chatgui: add shutdown diagnostics (poll exit reason, cleanup steps, app.exec return)

tools/chatgui/src/main.cpp

@@ -95,5 +95,7 @@ int main(int argc, char *argv[]) {
     SetConsoleCtrlHandler(console_ctrl_handler, TRUE);
 #endif
 
-    return app.exec();
+    int ret = app.exec();
+    qDebug("main: app.exec() returned %d", ret);
+    return ret;
 }

tools/chatgui/src/mainwindow.cpp

@@ -88,6 +88,7 @@ MainWindow::~MainWindow() {
     if (m_messageList) m_messageList->saveChannelState();
     DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — stopping utun node");
     if (m_node) { m_node->stop(); delete m_node; m_node = nullptr; }
+    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow — node stop+delete done");
     DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "MainWindow: ~MainWindow done");
 }
 

tools/chatgui/transport/utun_node.cpp

@@ -344,16 +344,23 @@ void UtunNode::runLoop() {
         uasync_poll(ua, 100);
     }
 
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: poll exit m_stop=%d g_shutdown=%d", (int)m_stop, (int)g_shutdown);
+
     signal(SIGINT, SIG_DFL);
     signal(SIGTERM, SIG_DFL);
     g_signal_ua = nullptr;
 
     etcp_router_bind(m_instance, ETCP_RT_ID_CHAT, nullptr);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: etcp_router_unbind done");
     chat_sync_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: chat_sync_destroy done");
     chat_core_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: chat_core_destroy done");
     utun_instance_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: utun_instance_destroy done");
     m_instance = nullptr;
     uasync_destroy(ua, 0);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: uasync_destroy done, emitting stopped");
     g_currentNode = nullptr;
     QMetaObject::invokeMethod(this, [this] { emit stopped(); });
 }