server: Add a more general way of posting messages to the desktop window.

server/user.h

@@ -143,7 +143,8 @@ extern int rect_in_region( struct region *region, const rectangle_t *rect );
 
 extern struct process *get_top_window_owner( struct desktop *desktop );
 extern void get_top_window_rectangle( struct desktop *desktop, rectangle_t *rect );
-extern void close_desktop_window( struct desktop *desktop );
+extern void post_desktop_message( struct desktop *desktop, unsigned int message,
+                                  lparam_t wparam, lparam_t lparam );
 extern void destroy_window( struct window *win );
 extern void destroy_thread_windows( struct thread *thread );
 extern int is_child_window( user_handle_t parent, user_handle_t child );

server/window.c

@@ -402,11 +402,12 @@ void get_top_window_rectangle( struct desktop *desktop, rectangle_t *rect )
     else *rect = win->window_rect;
 }
 
-/* attempt to close the desktop window when the last process using it is gone */
-void close_desktop_window( struct desktop *desktop )
+/* post a message to the desktop window */
+void post_desktop_message( struct desktop *desktop, unsigned int message,
+                           lparam_t wparam, lparam_t lparam )
 {
     struct window *win = desktop->top_window;
-    if (win && win->thread) post_message( win->handle, WM_CLOSE, 0, 0 );
+    if (win && win->thread) post_message( win->handle, message, wparam, lparam );
 }
 
 /* create a new window structure (note: the window is not linked in the window tree) */

server/winstation.c

@@ -376,7 +376,7 @@ static void close_desktop_timeout( void *private )
 
     desktop->close_timeout = NULL;
     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
-    close_desktop_window( desktop );  /* and signal the owner to quit */
+    post_desktop_message( desktop, WM_CLOSE, 0, 0 );  /* and signal the owner to quit */
 }
 
 /* close the desktop of a given process */