For research i looked into Libusb to see how hotluging is done. For Linux, i found the corresponding source in libusb\os\linux_udev.c where a thread is started which makes a poll() on udev. However, after spending hours in the sources of Libusb I can't figure out how hotpluging in Windows is done.
In libusb\os\windows_winusb.c obviously the winusb driver is used to get a device list (static int winusb_get_device_list(..)) but this is not necearilly a hotplug thing. Can someone point me int the right direction?
I use usb4java (a libusb Java wrapper) in my project and can detect an attach/detach event just fine, but I want to know how it works.
As of Jan 28, 2024, libusb does not support hotplug on Windows. That is why you can't find it in the source code. There is a bug open to add the feature since 2015 and it looks like it may get implemented soon.