Files

Dan Gohman c3f0471ff2 Fix the return value from wasi-common's fd_readdir.

`fd_readdir` returns a "bufused" value, which indicates the number of
bytes read into the buffer. WASI libc expects this value to be equal
to the size of the buffer if the end of the directory has not yet
been scanned.

Previously, wasi-common's `fd_readdir` was writing as many complete
entries as it could fit and then stopping, but this meant it was
returning size less than the buffer size even when the directory had
more entries. This patch makes it continue writing up until the end
of the buffer, and return that number of bytes, to let WASI libc
know that there's more to be read.

Fixes #2493.

2020-12-11 10:52:54 -08:00

src

Fix the return value from wasi-common's fd_readdir.

2020-12-11 10:52:54 -08:00

WASI @ 71f0425147

bump to latest wasi submodule

2020-08-17 15:58:56 -07:00

winx

Update clippy annotation to use latest version (#2375 )

2020-11-09 09:24:59 -06:00

yanix

Bump to 0.21.0 (#2359 )

2020-11-05 09:39:53 -06:00

build.rs

Move back to only one WASI submodule (#1434 )

2020-03-30 14:45:23 -05:00

Cargo.toml

Remove duplication in wasi-common for snapshot_0 (#2444 )

2020-11-30 12:27:49 -06:00

LICENSE

Initial reorg.

2019-11-08 06:35:40 -08:00

LICENSE.cloudabi-utils

Initial reorg.

2019-11-08 06:35:40 -08:00

README.md

Fixes for cargo publish (#1416 )

2020-03-26 20:31:12 -07:00

README.md

`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_recv
sock_send
sock_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/test_programs feature enabled:

cargo test --features test-programs/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.