add and migrate constants from ctypes/__init__.pyi to _ctypes.pyi

stdlib/_ctypes.pyi

@@ -2,6 +2,13 @@ import sys
 from ctypes import _CArgObject, _PointerLike
 from typing_extensions import TypeAlias
 
+FUNCFLAG_CDECL: int
+FUNCFLAG_PYTHONAPI: int
+FUNCFLAG_USE_ERRNO: int
+FUNCFLAG_USE_LASTERROR: int
+RTLD_GLOBAL: int
+RTLD_LOCAL: int
+
 if sys.version_info >= (3, 11):
     CTYPES_MAX_ARGCOUNT: int
 

stdlib/ctypes/__init__.pyi

@@ -5,15 +5,17 @@ from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
 from typing import Any, ClassVar, Generic, TypeVar, Union as _UnionT, overload
 from typing_extensions import TypeAlias
 
+# TODO: import these from _ctypes once it no longer breaks pytype
+RTLD_GLOBAL: int
+RTLD_LOCAL: int
+
 if sys.version_info >= (3, 9):
     from types import GenericAlias
 
 _T = TypeVar("_T")
 _DLLT = TypeVar("_DLLT", bound=CDLL)
 _CT = TypeVar("_CT", bound=_CData)
 
-RTLD_GLOBAL: int
-RTLD_LOCAL: int
 DEFAULT_MODE: int
 
 class CDLL:

tests/pytype_exclude_list.txt

@@ -10,6 +10,12 @@ stubs/mysqlclient/MySQLdb/__init__.pyi
 stubs/mysqlclient/MySQLdb/connections.pyi
 stubs/mysqlclient/MySQLdb/cursors.pyi
 
+# errors about circular imports
+stdlib/ctypes/__init__.pyi
+stdlib/ctypes/util.pyi
+stdlib/ctypes/wintypes.pyi
+stdlib/_ctypes.pyi
+
 # _pb2.pyi have some constructs that break pytype
 # Eg
 # pytype.pyi.parser.ParseError:   File: "/Users/nipunn/src/typeshed/third_party/2and3/google/protobuf/descriptor_pb2.pyi", line 195

tests/stubtest_allowlists/py3_common.txt

@@ -341,16 +341,10 @@ wave.Wave_write.initfp
 
 _ctypes.Array
 _ctypes.CFuncPtr
-_ctypes.FUNCFLAG_CDECL
-_ctypes.FUNCFLAG_PYTHONAPI
-_ctypes.FUNCFLAG_USE_ERRNO
-_ctypes.FUNCFLAG_USE_LASTERROR
 _ctypes.POINTER
 _ctypes.PyObj_FromPtr
 _ctypes.Py_DECREF
 _ctypes.Py_INCREF
-_ctypes.RTLD_GLOBAL
-_ctypes.RTLD_LOCAL
 _ctypes.Structure
 _ctypes.Union
 _ctypes.addressof