added function for notifying about exit

src/main.c

@@ -1,13 +1,23 @@
+#include <stdlib.h>
 #include <sys/log.h>
 #include <yacc/parser.tab.h>
 
 #define LOG_LEVEL LOG_LEVEL_DEBUG
 
+void notify_exit(void)
+{
+    DEBUG("Exiting gemstone...");
+}
+
 void setup(void)
 {
     log_init();
     DEBUG("starting gemstone...");
 
+    #if LOG_LEVEL <= LOG_LEVEL_DEBUG
+    atexit(&notify_exit);
+    #endif
+
     DEBUG("finished starting up gemstone...");
 }