All files / lib/internal/process signal.js

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100% Functions 3/3
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'use strict';
 
const {
  FunctionPrototypeBind,
  SafeMap,
} = primordials;
 
const {
  errnoException,
} = require('internal/errors');
 
const { signals } = internalBinding('constants').os;
 
let Signal;
const signalWraps = new SafeMap();
 
function isSignal(event) {
  return typeof event === 'string' && signals[event] !== undefined;
}
 
// Detect presence of a listener for the special signal types
function startListeningIfSignal(type) {
  if (isSignal(type) && !signalWraps.has(type)) {
    if (Signal === undefined)
      Signal = internalBinding('signal_wrap').Signal;
    const wrap = new Signal();
 
    wrap.unref();
 
    wrap.onsignal = FunctionPrototypeBind(process.emit, process, type, type);
 
    const signum = signals[type];
    const err = wrap.start(signum);
    if (err) {
      wrap.close();
      throw errnoException(err, 'uv_signal_start');
    }
 
    signalWraps.set(type, wrap);
  }
}
 
function stopListeningIfSignal(type) {
  const wrap = signalWraps.get(type);
  if (wrap !== undefined && process.listenerCount(type) === 0) {
    wrap.close();
    signalWraps.delete(type);
  }
}
 
module.exports = {
  startListeningIfSignal,
  stopListeningIfSignal
};