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Implement read_buf for TcpStream, Stdin, StdinLock, ChildStdout,
ChildStderr (and internally for AnonPipe, Handle, Socket), so
that it skips buffer initialization.
The other provided methods like read_to_string and read_to_end are
implemented in terms of read_buf and so benefit from the optimization
as well.
This commit also implements read_vectored and is_read_vectored where
applicable.
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Implement stabilization of [I/O safety], aka `#[feature(io_safety)]`.
Fixes #87074.
[I/O safety]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
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Also, rename `BorrowedHandle::borrow_raw_handle` and
`BorrowedSocket::borrow_raw_socket` to `BorrowedHandle::borrow_raw` and
`BorrowedSocket::borrow_raw`.
This is just a minor rename to reduce redundancy in the user code calling
these functions, and to eliminate an inessential difference between
`BorrowedFd` code and `BorrowedHandle`/`BorrowedSocket` code.
While here, add a simple test exercising `BorrowedFd::borrow_raw_fd`.
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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>
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Raw standard streams constructors are infallible. Remove unnecessary
result type.
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