Avoid creating Swoole event loop for SIGINT

Abstracts/TraitServer.php

@@ -142,9 +142,10 @@ trait TraitServer
      */
     private function onPcntlSignal($signal, $callback): void
     {
-        Process::signal((int)$signal, static function (int $signo) use ($callback): void {
+        if (function_exists('pcntl_async_signals')) {
-            call_user_func($callback, $signo, []);
+            pcntl_async_signals(true);
-        });
+        }
+        \pcntl_signal($signal, $callback);
     }