2 unstable releases

0.2.0 Feb 8, 2023
0.1.0 Jun 10, 2019

#258 in Asynchronous

Apache-2.0 OR MIT

255 lines


Build License Cargo Documentation

Asynchronous signal handling.

This crate provides the Signals type, which can be used to listen for POSIX signals asynchronously. It can be seen as an asynchronous version of signal_hook::iterator::Signals.

As of the time of writing, this crate is unix-only.


This crate uses the signal_hook_registry crate to register a listener for each signal. That listener will then send a message through a Unix socket to the Signals type, which will receive it and notify the user. Asynchronous notification is done through the async-io crate.


use async_signal::{Signal, Signals};
use futures_lite::prelude::*;
use signal_hook::low_level;

// Register the signals we want to receive.
let signals = Signals::new(&[

// Wait for a signal to be received.
while let Some(signal) = signals.next().await {
    // Print the signal.
    eprintln!("Received signal {:?}", signal);

    // After printing it, do whatever the signal was supposed to do in the first place.
    low_level::emulate_default_handler(signal.unwrap() as i32).unwrap();


Licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


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