Update libc to `0.2.182` by ShaharNaveh · Pull Request #7247 · RustPython/RustPython

ShaharNaveh

📝 Walkthrough

Walkthrough

Bumps the libc dependency, reorganizes and expands per-target libc symbol imports and cfg gating in the POSIX module, and replaces the hardcoded const-generation script with a TOML-driven, multi-target extraction pipeline that fetches upstream docs and formats generated Rust.

Changes

Cohort / File(s)	Summary
Dependency Update `Cargo.toml`	Bumped `libc` from `0.2.180` → `0.2.182`.
POSIX libc imports & cfgs `crates/vm/src/stdlib/posix.rs`	Reorganized and split libc symbol imports into finer-grained `#[cfg(...)]` blocks, added/relocated many OS-specific constants (scheduling, file flags, spawn items), introduced FreeBSD `SF_*` exposures. No public API signatures changed.
Const-generation script `scripts/libc_posix.py`	Replaced ad-hoc extraction with a data-driven pipeline: reads `Cargo.toml` for libc version, fetches upstream docs per-target, extracts constants, groups by cfgs, integrates extras, formats output with `rustfmt`. Added dataclasses `Cfg`, `Target`, helper functions (`rustfmt`, `extract_consts`, `consts_from_url`) and TARGETS configuration.

Sequence Diagram(s)

sequenceDiagram
    participant Dev as Developer / CI
    participant Script as scripts/libc_posix.py
    participant Cargo as Cargo.toml
    participant Remote as Upstream Docs
    participant Rustfmt as rustfmt
    participant Out as Generated Rust (posix.rs)

    Dev->>Script: invoke generation
    Script->>Cargo: read libc version from Cargo.toml
    Script->>Remote: fetch source pages for each TARGET
    Remote-->>Script: return HTML/text
    Script->>Script: extract constants, group by Cfg/Target, attach extras
    Script->>Rustfmt: format generated Rust code
    Rustfmt-->>Script: return formatted code
    Script->>Out: write cfg-tagged Rust blocks into posix.rs
    Script-->>Dev: exit (success or error)

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

Attempt to automate posix consts #6117: Directly touches scripts/libc_posix.py and crates/vm/src/stdlib/posix.rs for libc constant generation automation and posix import generation.
Update libc to 0.2.177 #6300: Overlaps updates to Cargo.toml, posix import rearrangements, and generation tooling for libc constants.
Update os constant to libc 0.2.180 & target cpython 3.14 #6917: Modifies scheduling-constant handling (e.g., SCHED_DEADLINE / SCHED_NORMAL) and libc exposure logic in posix-related code.

Suggested reviewers

youknowone

Poem

🐇 I nibble TOML, hop to fetch,
constants gathered, matched to each fetch.
Rustfmt tidies every cfg line,
flags aligned, platforms fine.
A joyful hop — generation's fresh! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Update libc to `0.2.182`' directly aligns with the main change—a dependency version bump of libc from 0.2.180 to 0.2.182. While the PR includes substantial refactoring of the posix.rs file and the libc_posix.py script, the title focuses on the primary motivating change (the version update), which is appropriate for a concise PR title.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

Create PR with unit tests
Post copyable unit tests in a comment

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