ilb_walk_hc
rclib = ilb_walk_hc(h, ilbadm_print_hc, ofmt_h);
rclib = ilb_walk_hc(h, ilbadm_export_hcinfo, (void *)&arg);
rc = ilb_walk_hc(h, i_drop_hc, NULL);
ilb_status_t ilb_walk_hc(ilb_handle_t, hc_walkerfunc_t, void *);