async read of a file

1-cat.js

/* open a file and print its contents */

var fs = require('fs');

var cat_file = function(path,stream,completion_callback) {
    fs.open(path,'rs',function(err,fd) {

        var buf_size = 4096;
        var buf = new Buffer(buf_size);

        var read_file_bytes = function (fd,pos) {
            fs.read(fd,buf,0,buf_size,pos,function(err,bytesRead,buf) {
                if (bytesRead === 0) {
                    completion_callback(fd);
                } else {
                    stream.write(buf.toString('utf8',0,bytesRead));
                    read_file_bytes(fd,pos+bytesRead);
                }
            });
        }

        read_file_bytes(fd, 0);

        // this was my problem, it actually told me so!
        // fs.closeSync(fd);
    });

}

cat_file("1-cat.js",process.stdout,function(fd) {
    console.log(fd);
    console.log("done catting file!!");
});