+ /**
+ * Checks if the worker is running in the daemon mode.
+ *
+ * @return boolean
+ */
+ public static function isDaemonMode()
+ {
+ if (!is_null(self::$daemon_mode)) {
+ return self::$daemon_mode;
+ }
+
+ if (DI::mode()->getExecutor() == Mode::DAEMON) {
+ return true;
+ }
+
+ $daemon_mode = DI::config()->get('system', 'worker_daemon_mode', false, true);
+ if ($daemon_mode) {
+ return $daemon_mode;
+ }
+
+ if (!function_exists('pcntl_fork')) {
+ self::$daemon_mode = false;
+ return false;
+ }
+
+ $pidfile = DI::config()->get('system', 'pidfile');
+ if (empty($pidfile)) {
+ // No pid file, no daemon
+ self::$daemon_mode = false;
+ return false;
+ }
+
+ if (!is_readable($pidfile)) {
+ // No pid file. We assume that the daemon had been intentionally stopped.
+ self::$daemon_mode = false;
+ return false;
+ }
+
+ $pid = intval(file_get_contents($pidfile));
+ $running = posix_kill($pid, 0);
+
+ self::$daemon_mode = $running;
+ return $running;
+ }
+