FreeBSD's linux compatibility layer does exactly this; it reports as "Linux", there's a linprocfs implementation that provides a Linux /proc, etc. It's a lot e

FreeBSD's linux compatibility layer does exactly this; it reports as "Linux", there's a linprocfs implementation that provides a Linux /proc, etc. It's a lot easier to emulate syscalls than it is to do something like CoLinux. Additionally, I can't imagine Microsoft would EVER let GPL'd Linux code into their kernel.