[freetds] RE: INT_CANCEL return from DbLib error handler fail s

Lowden, James K LowdenJK at bernstein.com
Mon May 5 10:45:08 EDT 2003

> From: Cooperstock, Dan [mailto:dan.cooperstock at hepcoe.com]
> Sent: May 5, 2003 9:53 AM
> I wish I had the time to examine and fix this, but I really 
> don't. Isn't
> this something the normal developers of the package would be 
> interested in fixing?

Yes, Dan.  Thanks for the problem report.  I added it to our TODO list.  


> -----Original Message-----
> From: Lowden, James K [mailto:LowdenJK at bernstein.com]
> Sent: Friday, May 02, 2003 5:30 PM
> To: 'FreeTDS Development Group'
> Subject: RE: [freetds] INT_CANCEL return from DbLib error 
> handler fails
> > From: Cooperstock, Dan [mailto:dan.cooperstock at hepcoe.com]
> > Sent: May 2, 2003 2:16 PM
> >
> > I'm returning in INT_CANCEL from the error handler I set with
> > dberrhandle() in a DbLibrary application using FreeTDS.
> > 
> > As I understand it, that should cause working functions, like
> > dbsqlexec,
> > which threw an error, to get a bad (not SUCCEED) return value.
> You understand correctly.  Looking at the code, our implementation is
> defective.  Which is odd, because we had a very involved 
> discussion about
> this about six months ago.  Apparently we solved the problem 
> in theory but
> never got a round tuit.  Maybe the different libraries have 
> conflicting
> semantics, and we're not set up for that. 
> If you're interested in fixing this, you'll need a current 
> snapshot, or at
> least upgrade to 0.61. 
> The relevant function is (assuming it's a server-side message 
> you're talking
> about) is tds_process_msg() in src/tds/token.c:2019.  Near 
> the end of that
> function, we call the installed handler, but ignore its 
> return code and
> return TDS_SUCCEED. 
> I don't know how fastidious we are about propogating the 
> error back up the
> stack. 
> --jkl
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