Trait AsOpenFile 

pub trait AsOpenFile {
    // Required method
    fn as_fd(&self) -> BorrowedFd<'_>;
}

A trait to borrow the file descriptor from an underlying object.

This is only available on unix platforms and must be imported in order to call the method. Windows platforms have a corresponding AsHandle and AsSocket set of traits.

Required Methods

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

Borrows the file descriptor.

Example

use std::fs::File;

let mut f = File::open("foo.txt")?;
let borrowed_fd: BorrowedFd<'_> = f.as_fd();

Implementors

impl AsFd for File

Available on non-target_os=trusty only.

impl AsFd for PipeReader

Available on non-target_os=trusty only.

impl AsFd for PipeWriter

Available on non-target_os=trusty only.

impl AsFd for Stderr

impl AsFd for Stdin

impl AsFd for Stdout

impl AsFd for TcpListener

Available on non-target_os=trusty only.

impl AsFd for TcpStream

Available on non-target_os=trusty only.

impl AsFd for UdpSocket

Available on non-target_os=trusty only.

impl AsFd for BorrowedFd<'_>

impl AsFd for OwnedFd

impl AsFd for UnixDatagram

impl AsFd for UnixListener

impl AsFd for UnixStream

impl AsFd for ChildStderr

impl AsFd for ChildStdin

impl AsFd for ChildStdout

impl<'a> AsFd for StderrLock<'a>

impl<'a> AsFd for StdinLock<'a>

impl<'a> AsFd for StdoutLock<'a>

impl<T> AsFd for &T

where T: AsFd + ?Sized,

impl<T> AsFd for &mut T

where T: AsFd + ?Sized,

impl<T> AsFd for Box<T>

where T: AsFd + ?Sized,

impl<T> AsFd for Rc<T>

where T: AsFd + ?Sized,

impl<T> AsFd for UniqueRc<T>

where T: AsFd + ?Sized,

impl<T> AsFd for Arc<T>

where T: AsFd + ?Sized,

This impl allows implementing traits that require AsFd on Arc.

use std::net::UdpSocket;
use std::sync::Arc;

trait MyTrait: AsFd {}
impl MyTrait for Arc<UdpSocket> {}
impl MyTrait for Box<UdpSocket> {}