Add os_release, date and creator variables.

include/shared_mem_buffer.h

@@ -321,6 +321,10 @@ struct SharedMem
         std::atomic_bool m_finished{false};
     } m_downLoadDC;
 
+    // meta-data
+    char os_release[64];
+    char date_of_creation[32];
+    char creator[128]; // name of application plus pid
 
     static QSharedMemory *getShm(std::size_t s = 0);