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Alex Crichton authored
This commit updates the wasi target with supported added in CraneStation/wasi-sysroot#10. That function allows both C and Rust to cooperate in how preopened files are managed, enabling us to learn about propened files through the same interface. The `open_parent` function in the wasi `fs` module was updated to avoid its own initialization of a global preopened map and instead delegate to libc to perform this functionality. This should both be more robust into the future in terms of handling path logic as well as ensuring the propened map is correctly set up at process boot time. This does currently require some unfortunate allocations on our side, but if that becomes an issue we can always paper over those in time!
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