Module wasi

Available on WASI only.

Platform-specific extensions to std for the WebAssembly System Interface (WASI).

Provides access to platform-level information on WASI, and exposes WASI-specific functions that would otherwise be inappropriate as part of the core std library.

It exposes more ways to deal with platform-specific strings (OsStr, OsString), allows to set permissions more granularly, extract low-level file descriptors from files and sockets, and has platform-specific helpers for spawning processes.

Examples

use std::fs::File;
use std::os::wasi::prelude::*;

fn main() -> std::io::Result<()> {
    let f = File::create("foo.txt")?;
    let fd = f.as_raw_fd();

    // use fd with native WASI bindings

    Ok(())
}

Modules

• ffi
  WASI-specific extensions to primitives in the std::ffi module
• io
  WASI-specific extensions to general I/O primitives.
• prelude
  A prelude for conveniently writing platform-specific code.
• fsExperimental
  WASI-specific extensions to primitives in the std::fs module.