plugins: RealtimeLogger plugin

Logs access to a given global variable of the SUT, given by
a symbol name, and outputs value when variable is written to file.
Format:
<Simulation time>;<Value of variable>

Change-Id: I81b581e571be4255a1a2200c41e7c16657ddfd3d

src/plugins/realtimelogger/RealtimeLogger.hpp

@@ -0,0 +1,50 @@
+#ifndef __REALTIMELOGGER_HPP__
+  #define __REALTIMELOGGER_HPP__
+
+#include <string>
+#include <unistd.h>
+#include "efw/ExperimentFlow.hpp"
+#include "config/FailConfig.hpp"
+#include "util/Logger.hpp"
+#include <fstream>
+#include "util/ElfReader.hpp"
+
+/**
+ * @class RealtimeLogger
+ * @brief Listens to a memory location and outputs content on write access 
+ * from SUT to file
+ */
+class RealtimeLogger : public fail::ExperimentFlow
+{
+
+private:
+    const fail::ElfSymbol m_symbol; //!< the target's memory symbol the plugin is listening on
+    std::string m_outputfile; //!< the output filename
+    fail::Logger m_log; //!< debug output
+    std::ofstream m_ostream; //!< Outputfile stream
+
+public:
+    /**
+     * Constructor of RealtimeLogger.
+     *
+     * @param symbol The global memory address the plugin listens to
+     * @param outputfile The path to the file to write the output to
+     */
+    RealtimeLogger( const fail::ElfSymbol & symbol, const std::string& outputfile ) :  m_symbol(symbol), m_outputfile(outputfile) , m_log("RTLogger", false) {
+      m_ostream.open(m_outputfile.c_str() );
+      if(!m_ostream.is_open()){
+        m_log << "Could not open " << m_outputfile.c_str() << " for writing." << std::endl;
+      }
+    }
+
+    bool run();
+
+private:
+    /**
+     * Handle the memory event
+     */
+    void handleEvent(fail::simtime_t simtime, uint32_t value);
+
+};
+
+#endif // __REALTIMELOGGER_HPP__