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ENXIO
Two common meanings
ENXIO is often associated with special files rather than ordinary files. When opening a character or block device, it can mean that the device node exists but the associated device is absent or not available. The pathname is valid; the underlying target is not.
The code also has a distinct FIFO case. Opening a FIFO for writing with nonblocking behavior can fail when no process currently has the FIFO open for reading. That is an endpoint-availability condition, not a filesystem corruption problem. Other APIs can define additional meanings, so the call site still matters.
How to investigate
- Classify the pathname: ordinary file, device node, FIFO, socket, or another special object.
- For devices, verify that the intended hardware or virtual device is present and that the relevant driver or service is available.
- For FIFOs, verify the reader/writer startup order and choose deliberately between blocking open semantics, nonblocking retry logic, or a different IPC mechanism.
- Do not recreate a device node merely because the name exists; confirm that its major/minor mapping and the intended device are correct.
References
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