【玩转开源】Linux C 检测网口热插拔

int NetDetect(char *net_name, int *statue)
{
    int ret = 0;
    int skfd = 0;
    struct ifreq ifr;
    skfd = socket(AF_INET, SOCK_DGRAM, 0);   //建议socket通信，AF_INET协议族，SOCK_DGRAM表示UDP协议，0表示使用默认套接字，即这里的UDP
    if(skfd < 0){
        printf("open socket error\n");
        return skfd;
    }
    strcpy(ifr.ifr_name, net_name);    //要检测网卡的名称
    if((ret = ioctl(skfd, SIOCGIFFLAGS, &ifr)) < 0){      //调用内核接口，获取网卡信息
        printf("ethernet interface is not valid\n");
        close(skfd);
        return ret;
    }
    close(skfd);
    if(ifr.ifr_flags & IFF_RUNNING){   //判断网卡状态
        *statue = 1;
    }else{
        *statue = 0;
    } 
    return ret;
}