Module wasmtime_wasi::preview2

Wasmtime’s WASI Preview 2 Implementation

Welcome to the (new!) WASI implementation from the Wasmtime team. The goal of this implementation is to support WASI Preview 2 via the Component Model, as well as to provide legacy Preview 1 host support with an adapter that is implemented in terms of the Preview 2 interfaces.

Presently, this crate is experimental. We don’t yet recommend you use it in production. Specifically:

• it does not yet support a synchronous rust embedding
• polling and streams need a redesign. IO that currently should be non-blocking may be blocking. poll probably doesn’t work at all.
• its internal organization could use some love
• the wit files in tree describing preview 2 are not faithful to the standards repos

Once these issues are resolved, we expect to move this namespace up to the root of the wasmtime-wasi crate, and move its other exports underneath a pub mod legacy with an off-by-default feature flag, and after 2 releases, retire and remove that code from our tree.

Re-exports

• pub use clocks::HostMonotonicClock;
• pub use clocks::HostWallClock;
• pub use stream::InputStream;
• pub use stream::OutputStream;
• pub use table::Table;
• pub use table::TableError;

Modules

• clocks
• pipe
  Virtual pipes.
• preview1
• preview2
• random
• stdio
• stream
• table
• wasi

Structs

• DirPerms
• FilePerms
• I32Exit
  An error returned from the proc_exit host syscall.
• WasiCtx
• WasiCtxBuilder

Enums

• SystemTimeSpec
  A value for specifying a time.

Traits

• RngCore
  The core of a random number generator.
• WasiView