Merge 3.4 (asyncio)

Lib/asyncio/proactor_events.py

@@ -43,12 +43,12 @@ class _ProactorBasePipeTransport(transports._FlowControlMixin,
 
     def __repr__(self):
         info = [self.__class__.__name__]
-        fd = self._sock.fileno()
-        if fd < 0:
+        if self._sock is None:
             info.append('closed')
         elif self._closing:
             info.append('closing')
-        info.append('fd=%s' % fd)
+        if self._sock is not None:
+            info.append('fd=%s' % self._sock.fileno())
         if self._read_fut is not None:
             info.append('read=%s' % self._read_fut)
         if self._write_fut is not None:
@@ -72,6 +72,7 @@ class _ProactorBasePipeTransport(transports._FlowControlMixin,
             self._loop.call_soon(self._call_connection_lost, None)
         if self._read_fut is not None:
             self._read_fut.cancel()
+            self._read_fut = None
 
     def _fatal_error(self, exc, message='Fatal error on pipe transport'):
         if isinstance(exc, (BrokenPipeError, ConnectionResetError)):
@@ -93,9 +94,10 @@ class _ProactorBasePipeTransport(transports._FlowControlMixin,
         self._conn_lost += 1
         if self._write_fut:
             self._write_fut.cancel()
+            self._write_fut = None
         if self._read_fut:
             self._read_fut.cancel()
-        self._write_fut = self._read_fut = None
+            self._read_fut = None
         self._pending_write = 0
         self._buffer = None
         self._loop.call_soon(self._call_connection_lost, exc)