crates/tokio/tests/signal_drop_recv.rs

#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
#![cfg(unix)]

mod support {
    pub mod signal;
}
use support::signal::send_signal;

use tokio::signal::unix::{signal, SignalKind};

#[tokio::test]
async fn drop_then_get_a_signal() {
    let kind = SignalKind::user_defined1();
    let sig = signal(kind).expect("failed to create first signal");
    drop(sig);

    send_signal(libc::SIGUSR1);
    let mut sig = signal(kind).expect("failed to create second signal");

    let _ = sig.recv().await;
}