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;
}