debian - What is the best way to watch and signal file changes to a node.js app? -

i periodically rsync code changes production server. have following cluster code creates workers main app.

var cluster = require('cluster'); function startworker() {     var worker = cluster.fork();     console.log('cluster: worker %d started', worker.id); }  if(cluster.ismaster){     require('os').cpus().foreach(function(){         startworker();     });     // log workers disconnect; if worker disconnects,     // should exit, we'll wait exit event spawn     // new worker replace     cluster.on('disconnect', function(worker){         console.log('cluster: worker %d disconnected cluster.',         worker.id);     });      // when worker dies (exits), create worker replace     cluster.on('exit', function(worker, code, signal){         console.log('cluster: worker %d died exit code %d (%s)',         worker.id, code, signal);         startworker();     }); } else {     // start our app on worker; see meadowlark.js     require('./app.js')(); } 

this article shows how listen signal (in articles case sigusr2, restart workers). in nutshell like:

process.on("sigusr2", function() {       //code disconnect workers, delete cache , restart workers }); 

my questions is: - sigusr2 best way signal process should reload workers ? if want send additional information ? - sending signal ? os feature can set watch file or directory ? how do ?

note: - rather use os level feature not related node.js. example, posts suggest using node.js specific modules "naught" etc, rather not use "naught". :)

the linux kernel supports file system notification subsystem called inotify. can use nodejs: https://github.com/c4milo/node-inotify