Signal handlers to deploy as an init.d service. Makefile install routine

RestServer/main.c

@@ -6,6 +6,7 @@
 #include <arpa/inet.h>
 
 #include <signal.h>
+#include <unistd.h>
 
 #include "sendmysql.h"
 #include "calculate.h"
@@ -25,9 +26,13 @@ void exitFunction(void) {
     printf("Exiting HumidityServer.\n");
     ulfius_stop_framework(&instance);
     ulfius_clean_instance(&instance);
-    exit(0);
 }
 
+void sig_handler(int signo) {
+    if (signo == SIGINT || signo == SIGTERM || signo == SIGKILL) {
+        exit(0); //executes the exitFunction
+    }
+}
 
 int callback_welcome (const struct _u_request * request, struct _u_response * response, void * user_data) {
     ulfius_set_string_body_response(response, 200, "Welcome to the HumidityPi rest service!");
@@ -114,6 +119,17 @@ int callback_absTempHum(const struct _u_request *request, struct _u_response *re
 int main(void) {
     
     atexit(exitFunction);
+    
+    if (signal(SIGINT, sig_handler) == SIG_ERR) {
+         printf("\ncan't catch SIGINT\n");
+    }
+    if (signal(SIGTERM, sig_handler) == SIG_ERR) {
+         printf("\ncan't catch SIGTERM\n");
+    }
+    if (signal(SIGKILL, sig_handler) == SIG_ERR) {
+         printf("\ncan't catch SIGTERM\n");
+    }
+    
     // Initialize instance with the port number
     if (ulfius_init_instance(&instance, PORT, NULL, NULL) != U_OK) {
         fprintf(stderr, "Error ulfius_init_instance, abort\n");
@@ -128,8 +144,8 @@ int main(void) {
     if (ulfius_start_framework(&instance) == U_OK) {
         printf("Start framework on port %d\n", instance.port);
         
-        // Wait for the user to press <enter> on the console to quit the application
-        getchar();
+        // Wait for a signal to stop the program.
+        pause();
     } else {
         fprintf(stderr, "Error starting framework\n");
     }