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Re: PQinitSSL broken in some use casesf

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Andrew Chernow <ac(at)esilo(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PQinitSSL broken in some use casesf
Date: 2009-02-10 16:57:17
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Tue, Feb 10, 2009 at 11:14 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>>>> Well, you could create PQinitSSLExtended, but, as you say, the use
>>>> case is pretty narrow...
>>>> It would help if there were a PQgetLibraryVersion() function.
>>> Help how?  There is nothing an app can do to work around the problem
>>> AFAICS.  Or if there were, we should just document it and not change
>>> the code --- the use case for this is evidently too narrow to justify
>>> complicating libpq's API even more.
>> It would let you assert that you were running against a version of
>> libpq that has the functionality that you are attempting to use, thus
>> eliminating the risk of silent failure.
> If that's all you want, then PQinitSSLExtended is a perfectly good
> answer.  Your app will fail to link if you try to use a library
> version that hasn't got it.
> I think documenting the workaround is a sufficient answer though.

I don't think you can get way with that this time.  wsa cleanup was a
mainly harmless side effect.  This is a nasty 'maybe it works, maybe
it doesn't' virtually impossible to debug problem.  We caught it on a
particular platform (windows, iirc) when deep in our code a mutex call
deadlocked when it shouldn't have, after weeks of working ok.
debugging nightmare.

PQinitSSL is *broken*.  It's always been broken.  Since it already
takes a parameter, I say add a special switch...the backwards
compatibility danger doesn't seem too bad.


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