[RobiiAragon]

What and why

I implement the SDK C/C++ cancellable IPv4 GetHostByName calls with real Apple DNSService operations. Each query owns its result and native reference on one serial queue; cancellation and finalization retire the operation, and a queued cancellation cannot affect a later query reusing its ID.

I keep synchronous GetAddrInfo and default offline behavior unchanged. Numeric answers require no DNS query. I add no provider routing, account state or authorization UI.

Dependency and draft scope

I am stacking this contribution on #846 for its native socket backend and blocking HLE entry, and on the small synthetic-fixture correction in #958. GitHub’s main-based Files changed view includes both dependencies.

My resolver contribution alone is eight files, 445 added / 6 removed lines: isolated comparison.

I refreshed this draft onto main 1ae435d5 plus #958. The four #846 commits and the resolver commit replay unchanged (git range-diff), and I did not alter #846’s branch. I will rebase only the resolver contribution onto main after its dependencies are integrated; I keep this PR as a draft until then.

Checked

• I reran 333 synthetic callback checks, the real Apple DNSService localhost smoke and the complete local-network fixture target on the refreshed stack; all pass. The original resolver validation also passes ASan/UBSan and TSan.
• On the original contribution baseline I also passed sanitized LAN/LDN fixtures, the complete host tests, a host link with 999 unique forced hooks, all 190 iOS source compiles, 11 docs tests and LLVM 23.1.4 checks of the affected sources. The fresh GitHub checks apply to the refreshed head.
• My negative controls catch cancellation becoming a no-op and mutation by a late callback.
• I used an Apple M5 Max, macOS 27.2 and Xcode 27.2. I have not requalified game routes, the full Metal GPU fixture suite or Internet gameplay on this upstream revision.

Docs

• I added the resolver lifetime finding to docs/reference/services.md and regenerated the symptom index.
• No game files, keys, credentials or extracted game data are included.

I did not change the shader chain.