smart_cksum
int smart_cksum(u_int8_t *, size_t);
if (smart_cksum((u_int8_t *)&data, sizeof(data)) != 0)
if (smart_cksum(inbuf, sizeof(inbuf)) != 0)
if (smart_cksum(inbuf, sizeof(inbuf)) != 0)
if (smart_cksum(inbuf, sizeof(inbuf)) != 0)
if (smart_cksum((u_int8_t *)&attr_val, sizeof(attr_val)) != 0)
if (smart_cksum((u_int8_t *)&attr_thr, sizeof(attr_thr)) != 0)