Re: PQsetNoticeReceiver issues

Peter Eisentraut wrote:
> 
> Jonathan Gardner wrote:
> > I've run into a conundrum with the PQsetNoticeReceiver function call.
> > How do you set it back to the original default? How do you call the
> > appropriate PQnoticeProcessor as well?
> 
> The documentation says:
> 
>  Each of these functions returns the previous notice receiver or 
> processor function pointer, and sets the new value. If you supply a 
> null function pointer, no action is taken, but the current pointer is 
> returned.

Saving and restoring the previous noticeProcessor or noticeReceiver handler
function works, unless they actually made use of the "arg" pass-through
argument.  For example, somewhere you have:    PQsetNoticeProcessor(conn, myNoticeProc, &mydata);

And somewhere else you want to temporarily override the noticeProcessor:    prevNoticeProc = PQsetNoticeProcessor(conn,
newNoticeProc,&newdata);    /* ... Do something which makes a notice ... */
 
    /* Restore previous notice processor */    PQsetNoticeProcessor(conn, prevNoticeProc, ????);    /* Oops, lost the
previous"arg". */
 
Not exactly a huge API hole, but nevertheless...