verto_add_signal
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) ||
!verto_add_signal(ctx, VERTO_EV_FLAG_PERSIST, VERTO_SIG_IGN, SIGPIPE))
ev = verto_add_signal(ctx, VERTO_EV_FLAG_PERSIST, do_reset, SIGHUP);
verto_add_signal(verto_ctx *ctx, verto_ev_flag flags,