do_break
if (!verto_add_signal(ctx, VERTO_EV_FLAG_PERSIST, do_break, SIGINT) ||
!verto_add_signal(ctx, VERTO_EV_FLAG_PERSIST, do_break, SIGTERM) ||
!verto_add_signal(ctx, VERTO_EV_FLAG_PERSIST, do_break, SIGQUIT) ||