diff --git a/daemon/ExternalSource.h b/daemon/ExternalSource.h
--- /dev/null
+++ b/daemon/ExternalSource.h
@@ -0,0 +1,40 @@
+/**
+ * Copyright (C) ARM Limited 2010-2014. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef EXTERNALSOURCE_H
+#define EXTERNALSOURCE_H
+
+#include <semaphore.h>
+
+#include "Buffer.h"
+#include "OlySocket.h"
+#include "Source.h"
+
+// Unix domain socket counters from external sources like graphics drivers
+class ExternalSource : public Source {
+public:
+ ExternalSource(sem_t *senderSem);
+ ~ExternalSource();
+
+ bool prepare();
+ void run();
+ void interrupt();
+
+ bool isDone();
+ void write(Sender *sender);
+
+private:
+ Buffer mBuffer;
+ OlySocket mSock;
+
+ // Intentionally unimplemented
+ ExternalSource(const ExternalSource &);
+ ExternalSource &operator=(const ExternalSource &);
+};
+
+#endif // EXTERNALSOURCE_H