/* Flush all window buffers */
winid_t win;
for(win = glk_window_iterate(NULL, NULL); win != NULL; win = glk_window_iterate(win, NULL)) {
/* Flush all window buffers */
winid_t win;
for(win = glk_window_iterate(NULL, NULL); win != NULL; win = glk_window_iterate(win, NULL)) {