trident/os/wasi.md

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WASI — Operating System

← OS Reference | VM: WASM

Runtime Parameters

Parameter Value
VM WASM
Runtime binding wasi.ext.*
Process model Single-process, capability-based
Storage model Filesystem (capability-scoped)
Cost model Wall-clock time
Interop WASI preview 2, component model

Runtime Binding (wasi.ext.*)

  • Filesystem — open, read, write, close (capability-gated) (planned)
  • Clock — monotonic clock, wall clock (planned)
  • Random — cryptographic random bytes (planned)
  • Stdio — stdin, stdout, stderr (planned)

Notes

WASI (WebAssembly System Interface) provides a POSIX-like API for WASM modules running outside the browser. Runtimes include wasmtime, wasmer, and WasmEdge.

The same .wasm binary produced for blockchain OSes (Near, Cosmos, ICP) can run under WASI — only the host function imports differ. WASI provides filesystem, clock, and random capabilities instead of blockchain storage and accounts.

For WASM VM details (instruction set, lowering path, bytecode format), see wasm.md.

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