Trait AsRawFd 

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

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();

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl AsRawFd for BorrowedFd<'_>

impl AsRawFd for std::process::ChildStderr

impl AsRawFd for async_std::process::ChildStderr

Available on Unix only.

impl AsRawFd for std::process::ChildStdin

impl AsRawFd for async_std::process::ChildStdin

Available on Unix only.

impl AsRawFd for std::process::ChildStdout

impl AsRawFd for async_std::process::ChildStdout

Available on Unix only.

impl AsRawFd for Dir

impl AsRawFd for std::fs::File

Available on non-Trusty only.

impl AsRawFd for async_std::fs::File

Available on Unix or crate feature docs only.

impl AsRawFd for OwnedFd

impl AsRawFd for PidFd

impl AsRawFd for PipeReader

Available on non-Trusty only.

impl AsRawFd for PipeWriter

Available on non-Trusty only.

impl AsRawFd for Poller

impl AsRawFd for Signals

Available on Unix only.

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

impl AsRawFd for async_std::io::Stderr

Available on Unix or crate feature docs only.

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

Available on non-Trusty only.

impl AsRawFd for async_std::io::Stdin

Available on Unix or crate feature docs only.

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

impl AsRawFd for async_std::io::Stdout

Available on Unix or crate feature docs only.

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

impl AsRawFd for async_std::net::TcpListener

Available on Unix or crate feature docs only.

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

impl AsRawFd for async_std::net::TcpStream

Available on Unix or crate feature docs only.

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

impl AsRawFd for async_std::net::UdpSocket

Available on Unix or crate feature docs only.

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

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

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

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

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

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

impl AsRawFd for i32

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

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

Available on non-Trusty only.

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

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> {}

impl<T> AsRawFd for Async<T>

where T: AsRawFd,

Available on Unix only.

impl<T> AsRawFd for Box<T>

where T: AsRawFd,

impl<T> AsRawFd for Rc<T>

where T: AsRawFd,

impl<T> AsRawFd for UniqueRc<T>

where T: AsRawFd + ?Sized,