Linux Nic detection using C language-simplified code

Universal network, throughGetifaddrsIt can greatly reduce the coding workload and achieve the same effect of C-language linux Nic detection-Ultimate Edition.

#include 
 
  #include 
  
   #include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include int c_ifaddrs_netlink_status(const char *if_name ){struct ifaddrs *ifa = NULL, *ifList; if (getifaddrs(&ifList) < 0){return -1;}for (ifa = ifList; ifa != NULL; ifa = ifa->ifa_next) {if(ifa->ifa_addr->sa_family == AF_INET) {if(strcmp(ifa->ifa_name, if_name) ==0){if(!(ifa->ifa_flags & IFF_UP)){printf("DEVICE_DOWN\r\n");freeifaddrs(ifList);return 1;}if(!(ifa->ifa_flags & IFF_RUNNING)){printf("DEVICE_UNPLUGGED\r\n");freeifaddrs(ifList);return 2;}printf("DEVICE_LINKED\r\n");freeifaddrs(ifList);return 3;}} } printf(stderr, "DEVICE_NONE\r\n");freeifaddrs(ifList);return 0;}int main(int argc, char* argv[]){int i=0;if(argc != 2){fprintf(stderr, "usage: %s 
        
         \r\n", argv[0]);return -1;}i = c_ifaddrs_netlink_status(argv[1]);fprintf(stderr,"c_ifaddrs_netlink_status if_status = %d\n", i );return 0;}