char tmp[4];
   FILE *f;
   int cpu = -1;

   if (!(f = fopen("/proc/stat", "r")))
      return -1;

   while (fscanf(f, "cp%s %*u %*u %*u %*u %*u %*u %*u %*u\n", (char *)&tmp) == 1)
      cpu++;

   fclose(f);
   return cpu;