521734787e
I/O safety. Introduce `OwnedFd` and `BorrowedFd`, and the `AsFd` trait, and implementations of `AsFd`, `From<OwnedFd>` and `From<T> for OwnedFd` for relevant types, along with Windows counterparts for handles and sockets. Tracking issue: <https://github.com/rust-lang/rust/issues/87074> RFC: <https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md> Highlights: - The doc comments at the top of library/std/src/os/unix/io/mod.rs and library/std/src/os/windows/io/mod.rs - The new types and traits in library/std/src/os/unix/io/fd.rs and library/std/src/os/windows/io/handle.rs - The removal of the `RawHandle` struct the Windows impl, which had the same name as the `RawHandle` type alias, and its functionality is now folded into `Handle`. Managing five levels of wrapping (File wraps sys::fs::File wraps sys::fs::FileDesc wraps OwnedFd wraps RawFd, etc.) made for a fair amount of churn and verbose as/into/from sequences in some places. I've managed to simplify some of them, but I'm open to ideas here. r? `@joshtriplett` |
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