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Trait std::os::fd::AsFd

pub trait AsFd {
    // 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

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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

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impl AsFd for File
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impl AsFd for Stderr
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impl AsFd for Stdin
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impl AsFd for Stdout
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impl AsFd for TcpListener
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impl AsFd for TcpStream
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impl AsFd for UdpSocket
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impl AsFd for ChildStderrAvailable on Unix only.
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impl AsFd for ChildStdinAvailable on Unix only.
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impl AsFd for ChildStdoutAvailable on Unix only.
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impl AsFd for PidFdAvailable on Linux only.
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impl AsFd for UnixDatagramAvailable on Unix only.
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impl AsFd for UnixListenerAvailable on Unix only.
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impl AsFd for UnixStreamAvailable on Unix only.
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impl AsFd for BorrowedFd<'_>
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impl AsFd for OwnedFd
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impl<'a> AsFd for StderrLock<'a>
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impl<'a> AsFd for StdinLock<'a>
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impl<'a> AsFd for StdoutLock<'a>
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impl<T: AsFd> AsFd for &T
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impl<T: AsFd> AsFd for &mut T
1.64.0source 
impl<T: AsFd> AsFd for Box<T>
1.69.0source 
impl<T: AsFd> AsFd for Rc<T>
1.64.0source 
impl<T: AsFd> AsFd for Arc<T>

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> {}

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/os/fd/trait.AsFd.html