fds_arp 519 samples/bpf/xdp_router_ipv4_user.c struct pollfd fds_route, fds_arp; fds_arp 562 samples/bpf/xdp_router_ipv4_user.c fds_arp.fd = sock_arp; fds_arp 563 samples/bpf/xdp_router_ipv4_user.c fds_arp.events = POLL_IN; fds_arp 598 samples/bpf/xdp_router_ipv4_user.c if (poll(&fds_arp, 1, 3) == POLL_IN) {