ioctl manipulates the underlying device parameters of special files. d must be an open file descriptor. The type and value of the third parameter is dependent on the device and request.
An application may not call ioctl except for situations explicitly stated in this specification.
On success, 0 is returned. An ioctl may use the return value as an output parameter and return a non-negative value on success. On error, -1 is returned and the global variable errno is set appropriately.