Add and rearrange a few fcntl pieces

[khuey]

Add f_owner_ex, F_GET/SETOWN_EX, F_GET/SETSIG, and move F_OWNER_* to the toplevel linux-like module because they're libc and platform agnostic.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @JohnTitor (or someone else) soon.

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[joshtriplett]

Closing and reopening to re-run CI.

[JohnTitor]

The definition itself looks good to me but we need to tweak the test to pass CI.

[JohnTitor]

We should add f_owner_ex here:

libc/libc-test/build.rs

Lines 2513 to 2522 in 0d37400

	// The following structs have a field called `type` in C,
	// but `type` is a Rust keyword, so these fields are translated
	// to `type_` in Rust.
	"type_"
	if struct_ == "input_event"
	|| struct_ == "input_mask"
	|| struct_ == "ff_effect" =>
	{
	"type".to_string()
	}

[bors]

☔ The latest upstream changes (presumably #2006) made this pull request unmergeable. Please resolve the merge conflicts.

[khuey]

I'm still not sure how to get this test to pass unfortunately. There appears to be something going wrong inside ctest, perhaps?

@JohnTitor

[JohnTitor]

Hey thanks for the ping and sorry for the long delay!
The problem here is that glibc uses a private enum for the type field thus CI issues it:
https://github.com/bminor/glibc/blob/21c3f4b5368686ade28d90d8c7d79c4c95c72c1b/sysdeps/unix/sysv/linux/bits/fcntl-linux.h#L263-L279

If it will work properly with c_int anyway, we could skip tests for the field and go ahead.

[bors]

☔ The latest upstream changes (presumably #2233) made this pull request unmergeable. Please resolve the merge conflicts.

[JohnTitor]

I'm going to close as inactive, feel free to rebase and re-open when you get some time :)