FA-11549 / Filesystem semantics / Member archive

Duplicated descriptors advance independent read positions · case 04

Duplicated descriptors advance independent read positions.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Deterministic in-memory filesystem model. Two descriptors are duplicates of one open-file description at offset zero. Return text read by alternating descriptors for nonnegative requested lengths; EOF reads return empty text.

Why this case matters

An offline semantic experiment for file API clients; it models only the stated operations, not a complete operating system.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
interleaved duplicate reads	`["a", "a", "b", "b"]`	`["a", "b", "c", "d"]`	Failed

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