libcoreservices 
This repository contains an implementation of PureDarwin's libcoreservices library, which contains code that locates system resources on disk, as well as creates application-specific temporary directories on request. This second function also requires the dirhelper daemon, which is also included.
This repository also contains a version of libCrashReporterClient, which is commonly used by PureDarwin components to supply an error message that will appear in crash logs (once crash reporting is implemented).
Sources Used
- `NSSystemDirectories.c': Taken from Apple's Libc project (version
997.90.3 - released as part of OS X 10.9.5)
- `NSSystemDirectories.h': Taken from Apple's Libc project (version
997.90.3 - released as part of OS X 10.9.5)
- `sysdir.c': Written by author
- `sysdir.h': Copied from the macOS SDK in Xcode 9.2
(build 9C40b).