__constant_htonl
.in6_u.u6_addr32 = {__constant_htonl(0xffffffff),
__constant_htonl(0xffffffff),
__constant_htonl(0xffffffff),
__constant_htonl(0xffffffff)},
.sin_addr.s_addr = __constant_htonl(addr4), \
seq_num = __constant_htonl(words_to_end);
const struct in_addr addr4 = { .s_addr = __constant_htonl(INADDR_LOOPBACK + 2) };
__constant_htonl(0xac100001),
__constant_htonl(0xac100002),
__constant_htonl(0xac100101),
__constant_htonl(0xac100102),
__constant_htonl(0x0a000001), /* 10.0.0.1 */