aggr_port_fields_buf_t
aggr_port_fields_buf_t *buf;
buf = malloc(sizeof (aggr_port_fields_buf_t));
offsetof(aggr_port_fields_buf_t, ap_linkname), print_default_cb},
offsetof(aggr_port_fields_buf_t, ap_portname), print_default_cb},
offsetof(aggr_port_fields_buf_t, ap_ipackets), print_default_cb},
offsetof(aggr_port_fields_buf_t, ap_rbytes), print_default_cb},
offsetof(aggr_port_fields_buf_t, ap_opackets), print_default_cb},
offsetof(aggr_port_fields_buf_t, ap_obytes), print_default_cb},