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[Benchmark] add sync #31
Description
Add the sync benchmark, including its specification, implementation, proof, and GNU comparison tests, within the scope below.
| Question | Answer |
|---|---|
| Where is the GNU code? | sync.c: main / sync_arg |
| What must I implement? | Global no-operand sync; --help/--version and invalid option combinations including -d without operands. |
| What must the spec guarantee? | Typed FilesystemSync(AllSyncTargets, SyncAllFilesystems) result; exact CLI diagnostics and exit. Persistence internals stay trusted. |
| Which APIs can I use? | Typed filesystem request/result calls selected by this entry; path/kind queries where needed, output outcomes and diagnostics. |
| What is outside this task? | All path-targeted modes: adapter lacks GNU write-only-open retry and open/sync/close failure-phase observations. |
Source paths in the table are relative to coreutils/src/.
See implementation notes, common implementation rules, and the contribution workflow.
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