spawn_wrap.js

var wrap_spawn = function (arg_spawn, cb_on_close) {
    var child = spawn.apply(null, arg_spawn);
    var stdout = [];
    var stderr = [];
    child.stdout.on('data', function (data) {
        stdout.push(data.toString());
    });
    child.stderr.on('data', function (data) {
        stderr.push(data.toString());
    });
    child.once('close', function (code) {
        cb_on_close(code, stdout.join(''), stderr.join(''));
        child.stdout.removeAllListeners();
        child.stderr.removeAllListeners();
    });
};