NETMAP_REQ_IFNAMSIZ
char name[NETMAP_REQ_IFNAMSIZ]; /* used at least by pipes */
char nr_name[NETMAP_REQ_IFNAMSIZ]; /* port name */
strncpy(hdr.nr_name, a->name, NETMAP_REQ_IFNAMSIZ - 1);
hdr.nr_name[NETMAP_REQ_IFNAMSIZ - 1] = '\0';