node tail

gistfile1.js

var tail = function(fname, onData) {
    fs.open(fname, 'a+', function(err, fd) {
        puts('fd:'+fd);
        if (err) {
            puts('error!: '+err);
            setTimeout(function(){
                tail(fname, onData);
            }, 10);
        } else {
            puts('allocating buffer');
            var size = 1024;
            var buffer = new Buffer(size);
            var reader = function() {
                puts('reading '+fname);
                fs.read(fd, buffer, 0, size, function(err, bytesRead) {
                    puts('read '+bytesRead);
                    callback(buffer.slice(0, bytesRead));
                    reader();
                });
            };
            reader();
        }
    });
};