EBADF              The s argument is not a valid socket
                       descriptor.
    EINTR              A signal was caught during the ioctl()
                       operation.
    If an underlying device driver detects an error, errno might be
    set to one of the following values:
    EINVAL             Either the request or the arg argument is not
                       valid.
    ENOTTY             Reserved for HP use. The s argument is not
                       associated with a network device, or the
                       specified request does not apply to the
                       specific network device.
    ENXIO              The request and arg arguments are valid for
                       this device driver, but the service requested
                       cannot be performed on the device.