In a tokio project I want to wait form both SIGTERM and SIGINT
To just wait for one of the signal works fine:
tracing::debug!("Waiting for the end of the world");
signal(SignalKind::terminate())?.recv().await;
But when I try to use tokio::select! from this answer in users.rustlang.org
use tokio::signal::unix::{signal, SignalKind};
tokio::select! {
_ = signal(SignalKind::interrupt())?.recv() => println!("SIGINT"),
_ = signal(SignalKind::terminate())?.recv() => println!("SIGTERM"),
}
println!("terminating the process...");
I get an error about a temporary variable being freed while still in use.
error[E0716]: temporary value dropped while borrowed
--> src/main.rs:495:13
|
494 | let ans = tokio::select! {
| _______________-
495 | | _ = signal(SignalKind::interrupt())?.recv() => println!("SIGINT"),
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
496 | | _ = signal(SignalKind::terminate())?.recv() => println!("SIGTERM"),
497 | | };
| | -
| | |
| |_____temporary value is freed at the end of this statement
| borrow might be used here, when `futures` is dropped and runs the destructor for type `(impl futures_util::Future<Output = std::option::Option<()>>, impl futures_util::Future<Output = std::option::Option<()>>)`
Is this still the way to do this?
This question is similar but address a different aspect Programmatically create and listen for multiple signals and a ticking interval with tokio
The example refereed in the question has a small bug. If the Result<Signal> from signal is handled outside of the select! macro there is no temporary variable to outlive its borrowed scope.
println!("Waiting for the end of the world");
let mut sigterm = signal(SignalKind::terminate())?;
let mut sigint = signal(SignalKind::interrupt())?;
tokio::select! {
_ = sigterm.recv() => {println!("SIGTERM Shuting down");},
_ = sigint.recv() => {println!("SIGINT Shuting down");},
};
1