def test_frozentable(self):
# Python exports a PyImport_FrozenModules symbol. This is a
# pointer to an array of struct _frozen entries. The end of the
# array is marked by an entry containing a NULL name and zero
# size.
# In standard Python, this table contains a __hello__
# module, and a __phello__ package containing a spam
# module.
class struct_frozen(Structure):
_fields_ = [("name", c_char_p),
("code", POINTER(c_ubyte)),
("size", c_int)]
FrozenTable = POINTER(struct_frozen)
ft = FrozenTable.in_dll(pydll, "PyImport_FrozenModules")
# ft is a pointer to the struct_frozen entries:
items = []
for entry in ft:
# This is dangerous. We *can* iterate over a pointer, but
# the loop will not terminate (maybe with an access
# violation;-) because the pointer instance has no size.
if entry.name is None:
break
items.append((entry.name, entry.size))
import sys
if sys.version_info[:2] >= (2, 3):
expected = [("__hello__", 104), ("__phello__", -104), ("__phello__.spam", 104)]
else:
expected = [("__hello__", 100), ("__phello__", -100), ("__phello__.spam", 100)]
self.assertEqual(items, expected)
from ctypes import _pointer_type_cache
del _pointer_type_cache[struct_frozen]
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