https://www.amazon.com/Mac-OS-Internals-Approach-paperback/d...
https://www.amazon.com/MacOS-iOS-Internals-User-Mode/dp/0991...
https://www.amazon.com/MacOS-iOS-Internals-II-Kernel/dp/0991...
https://www.amazon.com/MacOS-iOS-Internals-III-Insecurity/dp...
https://www.amazon.com/Mac-OS-iOS-Internals-Apples/dp/111805...
However the future leads to userspace extensions, so their usefulness is kind of relative, beyond targeting pre-Catalina versions.
https://www.amazon.com/Mac-OS-Internals-Approach-paperback/d...
https://www.amazon.com/MacOS-iOS-Internals-User-Mode/dp/0991...
https://www.amazon.com/MacOS-iOS-Internals-II-Kernel/dp/0991...
https://www.amazon.com/MacOS-iOS-Internals-III-Insecurity/dp...
https://www.amazon.com/Mac-OS-iOS-Internals-Apples/dp/111805...
However the future leads to userspace extensions, so their usefulness is kind of relative, beyond targeting pre-Catalina versions.