var cp = require('child_process'),
	worker;


function spawn(server) {
		
		//进行守护，开启IPC通道，双向通信
    worker = cp.spawn('node', [ server ], {

      stdio: [ 0, 1, 2, 'ipc' ]

    });
		
		//监视子进程，当其崩溃时处理
    worker.on('exit', function (code) {

        if (code !== 0) {
					
					console.log('worker is shut down, restarting...');
          spawn(server);//重启服务

        };

    });
		
		//收到子进程消息
		worker.on('message', function (msg) {

			console.log(msg);

		});
};

function main() {

    spawn('index.js');

    process.on('SIGTERM', function () {

        worker.kill();
        process.exit(0);

    });
};

main();