This is roughly socket2.diff from issue 1378, with a few changes applied
to ssl.py (no need to test whether we can dup any more).
Regular sockets no longer have a _base, but we still have explicit
reference counting of socket objects for the benefit of makefile();
using duplicate sockets won't work for SSLSocket.
diff --git a/Include/longobject.h b/Include/longobject.h
index 6bf3409..16abd0e 100644
--- a/Include/longobject.h
+++ b/Include/longobject.h
@@ -26,6 +26,15 @@
PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLong(PyObject *);
PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLongMask(PyObject *);
+/* Used by socketmodule.c */
+#if SIZEOF_SOCKET_T <= SIZEOF_LONG
+#define PyLong_FromSocket_t(fd) PyLong_FromLong((SOCKET_T)(fd))
+#define PyLong_AsSocket_t(fd) (SOCKET_T)PyLong_AsLong(fd)
+#else
+#define PyLong_FromSocket_t(fd) PyLong_FromLongLong(((SOCKET_T)(fd));
+#define PyLong_AsSocket_t(fd) (SOCKET_T)PyLong_AsLongLong(fd)
+#endif
+
/* For use by intobject.c only */
PyAPI_DATA(int) _PyLong_DigitValue[256];