitted with, so DeviceIoControlIo::claim hands back the caller’s own output buffer – the same value, not a copy – once the matching completion is dequeued. The input type is carried too, because it is part of the payload type the claim must name.

Implementations

impl<I: IoBuf, O: IoBufMut> DeviceIoControlIo<I, O>

pub fn id(&self) -> OperationId

The identity of the in-flight operation, for cancellation or matching.

pub fn claim(self, completion: &Completion) -> Result<(O, Result<usize>), Self>

Claim this operation’s result from completion.

On a match returns Ok((output, result)): output is the buffer the caller handed over (valid up to the byte count) and result is the byte count or the operation’s error. Returns Err(self) when completion belongs to a different operation.

The input buffer is dropped here: the driver is done reading it, and returning both would make the common case pay for the rare one.

Trait Implementations

impl<I: Debug, O: Debug> Debug for DeviceIoControlIo<I, O>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.