NetBSD: add kinfo_file, kinfo_pcb structures and related constants

[antoncxx]

Description

This PR extends NetBSD support with updates to kernel information structures and file descriptor types.

1. Added kinfo_pcb

• Constants:
  • PCB_SLOP
  • PCB_ALL

2. kinfo_file structure

• Contants
  • KERN_FILE_BYFILE
  • KERN_FILE_BYPID
  • KERN_FILESLOP

3. File descriptor types

• DTYPE_VNODE
• DTYPE_SOCKET
• DTYPE_PIPE
• DTYPE_MISC
• DTYPE_CRYPTO
• DTYPE_MQUEUE
• DTYPE_SEM
• DTYPE_EVENTFD
• DTYPE_TIMERFD

Sources

• kinfo_pcb
• kinfo_file
• descriptors

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

@rustbot label +stable-nominated

---

Of all the file descriptor types, I’ve been having trouble with DTYPE_MEMFD. Even though it exists in the NetBSD source code, the corresponding header on an actual installation seems to be missing this definition. I’m not sure how to handle this properly—whether to ignore it during tests or not include it at all.

[rustbot]

Some changes occurred in a NetBSD-like module

cc @semarie

[semarie]

Some changes occurred in a NetBSD-like module

cc @semarie

just to note that the PR is properly rebased to NetBSD only 👍

[tgross35]

The structs themselves look pretty fine, but a lot of the support bits can be dropped.

Also, please give PRs a more descriptive title. We get a lot of additions to NetBSD API and it is helpful to be able to narrow them down :)

View changes since this review

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[tgross35]

Think the two things here should fix it. Please rebase & squash after then LGTM, assuming CI passes

View changes since this review

[rustbot]

Some changes occurred in an OpenBSD module

cc @semarie

[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.

[tgross35]

Thank you!

View changes since this review

[antoncxx]

Thank you!

View changes since this review

Thank you for the review!