Trait AsRawFd

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

Available on crate feature dep_rustix 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 File

impl AsRawFd for devela::all::ProcessStderr

impl AsRawFd for devela::all::ProcessStdin

impl AsRawFd for devela::all::ProcessStdout

impl AsRawFd for devela::all::Stderr

impl AsRawFd for devela::all::Stdin

impl AsRawFd for devela::all::Stdout

impl AsRawFd for devela::all::TcpListener

impl AsRawFd for devela::all::TcpStream

impl AsRawFd for devela::all::UdpSocket

impl AsRawFd for PipeReader

impl AsRawFd for PipeWriter

impl AsRawFd for PidFd

impl AsRawFd for devela::_dep::_std::os::unix::net::UnixDatagram

impl AsRawFd for devela::_dep::_std::os::unix::net::UnixListener

impl AsRawFd for devela::_dep::_std::os::unix::net::UnixStream

impl AsRawFd for devela::_dep::tokio::io::Stderr

impl AsRawFd for devela::_dep::tokio::io::Stdin

impl AsRawFd for devela::_dep::tokio::io::Stdout

impl AsRawFd for devela::_dep::tokio::process::ChildStderr

impl AsRawFd for devela::_dep::tokio::process::ChildStdin

impl AsRawFd for devela::_dep::tokio::process::ChildStdout

impl AsRawFd for BorrowedFd<'_>

impl AsRawFd for OwnedFd

impl AsRawFd for EventFd

impl AsRawFd for Inotify

impl AsRawFd for Poll

impl AsRawFd for Receiver

impl AsRawFd for Registry

impl AsRawFd for Sender

impl AsRawFd for TcpListener

impl AsRawFd for TcpStream

impl AsRawFd for UdpSocket

impl AsRawFd for UnixDatagram

impl AsRawFd for UnixListener

impl AsRawFd for UnixStream

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

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

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

impl<T> AsRawFd for devela::all::Arc<T>

where T: AsRawFd,

This impl allows implementing traits that require AsRawFd on Arc.

use portable_atomic_util::Arc;
use std::net::UdpSocket;

trait MyTrait: AsRawFd {}
impl MyTrait for Arc<UdpSocket> {}

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,

impl<T> AsRawFd for devela::_dep::_alloc::sync::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> {}