here is no
       way of indicating a failure from <CODE
CLASS="FUNCTION"
>PQclear</CODE
>.  Also,
       an event procedure failure should not abort the process of cleaning up
       unwanted memory.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="LIBPQ-EVENTS-PROC"
>31.13.2. Event Callback Procedure</A
></H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="LIBPQ-PGEVENTPROC"
></A
><TT
CLASS="LITERAL"
>PGEventProc</TT
>
      </DT
><DD
><P
>       <TT
CLASS="LITE