From fff61ea025e9ef31a2a467e685cbda3277d5237f Mon Sep 17 00:00:00 2001
From: Thomas Heller <theller@ctypes.org>
Date: Thu, 6 Apr 2006 15:23:16 +0000
Subject: [PATCH] Expose RTLD_LOCAL and RTLD_GLOBAL always from the _ctypes
 extension module. If RTLD_LOCAL is not #defined in any header file (Windows),
 set it to 0. If RTLD_GLOBAL is not #defined, set it equal to RTLD_LOCAL.

This should fix ctypes on cygwin.
---
 Lib/ctypes/__init__.py    |  6 +-----
 Lib/ctypes/_loader.py     |  7 ++-----
 Modules/_ctypes/_ctypes.c | 14 ++++++++++++--
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py
index a005594d66..28ac1807be 100644
--- a/Lib/ctypes/__init__.py
+++ b/Lib/ctypes/__init__.py
@@ -9,11 +9,7 @@ from _ctypes import Union, Structure, Array
 from _ctypes import _Pointer
 from _ctypes import CFuncPtr as _CFuncPtr
 from _ctypes import __version__ as _ctypes_version
-try:
-    from _ctypes import RTLD_LOCAL, RTLD_GLOBAL
-except (ImportError, AttributeError):
-    RTLD_GLOBAL = RTLD_LOCAL = None
-
+from _ctypes import RTLD_LOCAL, RTLD_GLOBAL
 from _ctypes import ArgumentError
 
 from struct import calcsize as _calcsize
diff --git a/Lib/ctypes/_loader.py b/Lib/ctypes/_loader.py
index 6ab02961a1..7a48c1c4ba 100644
--- a/Lib/ctypes/_loader.py
+++ b/Lib/ctypes/_loader.py
@@ -1,14 +1,11 @@
-# WORK IN PROGRESS!  DO NOT (yet) USE!
 import sys, os
 import ctypes
 
-__all__ = ["LibraryLoader", "RTLD_LOCAL", "RTLD_GLOBAL"]
-
 if os.name in ("nt", "ce"):
     from _ctypes import LoadLibrary as dlopen
-    RTLD_LOCAL = RTLD_GLOBAL = None
 else:
-    from _ctypes import dlopen, RTLD_LOCAL, RTLD_GLOBAL
+    from _ctypes import dlopen
+from _ctypes import RTLD_LOCAL, RTLD_GLOBAL
 
 # _findLib(name) returns an iterable of possible names for a library.
 if os.name in ("nt", "ce"):
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 0743ec9c2d..b9cac399c9 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -4575,10 +4575,20 @@ init_ctypes(void)
 	PyModule_AddObject(m, "_wstring_at_addr", PyLong_FromVoidPtr(wstring_at));
 #endif
 
-#ifdef RTLD_LOCAL
+/* If RTLD_LOCAL is not defined (Windows!), set it to zero. */
+#ifndef RTLD_LOCAL
+#define RTLD_LOCAL 0
+#endif
+
+/* If RTLD_GLOBAL is not defined (cygwin), set it to the same value as
+   RTLD_LOCAL.
+*/
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL RTLD_LOCAL
+#endif
+
 	PyModule_AddObject(m, "RTLD_LOCAL", PyInt_FromLong(RTLD_LOCAL));
 	PyModule_AddObject(m, "RTLD_GLOBAL", PyInt_FromLong(RTLD_GLOBAL));
-#endif
 	
 	PyExc_ArgError = PyErr_NewException("ctypes.ArgumentError", NULL, NULL);
 	if (PyExc_ArgError) {
-- 
2.40.0