--- psshlib/manager.py.orig	2012-02-02 17:13:09.000000000 +0100
+++ psshlib/manager.py	2016-01-17 11:52:13.764088460 +0100
@@ -4,0 +5 @@
+import fcntl
@@ -211,0 +213 @@
+        fcntl.fcntl(wakeup_writefd, fcntl.F_SETFL, os.O_NONBLOCK)