static void close_accept_socket(void)
{
    BIO_printf(bio_err, "shutdown accept socket\n");
    if (accept_socket >= 0) {
        SHUTDOWN2(accept_socket);
    }
}
static void close_accept_socket(void)
{
    BIO_printf(bio_err, "shutdown accept socket\n");
    if (accept_socket >= 0) {
        SHUTDOWN2(accept_socket);
    }
}