Yuzhu Shen b086ad5493 Make Linux descriptor cleanup fork-safe (#47654) ...

## Why

Linux descriptor cleanup used allocating directory enumeration after `fork`. The child needs allocation-free cleanup while preserving Rust's spawn-error channel until `exec` succeeds.

## What changed

- Mark unrelated descriptors close-on-exec with `close_range(CLOSE_RANGE_CLOEXEC)`, leaving stdio and explicitly preserved descriptors' flags untouched.
- Fall back to stack-backed `getdents64` enumeration of the child's descriptor table when `close_range` fails.
- Document best-effort cleanup: failures allow launch to proceed and may leave unrelated descriptors inherited.

## Testing

Add Linux tests for descriptor inheritance, unsorted and duplicate allowlists, unchanged parent descriptors, fallback cleanup above a lowered descriptor limit, preserved exec-error reporting, and successful launch when both cleanup paths fail. Retain MCP coverage for descriptor exclusion in servers and descendants.

GitOrigin-RevId: 13abb95f82557324c7b40feb36bd6f806d60674e

2026-09-23 20:20:06 +00:00

..

src

Make Linux descriptor cleanup fork-safe (#47654)

2026-09-23 20:20:06 +00:00

tests

Make Linux descriptor cleanup fork-safe (#47654)

2026-09-23 20:20:06 +00:00

BUILD.bazel

[3/4] Add executor-backed RMCP HTTP client (#18583)

2026-04-22 17:38:04 -07:00

Cargo.toml

Preserve MCP request trace context across transport workers (#47212)

2026-09-22 06:47:07 +00:00