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int getmac(char *pmac)
{
  char *device="eth0";
  unsigned char macaddr[ETH_ALEN+1];
  struct ifreq req;
  int err;
  int i;
  int s=socket(AF_INET,SOCK_DGRAM,0);

  strcpy(req.ifr_name,device);
  err=ioctl(s,SIOCGIFHWADDR,&req);
  if(err!= -1){
    memcpy(macaddr,req.ifr_hwaddr.sa_data,ETH_ALEN);

    for(i=0; i <ETH_ALEN; i++){
      *pmac = macaddr[i];
      pmac++;
    }
    printf("\n");
    return  ETH_ALEN ;
  }
  close(s);
}

Ϊʲô²»°ÑÍø¿¨×÷Ϊ²ÎÊýÊäÈëÄØ£¿char *eth£¬ÁíÍâÕâÀィÒéÕâÑùд
    for(i=0; i <ETH_ALEN; i++){
      *pmac = macaddr[i];
      pmac++;
    }

¸ÄΪ    for(i=0; i <ETH_ALEN; i++){
      *(pmac+i) = macaddr[i];
    }


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Ϊʲô²»°ÑÍø¿¨×÷Ϊ²ÎÊýÊäÈëÄØ£¿char *eth£¬ÁíÍâÕâÀィÒéÕâÑùд
    for(i=0; i <ETH_ALEN; i++){
     


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