Trait std::os::unix::io::AsFd[][src]

pub trait AsFd {
    fn as_fd(&self) -> BorrowedFd<'_>;
🔬 This is a nightly-only experimental API. (io_safety #87074)
This is supported on Unix only.
Expand description

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

🔬 This is a nightly-only experimental API. (io_safety #87074)

Borrows the file descriptor.

use std::fs::File;

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