i've spotted a following problem using DBD::Pg under win32. winsock

functions do not set errno, so some normal conditions are treated as
fatal errors. e.g. fetching large tuples fails, as at some point recv()
returns EWOULDBLOCK. here's a patch, which replaces errno with
WSAGetLastError(). i've tried to to affect non-win32 code.

Dmitry Yurtaev

src/interfaces/libpq/win32.h

@@ -21,3 +21,18 @@
  * crypt not available (yet)
  */
 #define crypt(a,b) a
+
+/*
+ * assumes that errno is used for sockets only
+ *
+ */
+
+#undef errno
+#undef EINTR
+#undef EAGAIN	/* doesn't apply on sockets */
+
+#define errno WSAGetLastError()
+#define EINTR WSAEINTR
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#define ECONNRESET WSAECONNRESET
+#define EINPROGRESS WSAEINPROGRESS