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...