node.js で同期的read

var fs = require('fs');

var fd = fs.openSync("test.txt", "r"); // test.txt = abcdefghij

var buffer = new Buffer(4096);

var len = fs.readSync(fd, buffer, 0, 5, null);

console.log(len, buffer.toString("ascii", 0, len)); // 5 abcde

fs.closeSync(fd);