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# wasi-common
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[![build-status]][travis] [![rustc-1.34]][rustc]
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[build-status]: https://travis-ci.org/CraneStation/wasi-common.svg?branch=master
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[travis]: https://travis-ci.org/CraneStation/wasi-common
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[rustc-1.34]: https://img.shields.io/badge/rustc-1.34+-lightgray.svg
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[rustc]: https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html
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[Wasmtime]: https://github.com/CraneStation/wasmtime
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[Lucet]: https://github.com/fastly/lucet
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[lucet-wasi]: https://github.com/fastly/lucet/tree/master/lucet-wasi
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[lucet-wasi-tracker]: https://github.com/fastly/lucet/commit/5d3efb6005391a7c71d585732a5507b00db6bb1e
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[WASI API]: https://github.com/CraneStation/wasmtime/blob/master/docs/WASI-api.md
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This repo will ultimately serve as a library providing a common implementation of
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WASI hostcalls for re-use in any WASI (and potentially non-WASI) runtimes
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such as [Wasmtime] and [Lucet].
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The library is an adaption of [lucet-wasi] crate from the [Lucet] project, and it is
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currently based on [5d3efb6005][lucet-wasi-tracker] git revision.
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Please note that the library requires Rust compiler version at least 1.34.0.
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## Supported syscalls
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We support a subset of the [WASI API], though we are working on new hostcalls
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on a regular basis. We currently implement:
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- `__wasi_args_get`
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- `__wasi_args_sizes_get`
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- `__wasi_clock_res_get`
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- `__wasi_clock_time_get`
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- `__wasi_environ_get`
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- `__wasi_environ_sizes_get`
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- `__wasi_fd_close`
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- `__wasi_fd_fdstat_get`
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- `__wasi_fd_fdstat_set_flags`
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- `__wasi_fd_filestat_get`
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- `__wasi_fd_prestat_dir_name`
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- `__wasi_fd_prestat_get`
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- `__wasi_fd_read`
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- `__wasi_fd_seek`
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- `__wasi_fd_write`
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- `__wasi_path_open`
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- `__wasi_path_filestat_get`
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- `__wasi_path_create_directory`
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- `__wasi_path_unlink_file`
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- `__wasi_poll_oneoff`
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- `__wasi_proc_exit`
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- `__wasi_random_get`
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This is enough to run basic C and Rust programs, including those that use command-line arguments,
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environment variables, stdio, and basic file operations.
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## Third-Party Code
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Significant parts of our hostcall implementations are derived from the C implementations in
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`cloudabi-utils`. See [LICENSE.cloudabi-utils](LICENSE.cloudabi-utils) for license information.
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