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kIOFireWireCompleting
The actionable meaning of FireWire operation already completing comes from the component that returned it. The FireWire family is in the middle of completing the operation, so a second lifecycle action encounters an in-progress completion boundary.
Operational meaning
IOKit results, internal tokens, and service messages cross user space, kernel services, and hardware families for the FireWire operation already completing case. Their integer representation does not make their control-flow roles interchangeable while evaluating FireWire operation already completing.
IOKit return values, internal tokens, and service messages share an integer representation but not the same control-flow meaning for the FireWire operation already completing case. Determine whether the API returns the value or delivers it as a message before treating it as failure while evaluating FireWire operation already completing. Keep the numeric value, declared return type, and first returning operation together with kIOFireWireCompleting; the same integer can belong to a different status namespace in another API.
Build a reproducible record
| Capture | Diagnostic value |
|---|---|
| Operation ID, completion callback, state transition, workloop/thread, bus generation, and second caller. | Identifies the concrete object and operation associated with FireWire operation already completing. |
| Numeric IOReturn/message value decoded with the matching SDK header in an investigation of FireWire operation already completing. | Separates argument or lifecycle state from the provider beneath FireWire operation already completing. |
| Registry generation and first provider/client event before the result for the FireWire operation already completing case. | Creates a stable before-and-after comparison for FireWire operation already completing. |
| Known-good device or service state on the same macOS/driver build while evaluating FireWire operation already completing. | Shows whether FireWire operation already completing is the first result or a translated summary. |
For FireWire operation already completing, preserve operation ID, completion callback, state transition, workloop/thread, bus generation, and second caller before reinstalling, rebooting, clearing state, or substituting another device or provider. A success observed only after such a change is useful comparison data for FireWire operation already completing, but it does not identify the original cause.
Checks that separate the causes
- Serialize one request until its completion callback returns. Keep unrelated inputs fixed so the change remains attributable to FireWire operation already completing.
- Change one topology or lifecycle condition while keeping the request payload fixed in an investigation of FireWire operation already completing. Record the first returned status and any state transition observed during FireWire operation already completing.
- Verify cleanup and object lifetime after the controlled operation for the FireWire operation already completing case. Treat a changed result as a new boundary rather than automatic resolution of FireWire operation already completing.
Interpret the comparison
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Serialize one request until its completion callback returns. |
| The second comparison for FireWire operation already completing reproduces the same first status | Preserve lower-layer provider, driver, service, or runtime evidence before editing application data. The second controlled check was: Change one topology or lifecycle condition while keeping the request payload fixed in an investigation of FireWire operation already completing. |
| A different status replaces FireWire operation already completing after the bounded change | The operation moved to another boundary after the third controlled check. That check was: Verify cleanup and object lifetime after the controlled operation while evaluating FireWire operation already completing. Retain both results and interpret the replacement through its own API contract for FireWire operation already completing. |
Resolution criteria
Targeted correction. Make completion single-owner and defer close/reuse until the terminal callback/state. For FireWire operation already completing, modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. Each request completes exactly once and concurrent cancel/close cannot reenter completion. Re-run the original operation that produced FireWire operation already completing under its original identity and supported configuration, then keep one negative control that still produces the expected neighboring outcome.
Technical references
These owner-maintained or standards-based sources define the namespace and subsystem contract needed to verify kIOFireWireCompleting on the deployed platform version.
- Apple XNU: IOReturn definitions — defines the status namespace used for FireWire operation already completing.
- Apple: IOKit documentation — documents the API or lifecycle boundary behind FireWire operation already completing.
- Apple OSS: XNU source — provides ABI, implementation, or protocol context for FireWire operation already completing.
- Apple XNU: FireWire family common definitions — supports the portability and verification limits for FireWire operation already completing.
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