I found Chris Wellons’ endlessh
to be very neat, so I wrote a short one in Rust. This compiles down to about
337kB after stripping metadata on the current-thread flavor of tokio.
If you want to try it yourself, you can run it with ./binname [PORT NUMBER].
use std::{env, time::Duration};
use tokio::{self, io::AsyncWriteExt, net::TcpListener, time::interval};
#[tokio::main]
async fn main() {
let port: String = env::args().skip(1).collect();
let listener = TcpListener::bind(format!("0.0.0.0:{}", port))
.await
.expect("failed to bind to port");
loop {
if let Ok((mut stream, _)) = listener.accept().await {
tokio::spawn(async move {
let mut interval = interval(Duration::from_secs(5));
loop {
if let Err(e) = stream.write(b"\n").await {
eprintln!("{}", e);
}
interval.tick().await;
}
});
}
}
}