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Add signal handlers (denoland/deno#3757)
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kt3k authored and denobot committed Feb 1, 2021
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@@ -428,6 +428,39 @@ Uncaught NotFound: No such file or directory (os error 2)
at handleAsyncMsgFromRust (deno/js/dispatch.ts:27:17)
```

### Handle OS Signals

[API Reference](https://deno.land/typedoc/index.html#signal)

You can use `Deno.signal()` function for handling OS signals.

```
for await (const _ of Deno.signal(Deno.Signal.SIGINT)) {
console.log("interrupted!");
}
```

`Deno.signal()` also works as a promise.

```
await Deno.signal(Deno.Singal.SIGINT);
console.log("interrupted!");
```

If you want to stop watching the signal, you can use `dispose()` method of the
signal object.

```
const sig = Deno.signal(Deno.Signal.SIGINT);
setTimeout(() => { sig.dispose(); }, 5000);
for await (const _ of sig) {
console.log("interrupted");
}
```

The above for-await loop exits after 5 seconds when sig.dispose() is called.

### Linking to third party code

In the above examples, we saw that Deno could execute scripts from URLs. Like

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