Add O_ flag support

[newpavlov]

No description provided.

[RalfJung]

Thanks for the PR!

Please also add a test (pass-dep/libc/libc-fs.rs seems like the right place).

[RalfJung]

Please also add a test (pass-dep/libc/libc-fs.rs seems like the right place).

Specifically, that file can have a test where the file is not a symlink and we just check that the flag is supported.

The test where the file is a symlink should go into tests/pass-dep/libc/libc-fs-readlink.rs (which we should probably rename to libc-fs-symlinks); that file is skipped on Windows hosts since on Windows we can't create symlinks when we're not admins...

[rustbot]

There are merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

You can start a rebase with the following commands:

$ # rebase
$ git pull --rebase https://github.com/rust-lang/miri.git master
$ git push --force-with-lease

The following commits are merge commits:

• 185a772

[RalfJung]

Looks good, thanks. :)
@bors r+

[bors]

📌 Commit b7bbf7f has been approved by RalfJung

It is now in the queue for this repository.

[bors]

⌛ Testing commit b7bbf7f with merge b8753be...

[bors]

☀️ Test successful - checks-actions
Approved by: RalfJung
Pushing b8753be to master...