.. master:: string get_master_uid(void)

  Return the string to be used as root-uid. Under !strict_euids, the function is expendable.

  :history 3.2.1@40 introduced: replaces ``get_root_uid()``.

  .. seealso:: :master:`get_bb_uid`, :master:`get_master_uid`, :concept:`uids`,  :efun:`creator`