add some return values to some shit so it shuts down elegantly on crash

include/app.hpp

@@ -34,7 +34,7 @@ class Application {
 
     explicit Application(Config config);
     ~Application();
-    void Run();
+    int Run();
 
    private:
     struct Sensors {
@@ -55,6 +55,8 @@ class Application {
         sigset_t sigset;
     };
 
+    pid_t m_mainPid{};
+    int m_ret = 0;
     Config m_config{};  // m_ is prefix for member variable
     Control m_control{};
     Sensors m_sensors{};
@@ -62,6 +64,8 @@ class Application {
     void hassThread(const std::stop_token& st);
     void sensorsThread(const std::stop_token& st);
     void displayThread(const std::stop_token& st);
+
+    void Crash(int ret);
 };
 
 #endif