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1.7 KiB
1.7 KiB
Handle OS Signals
This program makes use of an unstable Deno feature. Learn more about unstable features.
Concepts
- Use the
--unstable
flag to access new or unstable features in Deno - Deno.signal can be used to capture and monitor OS signals
- Use the
dispose()
function of the Deno.signal SignalStream to stop watching the signal
Async iterator example
You can use Deno.signal()
function for handling OS signals:
/**
* async-iterator-signal.ts
*/
console.log("Press Ctrl-C to trigger a SIGINT signal");
for await (const _ of Deno.signal(Deno.Signal.SIGINT)) {
console.log("interrupted!");
Deno.exit();
}
Run with:
deno run --unstable async-iterator-signal.ts
Promise based example
Deno.signal()
also works as a promise:
/**
* promise-signal.ts
*/
console.log("Press Ctrl-C to trigger a SIGINT signal");
await Deno.signal(Deno.Signal.SIGINT);
console.log("interrupted!");
Deno.exit();
Run with:
deno run --unstable promise-signal.ts
Stop watching signals
If you want to stop watching the signal, you can use dispose()
method of the
signal object:
/**
* dispose-signal.ts
*/
const sig = Deno.signal(Deno.Signal.SIGINT);
setTimeout(() => {
sig.dispose();
console.log("No longer watching SIGINT signal");
}, 5000);
console.log("Watching SIGINT signals");
for await (const _ of sig) {
console.log("interrupted");
}
Run with:
deno run --unstable dispose-signal.ts
The above for-await loop exits after 5 seconds when sig.dispose()
is called.