Function gio_2_0_sys::g_dbus_proxy_call

pub unsafe extern "C" fn g_dbus_proxy_call(
    proxy: *mut GDBusProxy, 
    method_name: *const gchar, 
    parameters: *mut GVariant, 
    flags: GDBusCallFlags, 
    timeout_msec: gint, 
    cancellable: *mut GCancellable, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)