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Fix _overlapped segfault and missing _winapi constants#6907

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youknowone merged 1 commit intoRustPython:mainfrom
youknowone:winapi
Jan 30, 2026
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Fix _overlapped segfault and missing _winapi constants#6907
youknowone merged 1 commit intoRustPython:mainfrom
youknowone:winapi

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@youknowone youknowone commented Jan 30, 2026 •
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  • Fix from_windows_err using new_exception_empty on OSError subclasses (ConnectionRefusedError, ConnectionAbortedError), which caused segfault in release builds due to debug_assert on type size mismatch
  • Move ConnectPipe from instance method to module-level function
  • Add Destructor for Overlapped to cancel pending I/O on object cleanup
  • Add NMPWAIT_NOWAIT, NMPWAIT_USE_DEFAULT_WAIT, NMPWAIT_WAIT_FOREVER constants to _winapi

Summary by CodeRabbit

  • New Features
    • Added support for connecting to named pipes on Windows.
    • Introduced new pipe wait mode constants for Windows pipe operations.
    • Enhanced cleanup and resource management for Windows I/O operations when objects are garbage-collected.

✏️ Tip: You can customize this high-level summary in your review settings.

@youknowone
Fix _overlapped segfault and missing _winapi constants
652eb1a 
- Fix from_windows_err using new_exception_empty on OSError subclasses
  (ConnectionRefusedError, ConnectionAbortedError), which caused segfault
  in release builds due to debug_assert on type size mismatch
- Move ConnectPipe from instance method to module-level function
- Add Destructor for Overlapped to cancel pending I/O on object cleanup
- Add NMPWAIT_NOWAIT, NMPWAIT_USE_DEFAULT_WAIT, NMPWAIT_WAIT_FOREVER
  constants to _winapi
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coderabbitai bot commented Jan 30, 2026 •
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📝 Walkthrough

Walkthrough

This PR refactors Windows overlapped I/O error handling by simplifying errno translation to a generic IO error, adds explicit destructor support to the Overlapped pyclass with cleanup semantics, reintroduces ConnectPipe as a standalone function, and exposes three new pipe-related constants in the Windows API module.

Changes

Cohort / File(s) Summary
Overlapped I/O Refactoring
crates/stdlib/src/overlapped.rs		 Reworked error translation to use generic IO errors instead of specific Windows errno mappings; added destructor implementation to Overlapped pyclass with I/O cancellation and resource cleanup; reintroduced ConnectPipe as top-level #[pyfunction]; updated public API surface and import signatures.
Windows API Constants
crates/vm/src/stdlib/winapi.rs		 Exposed three new pipe wait constants (NMPWAIT_NOWAIT, NMPWAIT_USE_DEFAULT_WAIT, NMPWAIT_WAIT_FOREVER) in the Windows Pipes namespace.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

  • new_last_{os,errno}_error #6381: Modifies overlapped.rs Windows error handling and imports, with overlapping changes to errno-based error construction and helper functions.

Poem

🐰 Hops through Windows, cleaning as we go,
Destructors now whisper what I/O can know,
Overlapped paths renewed, ConnectPipe set free,
Constants align—errno flows naturally! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1
❌ Failed checks (1 warning)
Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 58.33% 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 directly aligns with the main changes: fixing a segfault in _overlapped module and adding missing constants to _winapi module.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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@youknowone youknowone marked this pull request as ready for review January 30, 2026 21:34
@youknowone youknowone merged commit 050faa3 into RustPython:main Jan 30, 2026
11 of 13 checks passed
@youknowone youknowone deleted the winapi branch January 30, 2026 21:39
This was referenced Feb 4, 2026
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