[libc-commits] [libc] [libc] implement ioctl (PR #85890)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Also, it's still not clear to me how presubmit [appears to have run successfully](https://buildkite.com/llvm-project/github-pull-requests/builds/51151#018e8278-df6a-46a2-8899-d4b81a890a22/481).  That's...concerning...

https://github.com/llvm/llvm-project/pull/85890