The VBoxUSB.sys / VBoxUSBMon.sys / .inf / .cat binaries copied from
dorssel/usbipd-win Drivers/{x64,arm64}/ ship paired SPDX
*.license files that record Oracle's GPL-3.0-only copyright. Carrying
them next to the assets keeps the provenance discoverable.
Both the existing darwin backend and the upcoming windows backend
drive USB devices from user space (IOUSBHost CGO calls vs. VBoxUSB
IOCTLs). Refactor the per-attachment URB loop out of host_darwin.go
into a platform-agnostic userspaceURBSession that talks to a URBEngine
interface; the darwin-specific dispatch becomes a 30-line
darwinIOUSBHostEngine. Linux's kernelHandoffSession is untouched.
Move hex8 into shared.go and add usbipStatusEIO so the shared session
does not depend on golang.org/x/sys/unix (Windows has no equivalent).
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