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The C runtime could install only the ui surface; native hosts had no way to
expose device services to the guest. Add two optional host op tables:
- PocketAudioOps installs globalThis.audio with the method set the audio spec
already pins (contracts/spec/audio.ts); hosts fill the table before boot and
leave it absent otherwise (the framework player stays a no-op).
- PocketBacklightOps installs globalThis.backlight { get, set(percent) } —
pinned here until a display spec lands.
Both follow the existing ui-module installation shape; no wire changes, no
behavior change for hosts that pass no tables.
This was referenced Sep 12, 2026
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See #407 |
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What
The C runtime (
engine/quickjs-c) could install only theuisurface, so native hosts had no way to expose device services to the guest. Two optional host op tables, filled before boot:globalThis.audiowith the method set the audio spec already pins (contracts/spec/audio.ts: createStream/destroyStream/writePcm/play/pause/stop/setVolume/endStream/poll). Hosts without the table leave the global absent and the framework player stays the silent no-op it is today, so existing targets are byte-identical.globalThis.backlight{get(),set(percent)} — pinned here until a display spec exists.Both follow the existing
install_hostshape.writePcmborrows the guest buffer for the synchronous call, matching the spec's ownership rule; event lines are JSON per the spec.Why
The d211-linux host (PR #407) needs real UI sounds and panel brightness for a product app; without a host-module hook the only alternatives were product logic in the runtime or a second JS engine binding. The same hook unblocks any C host with device audio.
Validation
feat/d211-host-modules).createStream(22050,2)→writePcm→play(aplay child) →creditevent →endStream; brightness 0-100 maps onto/sys/class/backlightand the panel changes.