银河麒麟(linux loongarch64) gethostname 获取不到IP地址

开发环境：

版本：银河麒麟桌面操作系统V10（SP1）
内核：Linux 5.4.18-28.23-bj-generic
CPU：Loongson-3A5000

终端输入 uname -m 查看
架构： loongarch64

下面获取IP地址的gethostname方法在windows 上是可以获取的
在银河麒麟(linux)  gethostname 获取不到IP地址，只能获取到回环地址 127.0.1.1

std::vector WHUDP::getIpList()
{
    std::vector result;
    char name[256]={'\0'};

    int getNameRet=::gethostname(name,sizeof(name));

    hostent *host=::gethostbyname(name);

    if(NULL == host){
        return result;
    }

    in_addr *pAddr=(in_addr*)*host->h_addr_list;

    //返回指定主机名的包含主机名字和地址信息的hostent结构的指针
    /*struct hostent
        {
        char *h_name; //正式主机名
        char ** h_aliases; //主机别名
        short h_addrtype; //主机IP地址类型：IPV4-AF_INET
        short h_length; //主机I票地址字节长度，IPV4是4字节，即32位
        char ** h_addr_list; //主机的IP地址列表
        };*/

    for(int i=0; pAddr&&host->h_addr_list[i]!=NULL;i++){
        string addr=inet_ntoa(pAddr[i]);
        cout<

查找使用下面的可以获取：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

std::vector WHUDP::getIpList() {
    std::vector result;
    int s;
    struct ifconf conf;
    struct ifreq *ifr;
    char buff[BUFSIZ];
    int num;
    int i;

    s = socket(PF_INET, SOCK_DGRAM, 0);
    conf.ifc_len = BUFSIZ;
    conf.ifc_buf = buff;

    ioctl(s, SIOCGIFCONF, &conf);
    num = conf.ifc_len / sizeof(struct ifreq);
    ifr = conf.ifc_req;

    for(i=0;i < num;i++)
    {
        struct sockaddr_in *sin = (struct sockaddr_in *)(&ifr->ifr_addr);

        ioctl(s, SIOCGIFFLAGS, ifr);
        if(((ifr->ifr_flags & IFF_LOOPBACK) == 0) && (ifr->ifr_flags & IFF_UP))
        {
            printf("%s (%s)/n",
                   ifr->ifr_name,
                   inet_ntoa(sin->sin_addr));

            string addr=inet_ntoa(sin->sin_addr);
            result.push_back(addr);
        }
        ifr++;
    }
    return result;
}

另一种写法：

static int getIfaceName(char *iface_name, int len)
{
    int r = -1;
    int flgs, ref, use, metric, mtu, win, ir;
    unsigned long int d, g, m;
    char devname[20];
    FILE *fp = NULL;

    if((fp = fopen("/proc/net/route", "r")) == NULL) {
        perror("fopen error!\n");
        return -1;
    }

    if (fscanf(fp, "%*[^\n]\n") < 0) {
        fclose(fp);
        return -1;
    }

    while (1) {
        r = fscanf(fp, "%19s%lx%lx%X%d%d%d%lx%d%d%d\n",
                 devname, &d, &g, &flgs, &ref, &use,
                 &metric, &m, &mtu, &win, &ir);
        if (r != 11) {
            if ((r < 0) && feof(fp)) {
                break;
            }
            continue;
        }

        strncpy(iface_name, devname, len);
        fclose(fp);
        return 0;
    }

    fclose(fp);

    return -1;
}

static int getIpAddress(char *iface_name, char *ip_addr, int len)
{
    int sockfd = -1;
    struct ifreq ifr;
    struct sockaddr_in *addr = NULL;

    memset(&ifr, 0, sizeof(struct ifreq));
    strcpy(ifr.ifr_name, iface_name);
    addr = (struct sockaddr_in *)&ifr.ifr_addr;
    addr->sin_family = AF_INET;

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("create socket error!\n");
        return -1;
    }

    if (ioctl(sockfd, SIOCGIFADDR, &ifr) == 0) {
        strncpy(ip_addr, inet_ntoa(addr->sin_addr), len);
        close(sockfd);
        return 0;
    }

    close(sockfd);

    return -1;
}


//调用
void getIP() {
    struct in_addr    intaddr;
        char iface_name[20];

        if(getIfaceName(iface_name, sizeof(iface_name)) < 0) {
            printf("get interface name error!\n");
        }

        if(getIpAddress(iface_name, (char *) &intaddr, 15) < 0) {
            printf("get interface ip address error!\n");
        }

        printf("address:%s\n",(char *) &intaddr);
}

参考：

https://blog.csdn.net/dawnstar_hoo/article/details/4042840

http://blog.chinaunix.net/uid-25885064-id-3457067.html?/14600.html