gistfile1.js

var express = require('express'),
    app = express(),
    server = require('http').createServer(app),
    io = require('socket.io').listen(server),
    port = 8080;

server.listen(port);

// it's here to serve my static content (js, css, etc)
var oneDay = 86400000;
app.use(express.static(__dirname, {maxAge: oneDay}));

io.sockets.on('connection', function(socket) {
    enviaFila();
    
    // other stuffs...

});

function enviaFila() {
    // my stuff...
    
    io.sockets.emit('fila', {message: 'my message'});
}

io.sockets.on('connection', function (socket) { 
  enviaFila(socket);
});

......

function enviaFila(socket) { 
  socket.emit('fila', { message: 'my message' });
}