asyncio: PipeHandle.fileno() now raises an exception if the pipe is closed

diff --git a/Lib/asyncio/windows_utils.py b/Lib/asyncio/windows_utils.py
index e6642960db37cea99f01fcfda35baccb55c6921d..5f8327eba63aa3827fc3398e26500121f1e76729 100644 (file)
--- 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):