Struct TruncateFile 

pub struct TruncateFile<S: AsFd> { /* private fields */ }

Available on Unix only.

Truncates or extends the underlying file, updating the size of this file to become size.

Implementations

impl<S: AsFd> TruncateFile<S>

pub fn new(fd: S, size: u64) -> Self

Create TruncateFile.

Trait Implementations

impl<S: Debug + AsFd> Debug for TruncateFile<S>

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

Formats the value using the given formatter.

impl<S: AsFd> OpCode for TruncateFile<S>

fn pre_submit(self: Pin<&mut Self>) -> Result<Decision>

Perform the operation before submit, and return Decision to indicate whether submitting the operation to polling is required.

fn operate(self: Pin<&mut Self>) -> Poll<Result<usize>>

Perform the operation after received corresponding event. If this operation is blocking, the return value should be Poll::Ready.

fn op_type(self: Pin<&mut Self>) -> Option<OpType>

Get the operation type when an event is occurred.

impl<S: AsFd> OpCode for TruncateFile<S>

fn create_entry(self: Pin<&mut Self>) -> OpEntry

Create submission entry.

fn call_blocking(self: Pin<&mut Self>) -> Result<usize>

Call the operation in a blocking way. This method will only be called if create_entry returns OpEntry::Blocking.

unsafe fn set_result(self: Pin<&mut Self>, _: usize)

Set the result when it successfully completes. The operation stores the result and is responsible to release it if the operation is cancelled.