libpq sockets on win32

I found that sending more than 16k of data in a SQL statement caused a
problem.  I was using PyGreSQL but narrowed the error down to
"\postgresql-7.1.2\src\interfaces\libpq\fe-misc.c" pqReadData() and
pqFlush().  After some poking around, it looked like recv was setting
errno to ENOENT for some reason.  I figured out why today.  Win32
sockets don't set errno at all.  ENOENT was just left in errno from
some earlier call.

This article describes the problem and work around.
http://msdn.microsoft.com/library/psdk/winsock/ovrvw3_26ia.htm

I haven't done much C coding in a few years and don't want to break
other code by blindly doing:

#define errno WSAGetLastError

Does anyone that knows this code want to take a crack at it?

Thanks,
Jeff