* fhandler.cc (fhandler_base::wait_overlapped): Always assume that bytes will

be non-NULL.  Distinguish input result from result derived from WFMO and
GetOverlappedResult or res can never be -1.  Only raise SIGPIPE when writing.
* fhandler.h (fhandler_base::wait_overlapped): Pass first argument by value.
* fhandler_fifo.cc (fhandler_fifo::wait): Pass in dummy byte count to
wait_overlapped.
* pipe.cc (DEFAULT_PIPEBUFSIZE): Define to 65536 explicitly.

winsup/cygwin/fhandler_fifo.cc

@@ -132,9 +132,10 @@ fhandler_fifo::wait (bool iswrite)
     {
     case fifo_wait_for_client:
       bool res = ConnectNamedPipe (get_handle (), get_overlapped ());
+      DWORD dummy_bytes;
       if (res || GetLastError () == ERROR_PIPE_CONNECTED)
 	return true;
-      return wait_overlapped (res, iswrite, NULL);
+      return wait_overlapped (res, iswrite, &dummy_bytes);
     default:
       break;
     }