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Showing content from https://doc.rust-lang.org/stable/std/os/fd/trait.IntoRawFd.html below:

IntoRawFd in std::os::fd - Rust

pub trait IntoRawFd {
    // Required method
    fn into_raw_fd(self) -> RawFd;
}

A trait to express the ability to consume an object and acquire ownership of its raw file descriptor.

Consumes this object, returning the raw underlying file descriptor.

This function is typically used to transfer ownership of the underlying file descriptor to the caller. When used in this way, callers are then the unique owners of the file descriptor and must close it once it’s no longer needed.

However, transferring ownership is not strictly required. Use a Into<OwnedFd>::into implementation for an API which strictly transfers ownership.

use std::fs::File;
#[cfg(any(unix, target_os = "wasi"))]
use std::os::fd::{IntoRawFd, RawFd};

let f = File::open("foo.txt")?;
#[cfg(any(unix, target_os = "wasi"))]
let raw_fd: RawFd = f.into_raw_fd();

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