Unlike most other Mach-based operating systems, such as GNU HURD (which, contrary to popular belief, does exist), XNU implements UNIX system calls in the same way as a BSD system.

不同于大部分基于Mach的操作系统，比如GNUHURD（与人们以为的恰恰相反，它的确存在），XNU采用与BSD系统相同的方式来实行UNIX系统调用。