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The Unix socket implementation adds vectored receiving to the host and Python layers. The Python API validates writable buffer iterables, receives data across buffers, and returns ancillary data, flags, and the address.

Changes: Unix socket receive

Layer / File(s)	Summary
Host vectored receive crates/host_env/src/socket.rs	Adds RecvMsgIntoResult and recvmsg_into for vectored uninitialized buffers. Ancillary storage is aligned, platform-width conversions are checked, and recvmsg delegates to the new receive path.
Python socket API crates/stdlib/src/socket.rs, extra_tests/snippets/stdlib_socket.py	Adds PySocket.recvmsg_into with buffer and ancillary-size validation, byte distribution, and discard-mode handling. Ancillary payloads move into Python bytes objects. A socket-pair test checks iterable exhaustion and data distribution across two buffers.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant PythonCaller
  participant PySocket
  participant host_env_socket
  participant recvmsg
  PythonCaller->>PySocket: Call recvmsg_into with writable buffers
  PySocket->>host_env_socket: Receive into temporary buffers
  host_env_socket->>recvmsg: Submit iovecs and ancillary storage
  recvmsg-->>host_env_socket: Return bytes read, flags, address, and control data
  host_env_socket-->>PySocket: Return RecvMsgIntoResult
  PySocket->>PySocket: Distribute bytes and parse ancillary data
  PySocket-->>PythonCaller: Return count, ancillary data, flags, and address

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Suggested reviewers: youknowone

Receiving into buffers works through the existing timeout path, but an iterable that raises an exception reports a misleading TypeError instead. This is a bounded issue that can be fixed before merge or accepted for follow-up.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely identifies the main change: implementing Unix socket.recvmsg_into.
Docstring Coverage		Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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