int get_ipconfig(uint *ipaddr, uint *netmask) 이 함수의 unit 는 뭘 말하는건가요?;;

int get_ipconfig(uint *ipaddr, uint *netmask)
{
    int i, sock, ret;
    struct ifreq ifr;
 
    sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (sock < 0) {
        printf("socket() error\n");
        return -1;
    }
 
    strcpy(ifr.ifr_name, "eth0");
 
    // Get IP Adress
    ret = ioctl(sock, SIOCGIFADDR, &ifr);
    if (ret < 0) {
        printf("get_ipconfig(), ioctl() error\n");
        close(sock);
        return -1;
    }
    *ipaddr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
 
    // Get Netmask
    ret = ioctl(sock, SIOCGIFNETMASK, &ifr);
    if (ret < 0) {
        printf("get_ipconfig(), ioctl() error\n");
        close(sock);
        return -1;
    }
    *netmask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
 
    close(sock);
}