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EDEVERR
Keep the device context attached to the error
EDEVERR is a BSD device-error status. Its meaning depends on the device and operation that surfaced it; the same errno cannot identify whether a printer, removable medium, network interface, or another device class produced the underlying condition.
The practical next step is to retain the lower-level evidence that errno alone omits: device identity, command or I/O request, hardware or driver status, and retryability. Replacing EDEVERR with a generic “I/O error” loses exactly the context needed to distinguish media, readiness, consumable, and transport conditions.
Diagnostics to preserve
- The device node or service identifier, operation type, transfer size, and direction.
- Driver, framework, or peripheral logs that may contain a more specific status code.
- Whether the same operation succeeds on another device instance or after a documented readiness transition.
References
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