Armbian/Raspberry led blink daemon

ifblinkd.c

#include <wiringPi.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#define TRAFFIC_TRESH 64
#define BLINK_DELAY 83

#define TX_LED 7 // GREEN
#define RX_LED 0 // RED

typedef struct{
    long long tx;
    long long rx;
    long long lasttx;
    long long lastrx;
    bool txled;
    bool rxled;
}iface_t;

void getstatus(char *dev, iface_t *if1){
     FILE *netinfo = fopen("/proc/net/dev", "r");
     if(netinfo == NULL){
         exit(-1);
     }
     char buff[256];
     while(fgets(buff, sizeof(buff), netinfo)){
         long long tx = 0;
         long long rx = 0;
         char ifname[32];
         sscanf( buff," %[^:]: %Lu %*u %*u %*u %*u %*u %*u %*u %Lu %*u %*u %*u %*u %*u %*u %*u",ifname, &rx, &tx );
            if(strcmp(ifname,dev)==0){
                //printf("%s %Lu %Lu tx/rx\n",ifname ,tx,rx);
                if1->lasttx = if1->tx;
                if1->lastrx = if1->rx;
                if1->tx = tx;
                if1->rx = rx;
            }
     }
     if(fclose(netinfo) != 0){
         exit(-1);
     }
}

int main (int argc, char **argv){
  if (argc!=2){
    printf("ifled <iface> \n");
    return -1;
  }

  wiringPiSetup () ;
  pinMode (TX_LED, OUTPUT) ;
  pinMode (RX_LED, OUTPUT) ;
  digitalWrite (TX_LED,LOW);
  digitalWrite (RX_LED,LOW);

  iface_t ifstats;
  ifstats.tx = 0;
  ifstats.rx = 0;
  ifstats.lasttx = 0;
  ifstats.lastrx = 0;
  ifstats.rxled = false;
  ifstats.txled = true;

  for (;;)
  {
    getstatus(argv[1],&ifstats);

    if( (ifstats.tx - ifstats.lasttx) > TRAFFIC_TRESH ){
        ifstats.txled = !ifstats.txled;
    }
    else{
    	ifstats.txled = false;
    }

    if ((ifstats.rx - ifstats.lastrx) > TRAFFIC_TRESH){
    	ifstats.rxled = !ifstats.rxled;
    }
    else {
    	ifstats.rxled = false;
    }

    digitalWrite(RX_LED, ifstats.rxled);
    digitalWrite(TX_LED, ifstats.txled);

    //printf("TX: %Lu\tRX: %Lu\n",tx,rx);
    delay(BLINK_DELAY);
  }
  return 0 ;
}