https://github.com/rustdesk/rustdesk/issues/492

src/platform/linux.rs

@@ -642,3 +642,12 @@ fn get_env(name: &str, uid: &str) -> String {
         "".to_owned()
     }
 }
+
+#[link(name = "gtk-3")]
+extern "C" {
+    fn gtk_main_quit();
+}
+
+pub fn quit_gui() {
+    unsafe { gtk_main_quit() };
+}

src/platform/macos.rs

@@ -519,7 +519,7 @@ pub fn is_installed() -> bool {
     false
 }
 
-fn quit_gui() {
+pub fn quit_gui() {
     use cocoa::appkit::NSApp;
     unsafe {
         let () = msg_send!(NSApp(), terminate: nil);

src/platform/windows.rs

@@ -1091,3 +1091,7 @@ oLink.Save
     allow_err!(std::fs::remove_file(shortcut));
     Ok(())
 }
+
+pub fn quit_gui() {
+    unsafe { PostQuitMessage(0) };
+}