> and I'm calling it here:
quoted text
>
> len = ioctl(cd, 0);
> perror("ioctl");
>
> but when runnig it says:
>
> ioctl: Inappropriate ioctl for device
>
> where's the problem?

You should only call perror if ioctl returned -1.
Try:

len = ioctl(cd, 0);
if (len == -1)
   {
      perror("ioctl");
   }


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