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 5520x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 17084x 17084x 17084x 20x 20x 17084x 17084x 188x 188x 188x 188x 188x 188x 188x 188x 188x 188x 188x       188x 188x 188x 17084x 20x 610x 610x 610x 38x 38x 38x 610x 20x 20x 20x 20x 20x  
'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
};