node/test/parallel/test-signal-handler.js

'use strict';

const common = require('../common');
const assert = require('assert');

if (common.isWindows) {
  console.log('1..0 # Skipped: SIGUSR1 and SIGHUP signals are not supported');
  return;
}

console.log('process.pid: ' + process.pid);

let first = 0;
let second = 0;

var sighup = false;

process.on('SIGUSR1', function() {
  console.log('Interrupted by SIGUSR1');
  first += 1;
});

process.on('SIGUSR1', function() {
  second += 1;
  setTimeout(function() {
    console.log('End.');
    process.exit(0);
  }, 5);
});

var i = 0;
setInterval(function() {
  console.log('running process...' + ++i);

  if (i == 5) {
    process.kill(process.pid, 'SIGUSR1');
  }
}, 1);

// Test on condition where a watcher for SIGNAL
// has been previously registered, and `process.listeners(SIGNAL).length === 1`
process.on('SIGHUP', function() {});
process.removeAllListeners('SIGHUP');
process.on('SIGHUP', function() { sighup = true; });
process.kill(process.pid, 'SIGHUP');

process.on('exit', function() {
  assert.equal(1, first);
  assert.equal(1, second);
  assert.equal(true, sighup);
});