code: function open(affixes, callback) {
    var filePath = generateName(affixes, 'f-');
    fs.open(filePath, RDWR_EXCL, parseInt('0600', 8), function(err, fd) {
      if (!err) {
        deleteFileOnExit(filePath);
      }
      if (callback) {
        callback(err, {path: filePath, fd: fd});
      }
    });
  }
docs: /* FILES