Trait sparse_mmap::AsMappableRef

pub trait AsMappableRef {
    // Required method
    fn as_fd(&self) -> BorrowedFd<'_>;
}

An object that can be mapped into a SparseMapping.

On Windows, this is a section handle. On Linux, it is a file descriptor. A trait to borrow the file descriptor from an underlying object.

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

Required Methods

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

Example

use std::fs::File;

let mut f = File::open("foo.txt")?;
let borrowed_fd: BorrowedFd<'_> = f.as_fd();

Implementors

impl AsFd for Child

impl AsFd for File

impl AsFd for Stderr

impl AsFd for Stdin

impl AsFd for Stdout

impl AsFd for TcpListener

impl AsFd for TcpStream

impl AsFd for UdpSocket

impl AsFd for BorrowedFd<'_>

impl AsFd for OwnedFd

impl AsFd for PidFd

impl AsFd for UnixDatagram

impl AsFd for UnixListener

impl AsFd for UnixStream

impl AsFd for PipeReader

impl AsFd for PipeWriter

impl AsFd for ChildStderr

impl AsFd for ChildStdin

impl AsFd for ChildStdout

impl AsFd for PathFd

impl<'a> AsFd for StderrLock<'a>

impl<'a> AsFd for StdinLock<'a>

impl<'a> AsFd for StdoutLock<'a>

impl<T> AsFd for &T

where T: AsFd + ?Sized,

impl<T> AsFd for &mut T

where T: AsFd + ?Sized,

impl<T> AsFd for Box<T>

where T: AsFd + ?Sized,

impl<T> AsFd for Rc<T>

where T: AsFd + ?Sized,

impl<T> AsFd for Arc<T>

where T: AsFd + ?Sized,

This impl allows implementing traits that require AsFd on Arc.

use std::net::UdpSocket;
use std::sync::Arc;

trait MyTrait: AsFd {}
impl MyTrait for Arc<UdpSocket> {}
impl MyTrait for Box<UdpSocket> {}