Linux下获取本机IP地址的代码

#define ETH_NAME  "eth0"

//获得本机IP地址
char* GetLocalAddress()
{
        int sock;
        struct sockaddr_in sin;
        struct ifreq ifr;
       
        sock = socket(AF_INET, SOCK_DGRAM, 0);
        if (sock == -1)
        {
                perror("socket");
                return NULL;               
        }
       
        strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);
        ifr.ifr_name[IFNAMSIZ - 1] = 0;
       
        if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)
        {
                perror("ioctl");
                return NULL;
        }

        memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
    return inet_ntoa(sin.sin_addr);
}