在程序中如何检测网线的插拔事件？网上搜了下，发现大都用类似下面的代码处理
int sockfd;
int i,len;
char buf[4096];
struct iovec iov;
struct msghdr msg;
struct sockaddr_nl sa;
memset(&sa,0,sizeof(sa));
sa.nl_family=AF_NETLINK;
sa.nl_groups=NETLINK_KOBJECT_UEVENT;
sa.nl_pid = 0;
memset(&msg,0,sizeof(msg));
iov.iov_base=(void *)buf;
iov.iov_len=sizeof(buf);
msg.msg_name=(void *)&sa;
msg.msg_namelen=sizeof(sa);
msg.msg_iov=&iov;
msg.msg_iovlen=1;
sockfd=socket(AF_NETLINK,SOCK_RAW,NETLINK_KOBJECT_UEVENT);
if(sockfd==-1)
printf("socket creating failed:%s\n",strerror(errno));
if(bind(sockfd,(struct sockaddr *)&sa,sizeof(sa))==-1)
printf("bind error:%s\n",strerror(errno));
len=recvmsg(sockfd,&msg,0);
if(len<0)
printf("receive error\n");
else if(len<32||len>sizeof(buf))
printf("invalid message");
for(i=0;i<len;i++)
if(*(buf+i)=='\0')
buf[i]='\n';
printf("received %d bytes\n%s\n",len,buf);
但我试过，在widora平台上还是无法检测到网线的插拔
请问还有其它方法么？