su_len
data_dest.su_len = sizeof(struct sockaddr_in);
data_dest.su_len = sizeof(struct sockaddr_in6);
if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
data_source.su_len) >= 0)
socklen_t fromlen = ctrl_addr.su_len;
data_source.su_len,
data_dest.su_len) == 0)
if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
len = pasv_addr.su_len;