lib/dirio.js
function _readChild(stat, dirpath, name, callback) {
  _read(stat, path.join(dirpath, name), callback);
}
function _readChild(stat, dirpath, name, callback) {
  _read(stat, path.join(dirpath, name), callback);
}
function _readChild ( stat , dirpath , name , callback ) { _read ( stat , path . join ( dirpath , name ) , callback ) ; }
Ensures the child of the parent directory may provide its data.
@param {Function} stat - Function of fs module fs.stat or fs.lstat.
@param {String} dirpath - Path of the parent directory on file system.
@param {String} name - File name of the child.
@param {Function} callback - Callback that expects a possible error
and child data.
Ensures the child of the parent directory may provide its data .