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 CFFileDescriptor

impl AsRawFd for std::process::ChildStderr

impl AsRawFd for compio::process::ChildStderr

impl AsRawFd for std::process::ChildStdin

impl AsRawFd for compio::process::ChildStdin

impl AsRawFd for std::process::ChildStdout

impl AsRawFd for compio::process::ChildStdout

impl AsRawFd for CurrentDir

impl AsRawFd for std::fs::Dir

impl AsRawFd for compio::fs::Dir

impl AsRawFd for std::fs::File

Available on non-Trusty only.

impl AsRawFd for compio::fs::File

impl AsRawFd for Handle

impl AsRawFd for OwnedFd

impl AsRawFd for PipeReader

Available on non-Trusty only.

impl AsRawFd for PipeWriter

Available on non-Trusty only.

impl AsRawFd for Poll

Available on Unix and neither AIX nor Cygwin nor ESP-IDF nor Fuchsia nor GNU/Hurd nor Haiku nor Hermit nor Horizon nor NuttX nor Play Station Vita nor QNX SDP 7.x and non-mio_unsupported_force_poll_poll only.

impl AsRawFd for Poller

impl AsRawFd for Proactor

impl AsRawFd for Receiver

impl AsRawFd for Receiver

Available on crate feature os-ext only.

impl AsRawFd for compio::fs::pipe::Receiver

impl AsRawFd for Registry

Available on Unix and neither AIX nor Cygwin nor ESP-IDF nor Fuchsia nor GNU/Hurd nor Haiku nor Hermit nor Horizon nor NuttX nor Play Station Vita nor QNX SDP 7.x and non-mio_unsupported_force_poll_poll only.

impl AsRawFd for Runtime

impl AsRawFd for Sender

impl AsRawFd for Sender

Available on crate feature os-ext only.

impl AsRawFd for compio::fs::pipe::Sender

impl AsRawFd for Socket

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

impl AsRawFd for compio::fs::Stderr

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

Available on non-Trusty only.

impl AsRawFd for compio::fs::Stdin

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

impl AsRawFd for compio::fs::Stdout

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

impl AsRawFd for TcpListener

impl AsRawFd for TcpListener

Available on Hermit or Unix or WASI only.

impl AsRawFd for compio::net::TcpListener

impl AsRawFd for TcpSocket

Available on Unix, or WASI, or docsrs only.

impl AsRawFd for compio::net::TcpSocket

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

impl AsRawFd for TcpStream

impl AsRawFd for TcpStream

Available on Hermit or Unix or WASI only.

impl AsRawFd for compio::net::TcpStream

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

impl AsRawFd for UdpSocket

impl AsRawFd for UdpSocket

Available on Hermit or Unix or WASI only.

impl AsRawFd for compio::net::UdpSocket

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

impl AsRawFd for UnixDatagram

impl AsRawFd for UnixDatagram

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

impl AsRawFd for UnixListener

impl AsRawFd for UnixListener

impl AsRawFd for compio::net::UnixListener

impl AsRawFd for UnixSocket

impl AsRawFd for compio::net::UnixSocket

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

impl AsRawFd for UnixStream

impl AsRawFd for UnixStream

impl AsRawFd for compio::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<F> AsRawFd for NamedTempFile<F>

where F: AsRawFd,

Available on Unix or WASI only.

impl<IO> AsRawFd for TlsStream<IO>

where IO: AsRawFd,

Available on Unix only.

impl<S> AsRawFd for TlsStream<S>

where S: AsRawFd,

Available on Unix only.

impl<S> AsRawFd for TlsStream<S>

where S: AsRawFd,

Available on Unix only.

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 compio::runtime::fd::AsyncFd<T>

where T: AsFd,

impl<T> AsRawFd for AsyncFd<T>

where T: AsRawFd,

impl<T> AsRawFd for Box<T>

where T: AsRawFd,

impl<T> AsRawFd for Filter<T>

where T: AsRawFd,

impl<T> AsRawFd for PollFd<T>

where T: AsFd,

impl<T> AsRawFd for Rc<T>

where T: AsRawFd,

impl<T> AsRawFd for SharedFd<T>

where T: AsFd,

impl<T> AsRawFd for UniqueRc<T>

where T: AsRawFd + ?Sized,