Mac OS® X and iOS Internals

EVEN MORE THAN TEN YEARS AFTER ITS INCEPTION, there is a dearth of books discussing the architec- ture of OS X, and virtually none about iOS. While there is plentiful documentation on Objective-C, the frameworks, and Cocoa APIs of OS X, it often stops short of the system-call level and implemen- tation specifics. There is some documentation on the kernel (mostly by Apple), but it, too, focuses on building drivers (with I/O Kit), and shows only the more elegant parts, and virtually nothing on the Mach core that is foundation of XNU. XNU is open source, granted, but with over a million lines of source (and comments) with some dating as far back to 1987, it’s not exactly a fun read.