Fuchsia has this reference documentation:
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FIDL (or "Fuchsia Interface Definition Language") is the IPC system for Fuchsia.
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Tools for Fuchsia source contributors.
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System calls allow you to make requests from the user space into the Zircon kernel.
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Zircon is an object-based kernel. User mode code almost exclusively interacts with OS resources via object handles.
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The Zircon kernel receives a textual commandline from the bootloader, which can be used to alter some behaviours of the system.
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The purpose of Fuchsia tracing is to provide a means to collect, aggregate, and visualize diagnostic tracing information from Fuchsia user space processes and the Zircon kernel.