From b4b245131f5b7a7fad1fc1fca37ca45fa9e2e087 Mon Sep 17 00:00:00 2001
From: Thomas Kluyver <thomas@kluyver.me.uk>
Date: Wed, 7 Dec 2016 11:14:05 +0100
Subject: [PATCH] Use errno_from_exception on error caught in Waker

Addresses part of gh-1907
---
 tornado/platform/common.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tornado/platform/common.py b/tornado/platform/common.py
index 2d4065ca63..d78ee6866b 100644
--- a/tornado/platform/common.py
+++ b/tornado/platform/common.py
@@ -6,7 +6,7 @@
 import time
 
 from tornado.platform import interface
-
+from tornado.util import errno_from_exception
 
 def try_close(f):
     # Avoid issue #875 (race condition when using the file in another
@@ -61,7 +61,7 @@ def __init__(self):
                 break    # success
             except socket.error as detail:
                 if (not hasattr(errno, 'WSAEADDRINUSE') or
-                        detail[0] != errno.WSAEADDRINUSE):
+                        errno_from_exception(detail) != errno.WSAEADDRINUSE):
                     # "Address already in use" is the only error
                     # I've seen on two WinXP Pro SP2 boxes, under
                     # Pythons 2.3.5 and 2.4.1.