Function PQsocket

src/interfaces/libpq/fe-connect.c:7011–7017

* In Windows, socket values are unsigned, and an invalid socket value * (INVALID_SOCKET) is ~0, which equals -1 in comparisons (with no compiler * warning). Ideally we would return an unsigned value for PQsocket() on * Windows, but that would cause the function's return value to differ from * Unix, so we just return -1 for invalid sockets. * http://msdn.microsoft.com/en-us/library/windows/des

 * http://stackoverflow.com/questions/10817252/why-is-invalid-socket-defined-as-0-in-winsock2-h-c
 */
int
PQsocket(const PGconn *conn)
{
	if (!conn)
		return -1;
	return (conn->sock != PGINVALID_SOCKET) ? conn->sock : -1;
}

int
PQbackendPID(const PGconn *conn)