CNA-GAP-049: StorageDevice::DeviceChanged is declared but never raised

CNA snapshot 009d40f5  ·  Known Issues › Functional gaps  ·  source links pinned to 009d40f5

The static event exists for API compatibility, but nothing in the snapshot raises it; genuine XNA 4.0 raises it through FrameworkCallbackLinker.StorageDeviceChanged when a storage device changes, and CNA's desktop storage root has no such change source.

Identifier

CNA-GAP-049

Category

Functional gap

Subsystem

Storage

Status

Open

Verified against

CNA 009d40f5 (009d40f5dd085c4e674d3479675fac84b12b3e0a)

Evidence basis

Source-verified: read at TARGET, not executed

Tests touching this area

Yes: see Current tests

Affected contract

Microsoft::Xna::Framework::Storage::StorageDevice::DeviceChanged

Expected behaviour

XNA 4.0 subscribes StorageDevice.OnDeviceChanged to FrameworkCallbackLinker.StorageDeviceChanged and raises DeviceChanged when a device is added or removed.

Actual behaviour at TARGET

StorageDevice.cpp defines the event; no CNA source raises it (the C API only subscribes and unsubscribes).

Source locations

• modules/storage/src/StorageDevice.cpp — StorageDevice::DeviceChanged definition, no raise site
• modules/storage/include/Microsoft/Xna/Framework/Storage/StorageDevice.hpp — public static event

Evidence

Checked by reading at 009d40f5 and the XNA 4.0 Storage IL in the reference cache; not executed.

Independent re-verification: Checked by reading at 009d40f5 and the decompiled XNA 4.0 Storage IL and FrameworkDispatcher; not executed. In XNA the static constructor wires StorageDevice.OnDeviceChanged to FrameworkCallbackLinker.StorageDeviceChanged, which FrameworkDispatcher.Update raises when a native System_DeviceChanged call was queued; the documented meaning is 'a device is removed or inserted'. No managed source of that call exists in the decompiled assemblies, so how often genuine XNA raises it on Windows is not established. Tests: CApi_StorageSmoke (C ABI builds only) subscribes, unsubscribes and checks stale-registration refusal for the event, but no test can make it fire because nothing in CNA raises it.

Focused reproduction

No focused reproduction is known. Nothing has been invented here; the evidence above is what exists.

Current tests

None.

Regression test

If a change source is added (for example removable media), a test that it raises the event.

Blast radius

Games that re-select storage on DeviceChanged never get the notification; on desktop the storage root does not change.

Workaround

No workaround is known.