Issue #21802: The reader in BufferedRWPair now is closed even when closing

writer failed in BufferedRWPair.close().

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 09aa78decd2e0b309d73299192d4b9dd067e8fb3..3ed02e410dc2f77e1ad0e7e26e36a5c3bee6c430 100644 (file)
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1230,8 +1230,10 @@ class BufferedRWPair(BufferedIOBase):
         return self.writer.flush()
 
     def close(self):
-        self.writer.close()
-        self.reader.close()
+        try:
+            self.writer.close()
+        finally:
+            self.reader.close()
 
     def isatty(self):
         return self.reader.isatty() or self.writer.isatty()

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 668b023e48958bd767371fab689e27e66059c6ac..5b2bf46e03b065ca0a23e29bbf73a5771f0744b2 100644 (file)
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1588,6 +1588,53 @@ class BufferedRWPairTest(unittest.TestCase):
         pair.close()
         self.assertTrue(pair.closed)
 
+    def test_reader_close_error_on_close(self):
+        def reader_close():
+            reader_non_existing
+        reader = self.MockRawIO()
+        reader.close = reader_close
+        writer = self.MockRawIO()
+        pair = self.tp(reader, writer)
+        with self.assertRaises(NameError) as err:
+            pair.close()
+        self.assertIn('reader_non_existing', str(err.exception))
+        self.assertTrue(pair.closed)
+        self.assertFalse(reader.closed)
+        self.assertTrue(writer.closed)
+
+    def test_writer_close_error_on_close(self):
+        def writer_close():
+            writer_non_existing
+        reader = self.MockRawIO()
+        writer = self.MockRawIO()
+        writer.close = writer_close
+        pair = self.tp(reader, writer)
+        with self.assertRaises(NameError) as err:
+            pair.close()
+        self.assertIn('writer_non_existing', str(err.exception))
+        self.assertFalse(pair.closed)
+        self.assertTrue(reader.closed)
+        self.assertFalse(writer.closed)
+
+    def test_reader_writer_close_error_on_close(self):
+        def reader_close():
+            reader_non_existing
+        def writer_close():
+            writer_non_existing
+        reader = self.MockRawIO()
+        reader.close = reader_close
+        writer = self.MockRawIO()
+        writer.close = writer_close
+        pair = self.tp(reader, writer)
+        with self.assertRaises(NameError) as err:
+            pair.close()
+        self.assertIn('reader_non_existing', str(err.exception))
+        self.assertIsInstance(err.exception.__context__, NameError)
+        self.assertIn('writer_non_existing', str(err.exception.__context__))
+        self.assertFalse(pair.closed)
+        self.assertFalse(reader.closed)
+        self.assertFalse(writer.closed)
+
     def test_isatty(self):
         class SelectableIsAtty(MockRawIO):
             def __init__(self, isatty):

diff --git a/Misc/NEWS b/Misc/NEWS
index 58b74bebfc9c55958574b4c409ea500c28d7c708..fb400038cfcff857f6adffe54638cbba9fa7fdc6 100644 (file)
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #21802: The reader in BufferedRWPair now is closed even when closing
+  writer failed in BufferedRWPair.close().
+
 - Issue #23671: string.Template now allows to specify the "self" parameter as
   keyword argument.  string.Formatter now allows to specify the "self" and
   the "format_string" parameters as keyword arguments.

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 02cf038d672d7796e6db8975f19a61e54a24de01..445c8708ad709049082ae0be8dade8e81b22a70c 100644 (file)
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -2365,12 +2365,18 @@ bufferedrwpair_writable(rwpair *self, PyObject *args)
 static PyObject *
 bufferedrwpair_close(rwpair *self, PyObject *args)
 {
+    PyObject *exc = NULL, *val, *tb;
     PyObject *ret = _forward_call(self->writer, &PyId_close, args);
     if (ret == NULL)
-        return NULL;
-    Py_DECREF(ret);
-
-    return _forward_call(self->reader, &PyId_close, args);
+        PyErr_Fetch(&exc, &val, &tb);
+    else
+        Py_DECREF(ret);
+    ret = _forward_call(self->reader, &PyId_close, args);
+    if (exc != NULL) {
+        _PyErr_ChainExceptions(exc, val, tb);
+        Py_CLEAR(ret);
+    }
+    return ret;
 }
 
 static PyObject *