on a missing resolv.conf file and initializes the
                        structure as if it had been configured with:

                                nameserver ::1
                                nameserver 127.0.0.1

                        Note: Callers will need to be updated to treat
                        ISC_R_FILENOTFOUND as a qualified success or else
                        they will leak memory. The following code fragment
                        will work with both only and new versions without
                        changing the behaviour of the existing code.

                        resconf = NULL;
                        result = irs_resconf_load(mctx, "/etc/resolv.conf",
                                                  &resconf);
                        if (result != ISC_SUCCESS) {
                                if (resconf != NULL)
                                        irs_resconf_destroy(&resconf);
                                ....
                        }

                        [RT #35194]