From cddecf228a3160bb3f1c256b600be782e69b23ff Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 4 Nov 2024 11:58:20 +0100
Subject: [PATCH] [3.13] gh-125783: Add more tests to prevent regressions with
 the combination of ctypes and metaclasses. (GH-126126) (GH-126275)

gh-125783: Add more tests to prevent regressions with the combination of ctypes and metaclasses. (GH-126126)
(cherry picked from commit 6c67446a6e73ab0e9a26e4360412cbd2f5550e66)

Co-authored-by: Jun Komoda <45822440+junkmd@users.noreply.github.com>
---
 .../test_ctypes/test_c_simple_type_meta.py    | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/Lib/test/test_ctypes/test_c_simple_type_meta.py b/Lib/test/test_ctypes/test_c_simple_type_meta.py
index fa5144a3ca01bb..eb77d6d7782478 100644
--- a/Lib/test/test_ctypes/test_c_simple_type_meta.py
+++ b/Lib/test/test_ctypes/test_c_simple_type_meta.py
@@ -85,3 +85,68 @@ class Sub(CtBase):
 
         self.assertIsInstance(POINTER(Sub), p_meta)
         self.assertTrue(issubclass(POINTER(Sub), Sub))
+
+    def test_creating_pointer_in_dunder_init_1(self):
+        class ct_meta(type):
+            def __init__(self, name, bases, namespace):
+                super().__init__(name, bases, namespace)
+
+                # Avoid recursion.
+                # (See test_creating_pointer_in_dunder_new_1)
+                if bases == (c_void_p,):
+                    return
+                if issubclass(self, PtrBase):
+                    return
+                if bases == (object,):
+                    ptr_bases = (self, PtrBase)
+                else:
+                    ptr_bases = (self, POINTER(bases[0]))
+                p = p_meta(f"POINTER({self.__name__})", ptr_bases, {})
+                ctypes._pointer_type_cache[self] = p
+
+        class p_meta(PyCSimpleType, ct_meta):
+            pass
+
+        class PtrBase(c_void_p, metaclass=p_meta):
+            pass
+
+        class CtBase(object, metaclass=ct_meta):
+            pass
+
+        class Sub(CtBase):
+            pass
+
+        class Sub2(Sub):
+            pass
+
+        self.assertIsInstance(POINTER(Sub2), p_meta)
+        self.assertTrue(issubclass(POINTER(Sub2), Sub2))
+        self.assertTrue(issubclass(POINTER(Sub2), POINTER(Sub)))
+        self.assertTrue(issubclass(POINTER(Sub), POINTER(CtBase)))
+
+    def test_creating_pointer_in_dunder_init_2(self):
+        class ct_meta(type):
+            def __init__(self, name, bases, namespace):
+                super().__init__(name, bases, namespace)
+
+                # Avoid recursion.
+                # (See test_creating_pointer_in_dunder_new_2)
+                if isinstance(self, p_meta):
+                    return
+                p = p_meta(f"POINTER({self.__name__})", (self, c_void_p), {})
+                ctypes._pointer_type_cache[self] = p
+
+        class p_meta(PyCSimpleType, ct_meta):
+            pass
+
+        class Core(object):
+            pass
+
+        class CtBase(Core, metaclass=ct_meta):
+            pass
+
+        class Sub(CtBase):
+            pass
+
+        self.assertIsInstance(POINTER(Sub), p_meta)
+        self.assertTrue(issubclass(POINTER(Sub), Sub))