cluster-sig.js

var cluster = require('cluster');

if (cluster.isMaster) {
    cluster.fork();

    cluster.on('exit', function(worker, code, signal) {
        console.log('Worker exited:', worker.process.pid);
    });
    setTimeout(function () {
      for (var id in cluster.workers) {
        var worker = cluster.workers[id];
        process.kill(worker.pid, 'SIGUSR2');
      }
    }, 2000);
} else {
    process.on('SIGUSR2', function() {
        //WHY DOES THIS NOT GET CALLED? http://nodejs.org/api/cluster.html
        console.log('SIGUSR2 called', process.pid);
    });
    console.log('Worker listening for SIGUSR2', process.pid);
}