force termination (SIGINT,SIGTERM) after 1s

Author: NikolasK-source

src/main.cpp

@@ -17,7 +17,7 @@ static volatile bool terminate = false;
  */
 static void sig_term_handler(int) {
     terminate = true;
-    alarm(1);
+    alarm(1);  // force termination after 1 second
 }
 
 /*! \brief main function
@@ -41,6 +41,11 @@ int main(int argc, char **argv) {
         exit(EX_OSERR);
     }
 
+    if (signal(SIGALRM, [](int) { exit(EX_OK); })) {
+        perror("Failed to establish signal handler");
+        exit(EX_OSERR);
+    }
+
     // all command line arguments
     options.add_options()("d,device", "mandatory: serial device", cxxopts::value<std::string>());
     options.add_options()("i,id", "mandatory: modbus RTU slave id", cxxopts::value<int>());