char line[128];
  int io;
  FILE *fp = fopen("/proc/diskstats", "r");

   while(fgets(line, sizeof line, fp)) {
       fputs(line, stdout);
       if(dev_t_conversion(line) == get_file_devid("/")) {
            sscanf(line, "%*dt%d", &io);
            printf("%dn", io);
            fclose(fp);
        }
    }