offset_gbytes, 
                           u_int32_t offset_bytes, u_int32_t size, 
                           u_int8_t *buf, void *handle),
        int (**close_func)(DB_ENV *, const char *dbname, void *handle));  </pre>
      <p>
         The <code class="methodname">DB_ENV-&gt;get_backup_callbacks()</code> method
         retrieves the three callback functions which can be used by the
         <a class="xref" href="envbackup.html" title="DB_ENV-&gt;backup()">DB_ENV-&gt;backup()</a>
         or
         <