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doc: add note for handling signal events in trace events #41438

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Jan 21, 2022
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doc: add note for handling signal events in trace events #41438

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doc: add note for handling signal events in trace events
thedull Jan 7, 2022
2a51708
doc: added exit code and comment to code example
thedull Jan 18, 2022
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11 changes: 11 additions & 0 deletions doc/api/tracing.md
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,17 @@ string that supports `${rotation}` and `${pid}`:
node --trace-event-categories v8 --trace-event-file-pattern '${pid}-${rotation}.log' server.js
```

To guarantee that the log file is properly generated after signal events like
`SIGINT`, `SIGTERM`, or `SIGBREAK`, make sure to have the appropriate handlers
in your code, such as:

```js
process.on('SIGINT', function onSigint() {
console.info('Received SIGINT.');
process.exit(130); // Or applicable exit code depending on OS and signal
});
```

The tracing system uses the same time source
as the one used by `process.hrtime()`.
However the trace-event timestamps are expressed in microseconds,
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