catacomb/__init__.py: Awful bodge for symbol conflict.

[catacomb-python] / catacomb / __init__.py

diff --git a/catacomb/__init__.py b/catacomb/__init__.py
index 0ce4d04..42b765b 100644 (file)
--- a/catacomb/__init__.py
+++ b/catacomb/__init__.py
@@ -27,6 +27,8 @@ from __future__ import with_statement
 
 from binascii import hexlify as _hexify, unhexlify as _unhexify
 from contextlib import contextmanager as _ctxmgr
+import DLFCN as _dlfcn
+import os as _os
 from struct import pack as _pack
 import sys as _sys
 import types as _types
@@ -34,8 +36,31 @@ import types as _types
 ###--------------------------------------------------------------------------
 ### Import the main C extension module.
 
+try:
+  _dlflags = _odlflags = _sys.getdlopenflags()
+except AttributeError:
+  _dlflags = _odlflags = -1
+
+## Set the `deep binding' flag.  Python has its own different MD5
+## implementation, and some distributions export `md5_init' and friends so
+## they override our versions, which doesn't end well.  Figure out how to
+## turn this flag on so we don't have the problem.
+if _dlflags >= 0:
+  try: _dlflags |= _dlfcn.RTLD_DEEPBIND
+  except AttributeError:
+    try: _dlflags |= _os.RTLD_DEEPBIND
+    except AttributeError:
+      if _os.uname()[0] == 'Linux': _dlflags |= 8 # magic knowledge
+      else: pass # can't do this.
+  _sys.setdlopenflags(_dlflags)
+
 import _base
 
+if _odlflags >= 0:
+  _sys.setdlopenflags(_odlflags)
+
+del _dlflags, _odlflags
+
 ###--------------------------------------------------------------------------
 ### Basic stuff.