[BRLTTY] BRLTTY in GRUB2

[Vladimir 'φ-coder/phcoder' Serbinenko]

In GRUB to check status of USB transfer we use
grub_usb_err_t
grub_usb_check_transfer (grub_usb_transfer_t trans, grub_size_t *actual);
Which either returns an error (on failure), GRUB_USB_ERR_WAIT (if not 
yet completed) or 0 and sets *actual if completed
How does that map onto
void *
usbReapResponse (UsbDevice *device, unsigned char endpointAddress,
          UsbResponse *response, int wait)

?

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko