Clean up docs; specify minimum Rust version

.travis.yml

@@ -4,7 +4,7 @@ os:
     - osx
 language: rust
 rust:
-    - stable
+    - 1.34.0
     - beta
     - nightly
 matrix:

README.md

@@ -1,17 +1,29 @@
 # wasi-common
+[![build-status]][travis] [![rustc-1.34]][rustc]
 
-This repo strips away those bits of [lucet-wasi](https://github.com/fastly/lucet/tree/5d3efb6005391a7c71d585732a5507b00db6bb1e/lucet-wasi)
-which can potentially be encapsulated in a separated crate with potential plug'n'play use in both
-[Lucet](https://github.com/fastly/lucet)
-and [Wasmtime](https://github.com/CraneStation/wasmtime) projects.
+[build-status]: https://travis-ci.org/CraneStation/wasi-common.svg?branch=master
+[travis]: https://travis-ci.org/CraneStation/wasi-common
+[rustc-1.34]: https://img.shields.io/badge/rustc-1.34+-lightgray.svg
+[rustc]: https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html
+[Wasmtime]: https://github.com/CraneStation/wasmtime
+[Lucet]: https://github.com/fastly/lucet
+[lucet-wasi]: https://github.com/fastly/lucet/tree/master/lucet-wasi
+[lucet-wasi-tracker]: https://github.com/fastly/lucet/commit/5d3efb6005391a7c71d585732a5507b00db6bb1e
+[WASI API]: https://github.com/CraneStation/wasmtime/blob/master/docs/WASI-api.md
 
-This repo is strictly experimental, and based on [5d3efb6005](https://github.com/fastly/lucet/commit/5d3efb6005391a7c71d585732a5507b00db6bb1e) git revision.
+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 [5d3efb6005][lucet-wasi-tracker] git revision.
+
+Please note that the library requires Rust compiler version at least 1.34.0.
 
 ## Supported syscalls
 
-We support a subset of the [WASI
-API](https://github.com/CraneStation/wasmtime/blob/master/docs/WASI-api.md), though we are adding
-new syscalls on a regular basis. We currently implement:
+We support a subset of the [WASI API], though we are working on new hostcalls
+on a regular basis. We currently implement:
 
 - `__wasi_args_get`
 - `__wasi_args_sizes_get`
@@ -22,23 +34,23 @@ new syscalls on a regular basis. We currently implement:
 - `__wasi_fd_close`
 - `__wasi_fd_fdstat_get`
 - `__wasi_fd_fdstat_set_flags`
+- `__wasi_fd_filestat_get`
 - `__wasi_fd_prestat_dir_name`
 - `__wasi_fd_prestat_get`
 - `__wasi_fd_read`
 - `__wasi_fd_seek`
 - `__wasi_fd_write`
 - `__wasi_path_open`
+- `__wasi_path_filestat_get`
+- `__wasi_path_create_directory`
+- `__wasi_path_unlink_file`
+- `__wasi_poll_oneoff`
 - `__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](https://github.com/CraneStation/wasmtime/blob/master/wasmtime-wasi/src/wasm32.rs), 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.
+Significant parts of our hostcall implementations are derived from the C implementations in
+`cloudabi-utils`. See [LICENSE.cloudabi-utils](LICENSE.cloudabi-utils) for license information.