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kIOFireWireTalkingAndListening
kIOFireWireTalkingAndListening indicates that the same FireWire isochronous channel or program is configured for both talker and listener roles. Check channel ownership and resource allocation rather than treating the value as a generic transport failure.
The contract boundary
IOKit return values, internal tokens, and service messages share an integer representation but not the same control-flow meaning. Determine whether the API returns the value or delivers it as a message before treating it as failure.
Capture before changing state
| Capture | Diagnostic value |
|---|---|
| Channel number, talk/listen allocation objects, isoch resources, bus generation, and program ownership. | Identifies the concrete object and operation associated with FireWire isochronous channel both talking and listening. |
| Numeric IOReturn/message value decoded with the matching SDK header. | Separates argument or lifecycle state from the provider beneath kIOFireWireTalkingAndListening. |
| Registry generation and first provider/client event before the result. | Ties the role conflict to one channel allocation, owner, and bus generation. |
| Known-good device or service state on the same macOS/driver build. | Shows whether kIOFireWireTalkingAndListening is the first result or a translated summary. |
Focused experiments
- Allocate a listener-only and then talker-only control channel.
- Change one topology or lifecycle condition while keeping the request payload fixed.
- Verify cleanup and object lifetime after the controlled operation.
A defensible resolution
Targeted correction. Separate talker and listener roles or use distinct channels/resources as required by the device topology.
Acceptance criterion. Role allocation is unambiguous and bus reset recovery recreates the intended single role.
Technical references
- Apple XNU: IOReturn definitions — defines the status namespace used.
- Apple: IOKit documentation — documents the API or lifecycle boundary behind it.
- Apple OSS: XNU source — provides ABI, implementation, or protocol context.
- Apple XNU: FireWire family common definitions — supports the portability and verification limits.
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