95c2addf15
* Compile wasi-common to Emscripten This commit enables cross-compiling of `wasi-common` to Emscripten. To achieve this, this commit does quite a bit reshuffling in the existing codebase. Namely, * rename `linux` modules in `wasi-common` and `yanix` to `linux_like` -- this is needed so that we can separate out logic specific to Linux and Emscripten out * tweak `dir` module in `yanix` to support Emscripten -- in particular, the main change involves `SeekLoc::from_raw` which has to be now host-specific, and is now fallible * tweak `filetime` so that in Emscripten we never check for existence of `utimensat` at runtime since we are guaranteed for it to exist by design * since `utimes` and `futimes` are not present in Emscripten, move them into a separate module, `utimesat`, and tag it cfg-non-emscripten only * finally, `to_timespec` is now fallible since on Emscripten we have to cast number of seconds, `FileTime::seconds` from `i64` to `libc::c_long` which resolves to `i32` unlike on other nixes * Fix macos build * Verify wasi-common compiles to Emscripten This commit adds `emscripten` job to Github Actions which installs `wasm32-unknown-emscripten` target, and builds `wasi-common` crate. * Use #[path] to cherry-pick mods for Emscripten This commit effectively reverses the reorg introduced in 145f4a5 in that it ditches `linux_like` mod for separate mods `linux` and `emscripten` which are now on the same crate level, and instead, pulls in common bits from `linux` using the `#[path = ..]` proc macro.
wasi-common
A Bytecode Alliance project
A library providing a common implementation of WASI hostcalls for re-use in any WASI-enabled runtime.
The wasi-common crate will ultimately serve as a library providing a common implementation of
WASI hostcalls for re-use in any WASI (and potentially non-WASI) runtimes
such as Wasmtime and Lucet.
The library is an adaption of lucet-wasi crate from the Lucet project, and it is currently based on 40ae1df git revision.
Please note that the library requires Rust compiler version at least 1.37.0.
Supported syscalls
*nix
In our *nix implementation, we currently support the entire WASI API with the exception of socket hostcalls:
sock_recvsock_sendsock_shutdown
We expect these to be implemented when network access is standardised.
We also currently do not support the proc_raise hostcall, as it is expected to
be dropped entirely from WASI.
Windows
In our Windows implementation, we currently support the minimal subset of WASI API which allows for running the very basic "Hello world!" style WASM apps. More coming shortly, so stay tuned!
Development hints
When testing the crate, you may want to enable and run full wasm32 integration testsuite. This
requires wasm32-wasi target installed which can be done as follows using rustup
rustup target add wasm32-wasi
Now, you should be able to run the integration testsuite by running cargo test on the
test-programs package with test_programs feature enabled:
cargo test --features test_programs --package test-programs
Third-Party Code
Significant parts of our hostcall implementations are derived from the C implementations in
cloudabi-utils. See LICENSE.cloudabi-utils for license information.