This repo strips away those bits of lucet-wasi which can potentially be encapsulated in a separated crate with potential plug'n'play use in both Lucet and Wasmtime projects.

This repo is strictly experimental.

Supported syscalls

We support a subset of the WASI API, though we are adding new syscalls on a regular basis. We currently implement:

__wasi_args_get
__wasi_args_sizes_get
__wasi_clock_res_get
__wasi_clock_time_get
__wasi_environ_get
__wasi_environ_sizes_get
__wasi_fd_close
__wasi_fd_fdstat_get
__wasi_fd_fdstat_set_flags
__wasi_fd_prestat_dir_name
__wasi_fd_prestat_get
__wasi_fd_read
__wasi_fd_seek
__wasi_fd_write
__wasi_path_open
__wasi_proc_exit
__wasi_random_get

This is enough to run basic C and Rust programs, including those that use command-line arguments, environment variables, stdio, and basic file operations.

Third-Party Code

src/wasm32.rs is copied from wasmtime, along with the associated LICENSE.wasmtime file.

Significant parts of our syscall implementations are derived from the C implementations in cloudabi-utils. See LICENSE.cloudabi-utils for license information.