XNU
Apple
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XNU
XNU is the computer operating system kernel developed at Apple Inc. since December 1996 for use in the OS X operating system and released as free and open source software as part of the Darwin operating system. XNU is an abbreviation of X is Not Unix. Originally developed by NeXT for the NeXTSTEP operating system, XNU was a hybrid kernel combining version 2.5 of the Mach kernel developed at Carnegie Mellon University with components from 4.3BSD and an Objective-C API for writing drivers called Driver Kit.[citation needed] After Apple acquired NeXT, the Mach component was upgraded to 3.0[citation needed], the BSD components were upgraded with code from the FreeBSD project and the Driver Kit was replaced with a C++ API for writing drivers called I/O Kit.[citation needed]