Support isochronous transfers in Dummy HCD/UDC about raw-gadget

[xairy]

Alan posted a testing-grade patch from pre-2008 era for this.

[GPlays09]

since this isn't supported yet, is there a way to check if there is any data waiting to be read at a specific endpoint and how much there is?

[xairy]

I think you can do this via usb_ep_fifo_status, but it's not exposed in Raw Gadget (#12). Also the Dummy UDC does not appear to implement the fifo_status handler, so usb_ep_fifo_status won't work with it as is: you would need to add support for fifo_status to the Dummy UDC first. But even if you do, you still cannot use it for isochronous transfers before those are implemented.

But in case your question is not related to isochronous transfers and your goal is just to deal with Raw Gadget blocking on I/O, what you can do is create a thread for handling I/O on an endpoint and send any signal to that thread (via e.g. pthread_kill) to interrupt the I/O ioctl when needed.