Walkthrough

This change updates the POSIX standard library module by adding new constants for exit codes, refining conditional compilation attributes for platform-specific functions, and correcting the order and implementation of wait status inspection helpers to match POSIX conventions. No control flow or error handling logic is altered.

Changes

Sequence Diagram(s)

No sequence diagrams are generated as the changes are limited to attributes, constants, and function reordering without affecting control flow.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Suggested reviewers

• youknowone

Poem

A bunny hopped through POSIX code,
Tidying constants in a neat abode.
Exit codes now line the wall,
With wait helpers standing tall.
Platform quirks, now well-defined—
In every hop, clarity you'll find!
🐇✨

Configuration used: .coderabbit.yml
Review profile: CHILL
Plan: Pro

Reviewing files that changed from the base of the PR and between 93eacda and d95ec8b.

• Lib/os.py is excluded by !Lib/**
• Lib/test/test_os.py is excluded by !Lib/**

• vm/src/stdlib/posix.rs (10 hunks)

📄 CodeRabbit Inference Engine (.github/copilot-instructions.md)

**/*.rs: Follow the default rustfmt code style (cargo fmt to format)
Always run clippy to lint code (cargo clippy) before completing tasks. Fix any warnings or lints that are introduced by your changes
Follow Rust best practices for error handling and memory management
Use the macro system (pyclass, pymodule, pyfunction, etc.) when implementing Python functionality in Rust

Files:

• vm/src/stdlib/posix.rs

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration using #ifdef checks rather than providing fallback values for other platforms.

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration rather than providing fallback values for other platforms.

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration using #ifdef checks rather than providing fallback values for other platforms.

Applied to files:

• vm/src/stdlib/posix.rs

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.810Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration rather than providing fallback values for other platforms.

Applied to files:

• vm/src/stdlib/posix.rs

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-07-19T03:16:56.511Z
Learning: Applies to **/*.rs : Follow Rust best practices for error handling and memory management

Applied to files:

• vm/src/stdlib/posix.rs

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-07-19T03:16:56.511Z
Learning: Applies to **/*.rs : Use the macro system (`pyclass`, `pymodule`, `pyfunction`, etc.) when implementing Python functionality in Rust

Applied to files:

• vm/src/stdlib/posix.rs

Learnt from: arihant2math
PR: RustPython/RustPython#5790
File: build.rs:2-2
Timestamp: 2025-06-28T16:31:03.991Z
Learning: In Cargo build scripts (build.rs), the environment variable CARGO_CFG_TARGET_OS is guaranteed to exist and is automatically set by Cargo during the build process, making unwrap() safe to use when accessing this variable.

Applied to files:

• vm/src/stdlib/posix.rs

• GitHub Check: Run snippets and cpython tests (windows-latest)

vm/src/stdlib/posix.rs (7)

65-65: LGTM: Improved code readability.

The added blank lines help visually separate different groups of imported constants, improving code organization.

Also applies to: 68-68, 72-72

---

85-130: LGTM: Properly implemented exit code constants.

The new exit code constants correctly map from the exitcode crate to Python-accessible constants. The consistent pattern and type casting to i8 is appropriate for exit codes.

---

143-143: LGTM: Consistent formatting improvements.

The added blank lines provide visual separation between constant declarations, maintaining consistency with the formatting pattern used throughout the file.

Also applies to: 155-155, 166-166, 170-170, 174-174, 178-178, 182-182, 186-186

---

126-126: LGTM: Appropriate platform restrictions.

The updated conditional compilation attributes correctly exclude wasi and android targets where these user/group ID functions are not available or restricted. This follows the established pattern of platform-specific function declarations and aligns with system capabilities.

Also applies to: 132-132, 144-144, 190-190, 196-196, 202-202, 1300-1300

---

1631-1639: LGTM: Complete POSIX wait status inspection functions.

The new wcoredump and wifcontinued functions correctly implement the missing POSIX wait status inspection macros, following the established pattern and completing the standard set of wait status functions.

---

1646-1649: LGTM: Proper POSIX function ordering.

Moving wifsignaled to appear after wifstopped aligns the function order with POSIX conventions, improving standards compliance without affecting functionality.

---

1656-1669: LGTM: Critical correction of wait status functions.

The corrected implementations ensure wexitstatus and wtermsig call their respective libc functions with proper POSIX naming conventions. This fixes a critical bug where the functions may have been calling incorrect underlying implementations.

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