Struct Sender

pub struct Sender { /* private fields */ }

Available on Unix and crate feature os-ext and crate feature os-poll only.

Sending end of an Unix pipe.

See new for documentation, including examples.

Implementations

impl Sender

pub fn set_nonblocking(&self, nonblocking: bool) -> Result<()>

Set the Sender into or out of non-blocking mode.

pub fn try_io<F, T>(&self, f: F) -> Result<T>

where F: FnOnce() -> Result<T>,

Execute an I/O operation ensuring that the socket receives more events if it hits a WouldBlock error.

Notes

This method is required to be called for all I/O operations to ensure the user will receive events once the socket is ready again after returning a WouldBlock error.

Examples

use std::io;
use std::os::fd::AsRawFd;
use mio::unix::pipe;

let (sender, receiver) = pipe::new()?;

// Wait until the sender is writable...

// Write to the sender using a direct libc call, of course the
// `io::Write` implementation would be easier to use.
let buf = b"hello";
let n = sender.try_io(|| {
    let buf_ptr = &buf as *const _ as *const _;
    let res = unsafe { libc::write(sender.as_raw_fd(), buf_ptr, buf.len()) };
    if res != -1 {
        Ok(res as usize)
    } else {
        // If EAGAIN or EWOULDBLOCK is set by libc::write, the closure
        // should return `WouldBlock` error.
        Err(io::Error::last_os_error())
    }
})?;
eprintln!("write {} bytes", n);

// Wait until the receiver is readable...

// Read from the receiver using a direct libc call, of course the
// `io::Read` implementation would be easier to use.
let mut buf = [0; 512];
let n = receiver.try_io(|| {
    let buf_ptr = &mut buf as *mut _ as *mut _;
    let res = unsafe { libc::read(receiver.as_raw_fd(), buf_ptr, buf.len()) };
    if res != -1 {
        Ok(res as usize)
    } else {
        // If EAGAIN or EWOULDBLOCK is set by libc::read, the closure
        // should return `WouldBlock` error.
        Err(io::Error::last_os_error())
    }
})?;
eprintln!("read {} bytes", n);

Trait Implementations

impl AsFd for Sender

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl AsRawFd for Sender

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl Debug for Sender

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

Formats the value using the given formatter.

impl From<ChildStdin> for Sender

Notes

The underlying pipe is not set to non-blocking.

fn from(stdin: ChildStdin) -> Sender

Converts to this type from the input type.

impl FromRawFd for Sender

unsafe fn from_raw_fd(fd: RawFd) -> Sender

Constructs a new instance of Self from the given raw file descriptor.

impl IntoRawFd for Sender

fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor.

impl Source for Sender

fn register( &mut self, registry: &Registry, token: Token, interests: Interest, ) -> Result<()>

Register self with the given Registry instance.

fn reregister( &mut self, registry: &Registry, token: Token, interests: Interest, ) -> Result<()>

Re-register self with the given Registry instance.

fn deregister(&mut self, registry: &Registry) -> Result<()>

Deregister self from the given Registry instance.

impl Write for &Sender

fn write(&mut self, buf: &[u8]) -> Result<usize>

Writes a buffer into this writer, returning how many bytes were written.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize>

Like write, except that it writes from a slice of buffers.

fn flush(&mut self) -> Result<()>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.

impl Write for Sender

fn write(&mut self, buf: &[u8]) -> Result<usize>

Writes a buffer into this writer, returning how many bytes were written.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize>

Like write, except that it writes from a slice of buffers.

fn flush(&mut self) -> Result<()>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.

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: 16 bytes