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 5523x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 16767x 16767x 16767x 23x 23x 16767x 16767x 170x 170x 170x 170x 170x 170x 170x 170x 170x 170x 170x       170x 170x 170x 16767x 23x 569x 569x 569x 38x 38x 38x 569x 23x 23x 23x 23x 23x  
'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
};