- Proper process termination:

if interrupted with CTRL+C blocking socket calls will return with -1. Each device should call FairMQDevice::Shutdown() before ending the running state to close open sockets, otherwise the interrupt call itself will block.

- FIX: Update number of received messages for FairMQFileSink.
- Add ability to poll on outputs for FairMQPoller.

fairmq/nanomsg/FairMQMessageNN.cxx

@@ -13,6 +13,7 @@
  */
 
 #include <cstring>
+#include <stdlib.h>
 
 #include <nanomsg/nn.h>