test/parallel/test-signal-handler.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// following conditions:
//
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// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';

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

if (common.isWindows)
  common.skip('SIGUSR1 and SIGHUP signals are not supported');
if (!common.isMainThread)
  common.skip('Signal handling in Workers is not supported');

console.log(`process.pid: ${process.pid}`);

process.on('SIGUSR1', common.mustCall());

process.on('SIGUSR1', common.mustCall(function() {
  setTimeout(function() {
    console.log('End.');
    process.exit(0);
  }, 5);
}));

let 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', common.mustNotCall());
process.removeAllListeners('SIGHUP');
process.on('SIGHUP', common.mustCall());
process.kill(process.pid, 'SIGHUP');