bsd: Add missing minherit system call

[oherrala]

Description

Add a missing minherit() system call and constants related to it.

minherit(2) from macOS describes this call as:

The minherit() system call changes the specified pages to have the inheritance characteristic inherit, which can be set to VM_INHERIT_NONE, VM_INHERIT_COPY, or VM_INHERIT_SHARE. Not all implementations will guarantee that the inheritance characteristic can be set on a page basis; the granularity of changes may be as large as an entire region.

Sources

https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/bsd/sys/mman.h#L290

https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/osfmk/mach/vm_inherit.h#L85-L88

• OpenBSD: https://github.com/openbsd/src/blob/master/sys/sys/mman.h#L111-L117

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

[oherrala]

The arm-linux-androidabi test failed maybe because "The job has exceeded the maximum execution time of 25m0s".

[tgross35]

Would you be able to use mach2 instead? https://docs.rs/mach2/latest/mach2/vm_inherit/index.html. We're tryig to transition away from binding platform API like mach/ and linux/.

[rustbot]

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

[oherrala]

@tgross35 FWIW minherit is not macOS specific. It originates from OpenBSD and is also in FreeBSD, NetBSD and DragonFly:

• https://man.openbsd.org/minherit
• https://man.netbsd.org/minherit.2
• https://man.freebsd.org/cgi/man.cgi?query=minherit
• https://man.bsd.lv/DragonFly-5.6.1/minherit.2

[tgross35]

Thanks for the links. In that case I think it’s fine here, but would you mind enabling it for those other platforms as well? At least FreeBSD and NetBSD get CI here.