From 2a3f38fd299c09be89a7872ccd15c4aedd5fc145 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 26 Jan 2015 15:03:44 +0100
Subject: [PATCH] asyncio: PipeHandle.fileno() now raises an exception if the
 pipe is closed

---
 Lib/asyncio/windows_utils.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Lib/asyncio/windows_utils.py b/Lib/asyncio/windows_utils.py
index e6642960db3..5f8327eba63 100644
--- a/Lib/asyncio/windows_utils.py
+++ b/Lib/asyncio/windows_utils.py
@@ -147,6 +147,8 @@ class PipeHandle:
         return self._handle
 
     def fileno(self):
+        if self._handle is None:
+            raise ValueError("I/O operatioon on closed pipe")
         return self._handle
 
     def close(self, *, CloseHandle=_winapi.CloseHandle):