On Mon, 30 Sep 2019 11:59:02 +0200 Jiri Pirko <[email protected]> wrote:
> + open_json_array(PRINT_JSON, "altnames");
> + for (i = RTA_DATA(proplist); RTA_OK(i, rem);
> + i = RTA_NEXT(i, rem)) {
> + if (i->rta_type != IFLA_ALT_IFNAME)
> + continue;
> + print_string(PRINT_FP, "NULL", "%s altname ", _SL_);
You can pass real NULL versus quoted NULL when doing print to file only
