Device and Monitor shared one manual-reset event across all in-flight
IOCTLs, while the session layer runs one goroutine per endpoint: the
first completion released every GetOverlappedResult waiter with the
first operation's byte count, returning before the driver finished
writing the other buffers. Each overlappedIoctl call now owns its
event, making concurrent URBs (and aborts) on one handle safe.
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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