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The WASI tutorial for compiling C/Rust to wasm and running it has some useful information on this front: https://github.com/bytecodealliance/wasmtime/blob/master/doc...

We wouldn't have been able to put wasm in Firefox like this if there wasn't decent compiler/runtime support via the clang ecosystem.

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That C code has a bug where the inner write loop writes the same portion of the buffer after a short write.

The Rust code, by contrast, slurps up the entire file contents into a buffer before writing it out. If someone is going to write code that way why even bother with a low-level language? (This "memory is infinite" mentality is something I've noticed in other Rust projects, even major ones like mio.)

Good catch on that bug! I'll fix that.

Beyond that, that file is just a simple example for showing how to work with the toolchain and the sandbox.

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