All files / lib/internal/process signal.js

94.44% Statements 51/54
90.9% Branches 10/11
100% Functions 3/3
94.44% Lines 51/54

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 5519x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 16588x 16588x 16588x 19x 19x 16588x 16588x 165x 165x 165x 165x 165x 165x 165x 165x 165x 165x 165x       165x 165x 165x 16588x 19x 641x 641x 641x 38x 38x 38x 641x 19x 19x 19x 19x 19x  
'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
};