&cs-str; EBADF fd is not a valid open file descriptor. EBUSY The ioctl can't be handled because the device is busy. This is typically return while device is streaming, and an ioctl tried to change something that would affect the stream, or would require the usage of a hardware resource that was already allocated. The ioctl must not be retried without performing another action to fix the problem first (typically: stop the stream before retrying). EFAULT fd is not a valid open file descriptor. EINVAL One or more of the ioctl parameters are invalid. This is a widely used error code. See the individual ioctl requests for actual causes. EINVAL or ENOTTY The ioctl is not supported by the driver, actually meaning that the required functionality is not available. ENOMEM There's not enough memory to handle the desired operation. ENOSPC On USB devices, the stream ioctl's can return this error, meaning that this request would overcommit the usb bandwidth reserved for periodic transfers (up to 80% of the USB bandwidth).