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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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This issue was found by the Wine project and mitigated there [1].
Windows' documented interface for `setsockopt` expects a `BOOL` (a
`typedef` for `int`) for `TCP_NODELAY` [2]. Windows is forgiving and
will accept any positive length and interpret the first byte of
`*option_value` as the value, so this bug does not affect Windows
itself, but does affect systems implementing Windows' interface more
strictly, such as Wine. Wine was previously passing this through to the
host's `setsockopt`, where, e.g., Linux requires that `option_len` be
correct for the chosen option, and `TCP_NODELAY` expects an `int`.
[1]: https://source.winehq.org/git/wine.git/commit/d6ea38f32dfd3edbe107a255c37e9f7f3da06ae7
[2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-setsockopt
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Add a `try_clone()` function to `OwnedFd`.
As suggested in #88564. This adds a `try_clone()` to `OwnedFd` by
refactoring the code out of the existing `File`/`Socket` code.
r? ``@joshtriplett``
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On MinGW toolchains the various features (such as function sections)
necessary to eliminate dead function references are disabled due to
various bugs. This means that the windows sockets library will most
likely remain linked to any mingw toolchain built program that also
utilizes libstd.
That said, I made an attempt to also enable `function-sections` and
`--gc-sections` during my experiments, but the symbol references
remained, sadly.
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As suggested in #88564. This adds a `try_clone()` to `OwnedFd` by
refactoring the code out of the existing `File`/`Socket` code.
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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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