Module sys/externs

Extern C runtime function declarations.

All low-level extern functions for async I/O operations.

Stability

Not public API, and not intended to become it. This file is the list of C runtime symbols the async I/O layer calls, one extern per symbol, and it exists so that the typed modules above it have something to bind against. The names are the C runtime's, the signatures are raw pointers and i32s, and an entry appears or disappears whenever the emitted runtime gains or loses a function — the waker primitives arrived this way in 2026-09-11, and each such arrival is SEED-GATED, because the seed compiler emits a runtime that does not yet contain the new symbol.

Nothing here will be frozen. Callers want std/fs, std/net, std/process or std/async; the members carry no /// documentation for the same reason, and that is deliberate rather than a gap in the doc sweep.