[3.13] pythongh-133982: Run unclosed file test on all io implementations (pythongh-134165) (pythongh-134434)

Update `test_io` `_check_warn_on_dealloc` to use `self.` to dispatch to
different I/O implementations.

Update the `_pyio` implementation to match expected behavior, using the
same `_dealloc_warn` design as the C implementation uses to report the
topmost `__del__` object.

The FileIO one now matches all the others, so can use IOBase. There was
a missing check on closing (self._fd must be valid), add that check
(cherry picked from commit 5b0e827)

Co-authored-by: Cody Maloney <[email protected]>

Author: miss-islington

Lib/_pyio.py

@@ -413,6 +413,9 @@ def __del__(self):
         if closed:
             return
 
+        if dealloc_warn := getattr(self, "_dealloc_warn", None):
+            dealloc_warn(self)
+
         # If close() fails, the caller logs the exception with
         # sys.unraisablehook. close() must be called at the end at __del__().
         self.close()
@@ -859,6 +862,10 @@ def __repr__(self):
         else:
             return "<{}.{} name={!r}>".format(modname, clsname, name)
 
+    def _dealloc_warn(self, source):
+        if dealloc_warn := getattr(self.raw, "_dealloc_warn", None):
+            dealloc_warn(source)
+
     ### Lower-level APIs ###
 
     def fileno(self):
@@ -1599,12 +1606,11 @@ def __init__(self, file, mode='r', closefd=True, opener=None):
             raise
         self._fd = fd
 
-    def __del__(self):
+    def _dealloc_warn(self, source):
         if self._fd >= 0 and self._closefd and not self.closed:
             import warnings
-            warnings.warn('unclosed file %r' % (self,), ResourceWarning,
+            warnings.warn(f'unclosed file {source!r}', ResourceWarning,
                           stacklevel=2, source=self)
-            self.close()
 
     def __getstate__(self):
         raise TypeError(f"cannot pickle {self.__class__.__name__!r} object")
@@ -1748,7 +1754,7 @@ def close(self):
         """
         if not self.closed:
             try:
-                if self._closefd:
+                if self._closefd and self._fd >= 0:
                     os.close(self._fd)
             finally:
                 super().close()
@@ -2640,6 +2646,10 @@ def readline(self, size=None):
     def newlines(self):
         return self._decoder.newlines if self._decoder else None
 
+    def _dealloc_warn(self, source):
+        if dealloc_warn := getattr(self.buffer, "_dealloc_warn", None):
+            dealloc_warn(source)
+
 
 class StringIO(TextIOWrapper):
     """Text I/O implementation using an in-memory buffer.

Lib/test/test_io.py

@@ -4386,7 +4386,7 @@ def test_abc_inheritance_official(self):
         self._check_abc_inheritance(io)
 
     def _check_warn_on_dealloc(self, *args, **kwargs):
-        f = open(*args, **kwargs)
+        f = self.open(*args, **kwargs)
         r = repr(f)
         with self.assertWarns(ResourceWarning) as cm:
             f = None
@@ -4415,7 +4415,7 @@ def cleanup_fds():
         r, w = os.pipe()
         fds += r, w
         with warnings_helper.check_no_resource_warning(self):
-            open(r, *args, closefd=False, **kwargs)
+            self.open(r, *args, closefd=False, **kwargs)
 
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_warn_on_dealloc_fd(self):

Misc/NEWS.d/next/Library/2025-05-17-20-23-57.gh-issue-133982.smS7au.rst

@@ -0,0 +1,3 @@
+Emit :exc:`RuntimeWarning` in the Python implementation of :mod:`io` when
+the :term:`file-like object <file object>` is not closed explicitly in the
+presence of multiple I/O layers.