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Re: PQsetNoticeReceiver issues

From: L J Bayuk <ljb220(at)mindspring(dot)com>
To: peter_e(at)gmx(dot)net (Peter Eisentraut)
Cc: jgardner(at)jonathangardner(dot)net (Jonathan Gardner),pgsql-interfaces(at)postgresql(dot)org
Subject: Re: PQsetNoticeReceiver issues
Date: 2004-01-19 02:38:30
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces
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...

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