Retry interrupted calls without hiding cancellation
Every interrupted call is retried automatically, so a cancelled operation keeps waiting after shutdown begins.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Error handling · Cancellation
Estimated field mix
- Systems programming70%
- Real-time systems30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional local agent watches generated inbox files and schedules bounded processing. Direct system calls are scattered across the code, mishandle interrupted operations, and make tests platform-dependent. Build a Rust OS adapter with temporary fixture directories; no kernel module, elevated privilege, or production host modification is required.
Setup prerequisites
- System calls
- File descriptors
- Monotonic clocks
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Retry only declared interrupt errors
- Check cancellation and deadline between attempts
- Preserve noninterrupt error identity
Implementation constraints
- Retry policy belongs beside the operation contract, not in a catch-all error loop.
Verification to include
- Inject two interrupts followed by success before deadline.
- Cancel between interrupts and verify no further system call is attempted.
Deliverables
- Interrupt-aware retry helper and cancellation tests
Rollout and recovery
Adopt per operation after its retry safety is reviewed.
Value of the work
For the engineer: Practice OS error semantics, partial I/O, portability and deterministic abstraction boundaries.
For the team: Review host-facing code whose retries, resource limits, and platform differences are explicit before packaging it as a local agent.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.