From 1e50a9f7cc68aefdf94ad02bc3e62fee2f447208 Mon Sep 17 00:00:00 2001
From: Neal Norwitz <nnorwitz@gmail.com>
Date: Sat, 11 Aug 2007 18:37:05 +0000
Subject: Fix test_wsgiref that used StringIO and a BufferedReader rather than
 real files.  This code assumed that fileno() would succeed which wasn't the
 case.

---
 Lib/io.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/io.py b/Lib/io.py
index b24a21c..2f2d3c5 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -34,6 +34,7 @@ import os
 import sys
 import codecs
 import _fileio
+import io
 import warnings
 
 # XXX Shouldn't we use st_blksize whenever we can?
@@ -973,7 +974,7 @@ class TextIOWrapper(TextIOBase):
         if encoding is None:
             try:
                 encoding = os.device_encoding(buffer.fileno())
-            except AttributeError:
+            except (AttributeError, io.UnsupportedOperation):
                 pass
             if encoding is None:
                 try:
-- 
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