if (!(vls = vls_get_w_dlock (vlsh)))
return VPPCOM_EBADFD;
rv = vppcom_session_attr (vls_to_sh_tu (vls), op, buffer, buflen);
if (!(vls = vls_get_w_dlock (vlsh)))
return VPPCOM_EBADFD;
rv = vppcom_session_attr (vls_to_sh_tu (vls), op, buffer, buflen);