=== NTSYNC(9)

Contact: Konstantin Belousov <kib@FreeBSD.org>

Recently there was a stream of articles hyping the Linux driver ntsync which implemented a helper for Wine to accelerate Windows NT synchronization primitives.
The substrates to implement semaphores, mutexes, and events from the Win32 land are provided by it.
The driver represents each NT object as a file descriptor, which has the set of the ioctls defined that directly map into the Win32 operations.

The project implemented the driver providing the compatible ntsync interface as specified in the Linux 7.0-rc3 document Documentation/userspace-api/ntsync.rst.
Both native FreeBSD interface, and the Linux ABI compatibility layers, are written.

To test the driver, a minimal version of the Linux kernel test harness was ported.
FreeBSD driver follows the interface details as encoded by the tests, when a discrepancy between Linux documentation and tests was found.

Both the driver and its man page man:ntsync(4) were written from scratch, without consulting the Linux source code.

Sponsor: The FreeBSD Foundation