30a4f73cce
* Mark public API functions as unsafe. This marks the public hostcalls functions as unsafe. This is generalizing from Rust's `from_raw_fd` function, which is unsafe. The observation is that nothing prevents code using this function from passing a bogus or stale dangling file descriptor and corrupting an arbitrary open stream. Technically, some of these functions don't use file descriptors, such as random, clocks, and a few others. However I expect that in the future, random and clocks will switch to using file descriptors anyway, and it keeps the macro definitions simpler if we only have to handle one form. * Mark WasiCtx functions that operate on file descriptors unsafe too. * `fd_filestat_set_times_impl` doesn't need to be unsafe. * Remove unnecessary unsafes
wasi-common
This repo 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 1.36.0.
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!
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.