xsetsockopt
err = xsetsockopt(s, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
err = xsetsockopt(s, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &progfd,
err = xsetsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
xsetsockopt(fd, SOL_SOCKET, SO_TIMESTAMPNS_NEW, &on, sizeof(on));
xsetsockopt(fd, IPPROTO_TCP, TCP_INQ, &on, sizeof(on));