Simple copy stdin to stdout example using Rust tokio

tokiostdin.rs

extern crate futures;
extern crate tokio_core;
extern crate tokio_io;
extern crate tokio_file_unix;

use futures::{Future};
use tokio_io::io::copy;
use tokio_core::reactor::Core;
use std::io::{Result};

use std::os::unix::io::FromRawFd;
use tokio_file_unix::File as TokioFile;

fn run() -> Result<()> {
    let mut core = Core::new()?;
    let handle = core.handle();
    
    let fd0_f : std::fs::File = unsafe{FromRawFd::from_raw_fd(0)};
    let fd1_f : std::fs::File = unsafe{FromRawFd::from_raw_fd(1)};
    
    let fd0 = TokioFile::new_nb(fd0_f)?.into_io(&handle)?;
    let fd1 = TokioFile::new_nb(fd1_f)?.into_io(&handle)?;
    
    core.run(copy(fd0, fd1).map(|_|{}))
}

fn main() {
    run().unwrap()
}