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freetds - RE: [freetds] INT_CANCEL return from DbLib error handler fails

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  • From: "Lowden, James K" <LowdenJK AT bernstein.com>
  • To: "'FreeTDS Development Group'" <freetds AT lists.ibiblio.org>
  • Subject: RE: [freetds] INT_CANCEL return from DbLib error handler fails
  • Date: Fri, 2 May 2003 17:30:09 -0400

> 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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