Trait async_std::os::unix::io::AsRawFd

1.0.0 · source ·
pub trait AsRawFd {
    // Required method
    fn as_raw_fd(&self) -> i32;
}
Expand description

A trait to extract the raw file descriptor from an underlying object.

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

Required Methods§

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fn as_raw_fd(&self) -> i32

Extracts the raw file descriptor.

This function is typically used to borrow an owned file descriptor. When used in this way, this method does not pass ownership of the raw file descriptor to the caller, and the file descriptor is only guaranteed to be valid while the original object has not yet been destroyed.

However, borrowing is not strictly required. See [AsFd::as_fd] for an API which strictly borrows a file descriptor.

Example
use std::fs::File;
#[cfg(any(unix, target_os = "wasi"))]
use std::os::fd::{AsRawFd, RawFd};

let mut f = File::open("foo.txt")?;
// Note that `raw_fd` is only valid as long as `f` exists.
#[cfg(any(unix, target_os = "wasi"))]
let raw_fd: RawFd = f.as_raw_fd();

Implementors§

1.48.0 · source§

impl AsRawFd for i32

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impl AsRawFd for Poller

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impl AsRawFd for Socket

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impl AsRawFd for async_std::fs::File

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impl AsRawFd for async_std::io::Stderr

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impl AsRawFd for async_std::io::Stdin

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impl AsRawFd for async_std::io::Stdout

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impl AsRawFd for async_std::net::TcpListener

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impl AsRawFd for async_std::net::TcpStream

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impl AsRawFd for async_std::net::UdpSocket

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impl AsRawFd for async_std::process::ChildStderr

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impl AsRawFd for async_std::process::ChildStdin

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impl AsRawFd for async_std::process::ChildStdout

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impl AsRawFd for async_std::os::unix::net::UnixDatagram

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impl AsRawFd for async_std::os::unix::net::UnixListener

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impl AsRawFd for async_std::os::unix::net::UnixStream

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impl AsRawFd for std::fs::File

1.21.0 · source§

impl AsRawFd for std::io::stdio::Stderr

1.21.0 · source§

impl AsRawFd for std::io::stdio::Stdin

1.21.0 · source§

impl AsRawFd for std::io::stdio::Stdout

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impl AsRawFd for std::net::tcp::TcpListener

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impl AsRawFd for std::net::tcp::TcpStream

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impl AsRawFd for std::net::udp::UdpSocket

1.63.0 · source§

impl AsRawFd for BorrowedFd<'_>

1.63.0 · source§

impl AsRawFd for OwnedFd

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impl AsRawFd for PidFd

1.10.0 · source§

impl AsRawFd for std::os::unix::net::datagram::UnixDatagram

1.10.0 · source§

impl AsRawFd for std::os::unix::net::listener::UnixListener

1.10.0 · source§

impl AsRawFd for std::os::unix::net::stream::UnixStream

1.2.0 · source§

impl AsRawFd for std::process::ChildStderr

1.2.0 · source§

impl AsRawFd for std::process::ChildStdin

1.2.0 · source§

impl AsRawFd for std::process::ChildStdout

1.35.0 · source§

impl<'a> AsRawFd for StderrLock<'a>

1.35.0 · source§

impl<'a> AsRawFd for StdinLock<'a>

1.35.0 · source§

impl<'a> AsRawFd for StdoutLock<'a>

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impl<T> AsRawFd for Async<T>
where T: AsRawFd,

1.63.0 · source§

impl<T> AsRawFd for Arc<T>
where T: AsRawFd,

This impl allows implementing traits that require AsRawFd on Arc.

use std::net::UdpSocket;
use std::sync::Arc;
trait MyTrait: AsRawFd {
}
impl MyTrait for Arc<UdpSocket> {}
impl MyTrait for Box<UdpSocket> {}
1.63.0 · source§

impl<T> AsRawFd for Box<T>
where T: AsRawFd,

1.69.0 · source§

impl<T> AsRawFd for Rc<T>
where T: AsRawFd,