XS(XS_main_xxxxx) {
    dXSARGS;

    if (items != 1) croak_xs_usage(cv,  "n");

    SP -= items;
    {
        int	n = (int)SvIV(ST(0));
        I32* temp = PL_markstack_ptr++;
    
        PUTBACK;
        xxxxx(n);

        if (PL_markstack_ptr != temp) {
             PL_markstack_ptr = temp;
             XSRETURN_EMPTY; 
        }
        PUTBACK;
        return;
    }
}