why event.inner.length == 4294967295 ep0_loop return

[imatespl]

I run usb-proxy in banana pi m2 plus， when i disconnect usb device from broad then raw_gadget return 4294967295, this number ep0_loop break, so usb_proxy main thread Segmentation fault
./usb-proxy --device=musb-hdrc.4.auto --driver=musb-hdrc
Device is: musb-hdrc.4.auto
Driver is: musb-hdrc
vendor_id is: -1
product_id is: -1
Device opened successfully
Setup USB config successfully
Start hotplug_monitor thread, thread id(10504)
Start for EP0, thread id(10487)
event: connect, length: 0
Hotplug event
Received SIGINT, stopping...
event: unknown, length: 4294967295
End for EP0, thread id(10487)
Segmentation fault

i want to known why event.inner.length == 4294967295 ep0_loop return，thanks

[AristoChen]

Hi @imatespl ,

Thank you for being interesting in this project, and sorry for the late reply.

There is a hotplug detecting mechanism for USB device, once the USB device hotplug event is detected, it will send a SIGINT signal, and which will cause usb_raw_event_fetch recived a EINTR, inorder to identify whether the EINTR is caused by hotplug or real EINTR, so I set the length to UINT_MAX(which is 4294967295) to identify that it is highly possible that EINTR is caused by USB device hotplug

[imatespl]

Thank you very very much，this make process Segmentation fault，when remove usb device from host

		if (event.inner.length == 4294967295) {
			printf("End for EP0, thread id(%d)\n", gettid());
			return;
		}