Handle sigterm so application reacts to docker stopping

src/server.c

@@ -158,6 +158,13 @@ void show_usage(char *program_name, char *error) {
     exit(1);
 }
 
+// SIGTERM handler.
+static volatile sig_atomic_t got_term = 0;
+void on_term(int sig) {
+    (void)sig;
+    got_term = 1;
+}
+
 int main(int argc, char **argv)
 {
     // Parse input parameters.
@@ -197,7 +204,10 @@ int main(int argc, char **argv)
 
     noh_log(NOH_INFO, "Server is running on http://0.0.0.0:%d", port);
 
-    // Keep the server running
+    // Keep the server running, but handle SIGTERM.
+    struct sigaction sa = {0};
+    sa.sa_handler = on_term;
+    sigaction(SIGTERM, &sa, NULL);
     getchar();
 
     noh_log(NOH_INFO, "Shutting down.", port);