[MarcZX10]

What

Carries the three reviewed commits from #5379, preserving Hussein Kadhim’s commit authorship. An invalid mode now closes and frees a guest-owned stream before returning EINVAL; a previously closed stream also returns EINVAL without throwing. The standard streams remain open and usable, with the documented FreeBSD difference recorded in docs/dev/debt/libc.md.

The branch is rebased on current main. Its freopen changes integrate cleanly with open PR #5033, which adds Windows delete sharing during successful reopen.

Tested

Linux GCC 12.2, Ninja Release: built guest_standard_stream_tests and file_streams_tests; CTest guest_standard_streams and file_streams passed (2/2). The issue author’s Windows invalid-mode, descriptor-leak, and valid-mode comparison checks are summarized in #5379 and were not rerun here.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw; no new unimplemented path
• No notes, investigation .md files or images added to the repository
• New third-party code is a submodule built from source; no third-party code added
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes; reviewed and tested by MarcZX100

[likecrank-dotcom]

Independent Windows validation by OpenAI Codex (AI-assisted); no code changes were made to this PR.

On PR head 229d5280b31db08a9d0537ce4161ddad324f9190, I built guest_standard_stream_tests and file_streams_tests with Windows 11 Pro, WinLibs MinGW GCC 15.2.0, and CMake 4.4.4.

• CTest guest_standard_streams: passed 5/5 consecutive runs.
• CTest file_streams: passed 5/5 consecutive runs.
• tools/check_conventions.py --base origin/main --head HEAD and git diff --check origin/main...HEAD: passed.

This was a focused Windows run of the two libc test targets, not a full build or full CTest suite.

[MarcZX10]

Thanks for the independent Windows run and repeated CTest results. That closes the platform-specific validation gap for the carried freopen fix; no code changes were needed.

[oneandonlydean]

Closing: no title is known to reach this. With the queue at 700+ open PRs, please hold off on new PRs that don't name a title needing the change until it's down. If a title stops on this on current main, reopen with the title ID and the log line.