嵌入式使用小程序

判断是否链接网线：

#define NETCARD "eth0"
struct ethtool_value{  
            __uint32_t      cmd;  
            __uint32_t      data;  
};

int IsConnect_Router(void){
    struct ethtool_value edata;  //only pc has this struct , should define on ARM.
    int fd = -1, err = 0,temp;  
    struct ifreq ifr;  

     memset(&ifr, 0, sizeof(ifr));  
     strcpy(ifr.ifr_name, NETCARD);  
     fd = socket(AF_INET, SOCK_DGRAM, 0);  
     if (fd < 0) {  
               perror("Cannot get control socket");  
               return ERR;  
            }  
      edata.cmd = 0x0000000a;  
      ifr.ifr_data = (caddr_t)&edata;  
       err = ioctl(fd, 0x8946, &ifr);  
      if (err == 0) {  
                printf("connect:%d\n",edata.data ? 1:0);
                temp = edata.data;
            } else if (errno != EOPNOTSUPP) { 
                close(fd);
                perror("Cannot get link status");  
            return ERR;
            }  
    close(fd); 
    return temp;
}

获取本地mac：

#define NETCARD "eth0"

int GetMacAddress(char* szmac )
{
    int sock_mac;
    struct ifreq ifr_mac;
    unsigned char mac[6]={0};

    if(szmac == NULL)
    {
        return -1;
    }

    sock_mac = socket( AF_INET, SOCK_STREAM, 0 );
    if( sock_mac == -1)
    {
        perror("create socket falise...mac/n");
        return (-1); 
    }
    memset(&ifr_mac,0,sizeof(ifr_mac));
    strncpy(ifr_mac.ifr_name, NETCARD , sizeof(ifr_mac.ifr_name)-1);
    if( (ioctl( sock_mac, SIOCGIFHWADDR, &ifr_mac)) < 0)
    {
        perror("mac ioctl error:");
        return (-1);
    }

    mac[0] = ifr_mac.ifr_hwaddr.sa_data[0];
    mac[1] = ifr_mac.ifr_hwaddr.sa_data[1];
    mac[2] = ifr_mac.ifr_hwaddr.sa_data[2];
    mac[3] = ifr_mac.ifr_hwaddr.sa_data[3];
    mac[4] = ifr_mac.ifr_hwaddr.sa_data[4];
    mac[5] = ifr_mac.ifr_hwaddr.sa_data[5];
    sprintf((char *)szmac,"%02X%02X%02X%02X%02X%02X",mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);

    close( sock_mac );
    return 0;
}

获取本机IP地址：

#define IP_SIZE 16

int get_local_ip(const char *eth_inf, char *ip)  
{  
    int sd;  
    struct sockaddr_in sin;  
    struct ifreq ifr;  

    sd = socket(AF_INET, SOCK_DGRAM, 0);  
    if (-1 == sd)  
    {  
        printf("socket error: %s\n", strerror(errno));  
        return -1;        
    }  

    strncpy(ifr.ifr_name, eth_inf, IFNAMSIZ);  
    ifr.ifr_name[IFNAMSIZ - 1] = 0;  

    if (ioctl(sd, SIOCGIFADDR, &ifr) < 0)  
    {  
        printf("ioctl error: %s\n", strerror(errno));  
        close(sd);  
        return -1;  
    }  

    memcpy(&sin, &ifr.ifr_addr, sizeof(sin));  
    snprintf(ip, IP_SIZE, "%s", inet_ntoa(sin.sin_addr));  

    close(sd);  
    return 0;  
}