changed error handling

main.c

@@ -19,6 +19,8 @@ void signal_handler_sigint(const int _signal) {
 }
 
 int main(void) {
+    int ret = 0;
+
     // register the SIGINT handler
     signal(SIGINT, signal_handler_sigint);
 
@@ -46,14 +48,16 @@ int main(void) {
         const ssize_t read = getline(&line_buffer, &line_len, stat_file);
         if (read == -1) {
             printf("Failed to read the stat file!\n");
-            exit(1);
+            ret = 1;
+            goto exit_label;
         }
 
         uint64_t user, user_nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice;
         const int n_read = sscanf(line_buffer, "cpu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu", &user, &user_nice, &system, &idle, &iowait, &irq, &softirq, &steal, &guest, &guest_nice); // NOLINT(*-err34-c)
         if (n_read != 10) {
             printf("Failed to read the stat file: Invalid format?\n");
-            exit(1);
+            ret = 1;
+            goto exit_label;
         }
 
         const uint64_t current_total_jiffies_active = user + user_nice + system + irq + softirq + guest + guest_nice;
@@ -73,8 +77,9 @@ int main(void) {
         fflush(out_file);
     }
 
+exit_label:
     free(line_buffer);
 
     printf("Terminating...\n");
-    return 0;
+    return ret;
 }