Trait AsRawFd

pub trait AsRawFd {
    // Required method
    fn as_raw_fd(&self) -> i32;
}

Available on Unix only.

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

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

impl AsRawFd for i32

impl AsRawFd for mio::net::tcp::listener::TcpListener

impl AsRawFd for mio::net::tcp::stream::TcpStream

impl AsRawFd for mio::net::udp::UdpSocket

impl AsRawFd for mio::net::uds::datagram::UnixDatagram

impl AsRawFd for mio::net::uds::listener::UnixListener

impl AsRawFd for mio::net::uds::stream::UnixStream

impl AsRawFd for Poll

impl AsRawFd for Registry

impl AsRawFd for mio::sys::unix::pipe::Receiver

impl AsRawFd for mio::sys::unix::pipe::Sender

impl AsRawFd for PtyMaster

impl AsRawFd for SignalFd

impl AsRawFd for Handle

impl AsRawFd for Socket

impl AsRawFd for rustmax::tokio::fs::File

impl AsRawFd for rustmax::tokio::io::Stderr

impl AsRawFd for rustmax::tokio::io::Stdin

impl AsRawFd for rustmax::tokio::io::Stdout

impl AsRawFd for rustmax::tokio::net::TcpListener

impl AsRawFd for TcpSocket

impl AsRawFd for rustmax::tokio::net::TcpStream

impl AsRawFd for rustmax::tokio::net::UdpSocket

impl AsRawFd for rustmax::tokio::net::UnixDatagram

impl AsRawFd for rustmax::tokio::net::UnixListener

impl AsRawFd for UnixSocket

impl AsRawFd for rustmax::tokio::net::UnixStream

impl AsRawFd for rustmax::tokio::net::unix::pipe::Receiver

impl AsRawFd for rustmax::tokio::net::unix::pipe::Sender

impl AsRawFd for rustmax::tokio::process::ChildStderr

impl AsRawFd for rustmax::tokio::process::ChildStdin

impl AsRawFd for rustmax::tokio::process::ChildStdout

impl AsRawFd for rustmax::std::fs::File

impl AsRawFd for rustmax::std::io::Stderr

impl AsRawFd for rustmax::std::io::Stdin

impl AsRawFd for rustmax::std::io::Stdout

impl AsRawFd for rustmax::std::net::TcpListener

impl AsRawFd for rustmax::std::net::TcpStream

impl AsRawFd for rustmax::std::net::UdpSocket

impl AsRawFd for PipeReader

impl AsRawFd for PipeWriter

impl AsRawFd for rustmax::std::process::ChildStderr

impl AsRawFd for rustmax::std::process::ChildStdin

impl AsRawFd for rustmax::std::process::ChildStdout

impl AsRawFd for BorrowedFd<'_>

impl AsRawFd for OwnedFd

impl AsRawFd for PidFd

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

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

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

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

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

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

impl<F> AsRawFd for NamedTempFile<F>

where F: AsRawFd,

impl<S> AsRawFd for TlsStream<S>

where S: AsRawFd,

impl<T> AsRawFd for AsyncFd<T>

where T: AsRawFd,

impl<T> AsRawFd for Box<T>

where T: AsRawFd,

impl<T> AsRawFd for Rc<T>

where T: AsRawFd,

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> {}