diff --git a/qse/include/qse/si/App.hpp b/qse/include/qse/si/App.hpp
index 4032c2bd..c6ffc14d 100644
--- a/qse/include/qse/si/App.hpp
+++ b/qse/include/qse/si/App.hpp
@@ -97,6 +97,11 @@ public:
 	static int setSignalHandler (int sig, SignalHandler sighr);
 	static int unsetSignalHandler (int sig, bool ignore = false);
 
+	bool isGuardian () const
+	{
+		return this->_guarded_child_pid >= 0;
+	}
+
 	int guardProcess (const SignalSet& signals, const qse_mchar_t* proc_name = QSE_NULL);
 
 private:
diff --git a/qse/lib/si/TcpServer.cpp b/qse/lib/si/TcpServer.cpp
index 332a3699..634870d2 100644
--- a/qse/lib/si/TcpServer.cpp
+++ b/qse/lib/si/TcpServer.cpp
@@ -33,6 +33,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 
+
 #define WID_MAP_ALIGN 128
 #define WID_MAX (wid_map_t::WID_INVALID - 1)
 
@@ -397,7 +398,7 @@ int TcpServer::start (const qse_char_t* addrs) QSE_CPP_NOEXCEPT
 
 			mux_xtn->first_time = true;
 
-			n = qse_mux_poll (this->listener_list.mux, QSE_NULL);
+			n = qse_mux_poll(this->listener_list.mux, QSE_NULL);
 			if (n <= -1)
 			{
 				this->setErrorCode (E_ESYSERR); // TODO: proper error code conversion