localhost和127.0.0.1的区别

bzero(&servaddr,sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    //inet_pton(AF_INET,ip,&servaddr.sin_addr);
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//绑定所有网卡所有IP
    //servaddr.sin_addr.s_addr = inet_addr("172.16.6.178");
    //servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");//这样写指代不明，当服务器有多网卡时，不知道绑定哪个IP，导致连接失败
    servaddr.sin_port = htons(port);
    if (bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) == -1)
    {
        perror("bind error: ");
        exit(1);
    }

void Init(const char* ip, uint16_t hostport) {
        std::string sip = ConvertIp(ip);
        addr_.sin_family = AF_INET;
        addr_.sin_addr.s_addr = ::inet_addr(sip.data());
        addr_.sin_port = htons(hostport);
    }
std::string ConvertIp(const char* ip) {
    if (strncmp(ip, "loopback", 8) == 0)
        return "127.0.0.1";
    if (strncmp(ip, "localhost", 9) == 0) {
        ananas::SocketAddr tmp;
        tmp.Init(ananas::GetLocalAddrInfo(), 0);
        return tmp.GetIP();
    }
    return ip;
}