Info-Led bei Aktivität blinken lassen

// lanstat v0.1 (c) 2006 maz
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <linux/if.h>
#include <sys/ioctl.h>

void main(int argc, char *argv[]) 
{
  char   packet[1];
  int    sock;
  
  printf("LANstat v0.1\n\n");
  
  sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

  if(sock<0) 
  {
    printf("Socket create error!\nExit!\n");
    exit(1);
  }

  for(;;) 
  {  
	if(recv(sock, &packet, sizeof(packet), 0) < 0) 
	{
		printf("Packet receive error!\nExit!\n");
		close(sock);
		exit(1);	  
	}  
	
	usleep(100);
	system("echo 7,2 > /var/led");
	usleep(100);
	system("echo 7,1 > /var/led");	
	usleep(100);
  }

  close(sock);
  exit(0);
}

./lanstat: can't resolve symbol '__uClibc_start_main'

// lanstat v0.1 (c) 2006 maz
// lanstat v0.2h (c) 2013 hede
// license: public domain? ask maz...
#include <sys/socket.h>
#include <net/ethernet.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

void main(int argc, char *argv[]) 
{
  char   packet[256];
  int    sock;
  char   wait = 0;
  
  printf("LANstat v0.2h\n\n");
  
  sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

  if(sock<0) 
  {
    printf("Socket create error!\nExit!\n");
    exit(1);
  }

  // receives packets in nonblocking mode with LED on until it would block
  // then it deactivates LED and nonblocking mode to block until new data 
  // is received
  // then it activates nonblocking mode and the LED... 

  for(;;) 
  {  
    if (recv(sock, &packet, sizeof(packet),  wait) >= 0) 
    {
      if (!wait) {
        wait = MSG_DONTWAIT;
        system("led-ctrl switch_info_to_online");
      }
    }
    else
    {
      system("led-ctrl switch_info_to_silence");
      if (errno == EWOULDBLOCK)
      {
        wait = 0;
      }
      else
      {
        printf("Packet receive error!\nExit!\n");
        close(sock);
        exit(1);
      }
    }
  }
  // never reached
}