You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: unix-signal.rs
    path of file: ./repos/smol/examples
    
    the code of the file until where you have to start completion: //! Uses the `signal-hook` crate to catch the Ctrl-C signal.
//!
//! Run with:
//!
//! ```

    
fn main() -> std::io::Result<()> {
    use std::os::unix::{io::AsRawFd, net::UnixStream};

    use smol::{prelude::*, Async};

    smol::block_on(async {
        // Create a Unix stream that receives a byte on each signal occurrence.
        let (a, mut b) = Async::<UnixStream>::pair()?;
        // Async isn't IntoRawFd, but it is AsRawFd, so let's pass the raw fd directly.
        signal_hook::low_level::pipe::register_raw(signal_hook::consts::SIGINT, a.as_raw_fd())?;
        println!("Waiting for Ctrl-C...");

        // Receive a byte that indicates the Ctrl-C signal occurred.
        b.read_exact(&mut [0]).await?;

        println!("Done!");
        Ok(())
    })
}