dirfd file operations (2/4)

[Qelxiros]

Previous PR: #146341
Reference: #139514
Tracking issue: #120426

[rustbot]

r? @tgross35

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[Qelxiros]

This is going to need a try run for windows at least. @tgross35 I'll let you decide which jobs make the most sense here.

[tgross35]

@bors2 try jobs=x86_64-msvc-*

Cc @the8472 for dirfd, and @ChrisDenton for Windows

[rust-bors]

☀️ Try build successful (CI)
Build commit: 796e04e (796e04e9c306cfa50aa215b1e93ebdb1cbdc51d8, parent: e29fcf45e4ae686d77b490bf07320f0d3a2cf35f)

[tgross35]

I haven't had a chance to look here yet, sorry

@rustbot reroll

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rust-bors]

☔ The latest upstream changes (presumably #151716) made this pull request unmergeable. Please resolve the merge conflicts.