Merged revisions 64976-64977 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r64976 | thomas.heller | 2008-07-15 21:39:38 +0200 (Tue, 15 Jul 2008) | 3 lines

  Issue #3313: Contrary to the man page, a failed dlopen() call does not
  always set a dlerror() message.
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  r64977 | thomas.heller | 2008-07-15 21:44:25 +0200 (Tue, 15 Jul 2008) | 2 lines

  Add Victor Stinner, he provided the patch for issue #3313.
........

Misc/ACKS

@@ -771,3 +771,4 @@ Uwe Zessin
 Amaury Forgeot d'Arc
 Peter strand
 Tarek Ziad
+Victor Stinner

Misc/NEWS

@@ -27,6 +27,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #3313: Fixed a crash when a failed dlopen() call does not set
+  a valid dlerror() message.
+
 - Issue #3258: Fixed a crash when a ctypes POINTER type to an
   incomplete structure was created.
 

Modules/_ctypes/callproc.c

@@ -1383,8 +1383,11 @@ static PyObject *py_dl_open(PyObject *self, PyObject *args)
 	mode |= RTLD_NOW;
 	handle = ctypes_dlopen(name, mode);
 	if (!handle) {
+		char *errmsg = ctypes_dlerror();
+		if (!errmsg)
+			errmsg = "dlopen() error";
 		PyErr_SetString(PyExc_OSError,
-				       ctypes_dlerror());
+				       errmsg);
 		return NULL;
 	}
 	return PyLong_FromVoidPtr(handle);