Gets the UUID for the
volume. The reference is typically based on
the file system UUID for the volume in question and should be
considered an opaque string. Returns
NULL if there is no UUID available.
The UUID for
NULL if no UUID
can be computed.
The returned string should be freed with
when no longer needed.
|The caller of the function takes ownership of the data, and is responsible for freeing it.|
|The return value can be |
|The value is a NUL terminated UTF-8 string.|