#10053: Don't close FDs when FileIO.__init__ fails

Loosely based on the work by Hirokazu Yamamoto.

Lib/test/test_fileio.py

@@ -421,6 +421,17 @@ class OtherFileTests(unittest.TestCase):
             'IOError: [Errno 2] No such file or directory' not in out):
             self.fail('Bad output: %r' % out)
 
+    def testUnclosedFDOnException(self):
+        class MyException(Exception): pass
+        class MyFileIO(_FileIO):
+            def __setattr__(self, name, value):
+                if name == "name":
+                    raise MyException("blocked setting name")
+                return super(MyFileIO, self).__setattr__(name, value)
+        fd = os.open(__file__, os.O_RDONLY)
+        self.assertRaises(MyException, MyFileIO, fd)
+        os.close(fd)  # should not raise OSError(EBADF)
+
 def test_main():
     # Historically, these tests have been sloppy about removing TESTFN.
     # So get rid of it no matter what.