Linux下获得本机IP及网卡状态的函数

// 检测网络连接

// routeName: 网络连接名称，如ppp0、eth0等

// 返回值: 网络正常返回0，异常返回-1

int CheckNetLink(const char *routeName)

{

      register int fd, intrface;

       struct ifreq buf[16];

       struct ifconf ifc;

       if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0)

       {

              ifc.ifc_len = sizeof(buf);

              ifc.ifc_buf = (caddr_t) buf;

              if (!ioctl(fd, SIOCGIFCONF, (char *) &ifc))

              {

                     intrface = ifc.ifc_len / sizeof (struct ifreq);

                     while (intrface-- > 0)

                     {

                            if (strcmp(buf[intrface].ifr_name, routeName) == 0)

                            {

                                   ioctl(fd, SIOCGIFFLAGS, (char *) &buf[intrface]);                            

                                   if ((buf[intrface].ifr_flags & IFF_UP) && (buf[intrface].ifr_flags & IFF_RUNNING))

                                   {

                                          shutdown(fd, SHUT_RDWR);

                                          close(fd);

                                          //printf("\n%s is UP & RUNNING\n", routeName);

                                          return OK;

                                   }

                                   else

                                   {

                                          shutdown(fd, SHUT_RDWR);

                                          close(fd);

                                          //printf("\n%s is DOWN\n", routeName);

                                          return ERROR;

                                   }

                            }

                     }

                     shutdown(fd, SHUT_RDWR);

                     close(fd);

                     //printf("\n%s is not exist\n", routeName);

                     return ERROR;

              }     

       }

       return ERROR;

}

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