Generally, operating systems provide a library that sits between normal programs and the rest of the operating system, usually the C library (libc), such as glibc. This library handles the low-level details of passing information to the kernel and switching to supervisor mode, as well as any data processing and preparation which does not need to be done in privileged mode. Ideally, this reduces the coupling between the operating system and the application, and increases portability.
On exokernel based systems, the library is especially important as an intermediary. On exokernels, OSes shield user applications from the very low level kernel API, and provide abstractions and resource management
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