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test(macos/keld): kipc Rust-Rust echo fixture, 40-session raw evidence - #21
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… 40-session raw evidence Closes the ipc.rtt.macos.library-arm gap research note 238 records: a real cross-process (not in-process, unlike research note 140) client/server pair over the same authenticated kipc wire path the product uses (SessionToken HELLO, echo_call/echo_invoke, serve_echo_session), pinned via git/rev to Keld gyldlab/keld@4fbf94b. Proposed as research note 242 Gap 1 (2026-09-10); built, negative-control-verified (forged token rejected with KELD-IPC-007, no output file produced), and run as the full registry-compliant campaign the same session: 20 sessions x 100,000 calls per tier (small = codec-pinned 6-byte payload, representative = 1,024-byte payload binary-searched against the live postcard encoding), fresh-process cache state, client-owned monotonic clock, handshake excluded from the timed deltas per the IPC-RTT oracle. 40 raw session documents under macos/bench/results/ipc-rtt/ (.raw.json: no schema/result.v2.schema.json wrapper -- that schema models one session with multiple comparator arms, not this registry's block-bootstrap-by-independent-session sample_policy; the same gap the sole prior IPC-RTT result, KEL-99 on Windows, already left unresolved at 1 session. Aggregate statistics live in the companion research note, computed from and citing these raw files directly. Device: Apple M4 Mac mini (Mac16,10), macOS 26.5.1 (25F80), arm64, CENTILLIONAIREs-Mac-mini.local, AC power. rustc/cargo 1.97.1. python3 schema/check.py: all contract checks passed (unaffected by this addition; it validates the schemas themselves, not the results corpus).
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📝 WalkthroughWalkthroughAdds a macOS Rust KIPC echo fixture with server and client binaries. The client supports authenticated sessions, two payload tiers, timing collection, forged-token validation, and JSON result output. Documentation defines build, execution, and sampling procedures. ChangesRust KIPC echo fixture
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Client
participant Server
participant KIPC
participant ResultFile
Client->>Server: Read app link and connect
Server->>KIPC: Serve authenticated echo session
Client->>KIPC: Send handshake and echo calls
KIPC-->>Client: Return validated replies
Client->>Client: Measure handshake and call durations
Client->>ResultFile: Write JSON measurements
Merge Risk: 🟡 Moderate · up to The benchmark fixture can overwrite files or expose its session credential on shared systems, and its forged-token check can report success for unrelated failures. These issues should be corrected before relying on or merging the fixture and its evidence. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@macos/keld/kipc-rust-echo/Cargo.toml`:
- Around line 12-13: Update the fixture’s README build command to use cargo
build --release --locked, ensuring the existing Cargo.lock dependency graph is
used without re-resolving dependencies.
In `@macos/keld/kipc-rust-echo/src/client.rs`:
- Around line 151-156: Update the --bad-token handling around echo_call so
Err(error) returns a client failure instead of treating every error as
successful token rejection; preserve success only when the expected forged-token
rejection is explicitly confirmed. Update the README negative-control command to
capture server stderr, wait for server termination, require nonzero client and
server exit statuses, and verify KELD-IPC-007 before reporting success.
In `@macos/keld/kipc-rust-echo/src/server.rs`:
- Line 47: Update the app-link file creation in the server’s match expression to
use OpenOptions with create_new(true), and place the file in a private run
directory rather than the predictable shared /tmp path. Preserve the existing
write behavior while ensuring symlink replacement cannot redirect file creation.
- Line 47: Update the app-link file creation around File::create to create it
exclusively with mode 0o600, preventing access by other local identities. Ensure
the app-link file is removed after the client finishes using it on both
successful completion and error paths, covering the surrounding endpoint and
SessionToken handling flow.
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📒 Files selected for processing (44)
macos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s01.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s02.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s03.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s04.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s05.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s06.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s07.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s08.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s09.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s10.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s11.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s12.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s13.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s14.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s15.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s16.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s17.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s18.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s19.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-representative.fresh-process.s20.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s01.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s02.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s03.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s04.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s05.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s06.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s07.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s08.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s09.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s10.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s11.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s12.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s13.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s14.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s15.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s16.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s17.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s18.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s19.raw.jsonmacos/bench/results/ipc-rtt/2026-09-10.kel129-macos-rust-100k-small.fresh-process.s20.raw.jsonmacos/keld/kipc-rust-echo/Cargo.tomlmacos/keld/kipc-rust-echo/README.mdmacos/keld/kipc-rust-echo/src/client.rsmacos/keld/kipc-rust-echo/src/server.rs
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- server.rs: mint the app-link file with create_new + mode 0o600 instead of File::create, so a pre-planted symlink at the (predictable /tmp) path cannot redirect the write, and the live session token is not world-readable. Remove the file once a connection is accepted (the client has already read it) and on the accept-error path. - client.rs: the --bad-token negative control no longer claims a confirmed KELD-IPC-007 reject from the client's own Err(_) alone. Verified empirically that handshake_server closes without a reply on a token mismatch (an intentional anti-oracle design in crates/keld-ipc/src/admission.rs), so the client can only observe a plain I/O EOF, never IpcError::HelloAuth directly. - README.md: build with --locked (uses the committed Cargo.lock as-is); the negative-control procedure now captures the server's stderr and greps it for KELD-IPC-007 as the actual confirmation, alongside the client's own exit code and the absence of an output file. Rebuilt, reran the negative control, a symlink-preplant attempt, and one real session end-to-end; all behave as documented.
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#21) * test(macos/keld): add the KEL-129 kipc Rust-Rust echo fixture and its 40-session raw evidence Closes the ipc.rtt.macos.library-arm gap research note 238 records: a real cross-process (not in-process, unlike research note 140) client/server pair over the same authenticated kipc wire path the product uses (SessionToken HELLO, echo_call/echo_invoke, serve_echo_session), pinned via git/rev to Keld gyldlab/keld@4fbf94b. Proposed as research note 242 Gap 1 (2026-09-10); built, negative-control-verified (forged token rejected with KELD-IPC-007, no output file produced), and run as the full registry-compliant campaign the same session: 20 sessions x 100,000 calls per tier (small = codec-pinned 6-byte payload, representative = 1,024-byte payload binary-searched against the live postcard encoding), fresh-process cache state, client-owned monotonic clock, handshake excluded from the timed deltas per the IPC-RTT oracle. 40 raw session documents under macos/bench/results/ipc-rtt/ (.raw.json: no schema/result.v2.schema.json wrapper -- that schema models one session with multiple comparator arms, not this registry's block-bootstrap-by-independent-session sample_policy; the same gap the sole prior IPC-RTT result, KEL-99 on Windows, already left unresolved at 1 session. Aggregate statistics live in the companion research note, computed from and citing these raw files directly. Device: Apple M4 Mac mini (Mac16,10), macOS 26.5.1 (25F80), arm64, CENTILLIONAIREs-Mac-mini.local, AC power. rustc/cargo 1.97.1. python3 schema/check.py: all contract checks passed (unaffected by this addition; it validates the schemas themselves, not the results corpus). * fix(macos/keld): harden kipc-rust-echo per CodeRabbit review - server.rs: mint the app-link file with create_new + mode 0o600 instead of File::create, so a pre-planted symlink at the (predictable /tmp) path cannot redirect the write, and the live session token is not world-readable. Remove the file once a connection is accepted (the client has already read it) and on the accept-error path. - client.rs: the --bad-token negative control no longer claims a confirmed KELD-IPC-007 reject from the client's own Err(_) alone. Verified empirically that handshake_server closes without a reply on a token mismatch (an intentional anti-oracle design in crates/keld-ipc/src/admission.rs), so the client can only observe a plain I/O EOF, never IpcError::HelloAuth directly. - README.md: build with --locked (uses the committed Cargo.lock as-is); the negative-control procedure now captures the server's stderr and greps it for KELD-IPC-007 as the actual confirmation, alongside the client's own exit code and the absence of an output file. Rebuilt, reran the negative control, a symlink-preplant attempt, and one real session end-to-end; all behave as documented.
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Summary
Closes the
ipc.rtt.macos.library-armgap research note 238 records: a real cross-process kipc echo measurement (client and server as two separate OS processes over a Unix domain socket, using the actualkeld-ipcwire path —SessionTokenHELLO,echo_call/echo_invoke,serve_echo_session) rather than the in-process, no-OS-boundary shape research note 140 used.Pinned via
git/revtogyldlab/keld@4fbf94bbb755854058067b986877177f00b25a39. Proposed as research note 242 Gap 1 and executed the same session (2026-09-10): negative-control verified (forged token rejectedKELD-IPC-007, no output file produced), then run as the full registry-compliant campaign — 20 sessions x 100,000 calls per tier (small = codec-pinned 6-byte payload, representative = 1,024-byte payload), fresh-process cache state, client-owned monotonic clock, handshake excluded from timed deltas.Pooled p99 (block-bootstrap 95% CI, 2,000 resamples, session blocks): small
[9.25, 9.625] us, representative[10.083, 10.459] us— both far under the 100 us budget. Full statistics and the aggregate write-up are in a companion keld-research note (not part of this PR).40 raw session documents under
macos/bench/results/ipc-rtt/, named.raw.json:schema/result.v2.schema.jsonmodels one session with multiple comparator arms, not this registry's block-bootstrap-by-independent-sessionsample_policy.ipc— the same gap the only priorIPC-RTTresult (KEL-99, Windows, 1 session) already left unresolved. Not fixed here; named as a known registry/schema gap.Review gates
none (test fixture + raw evidence, no product/schema/dependency change)
Tests
python3 schema/check.py: all contract checks passed (unaffected by this addition — it validates the schemas/registry themselves, not the results corpus)KELD-IPC-007), no output file produced — verified twice, including immediately before this commitcalls_timed == 99999(call 1 folds intohandshake_ns)Platforms
macOS only (Apple M4 Mac mini, macOS 26.5.1 25F80, arm64,
CENTILLIONAIREs-Mac-mini.local, AC power). No Windows/Linux claim.Perf impact
none (new diagnostic fixture; adds no product code)
Summary by CodeRabbit