获取主机的ip

int get_ip_num()
{
    struct hostent * Host;
    char hostname[512];
    int ip_num = 0;
    if (gethostname(hostname, 512) != 0)
    {
        return -1;
    }
    Host = gethostbyname(hostname);

    if (Host == NULL)
    {
        return -1;
    }
    if (Host->h_addrtype == AF_INET)
    {
        int i = 0;
        struct in_addr addr;

        while (Host->h_addr_list[i] != 0)
        {
            i++;
            ip_num++;
        }
    }

    return ip_num;
}