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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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Add `read_to_end` method for `sys::{target}::pipe::AnonPipe`. This allows
having a more optimized version of `read_to_end` for ChildStdout.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
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Signed-off-by: Alex Saveau <saveau.alexandre@gmail.com>
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This reverts commit ddb7fbe8434be481607ae199fe2aee976ee2fc2e, reversing
changes made to baaa3b682986879c7784b5733ecea942e9ae7de3.
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Stdin pipes do not need to be used asynchronously within the standard library.
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Windows: Use a pipe relay for chaining pipes
Fixes #95759
This fixes the issue by chaining pipes synchronously and manually pumping messages between them. It's not ideal but it has the advantage of not costing anything if pipes are not chained ("don't pay for what you don't use") and it also avoids breaking existing code that rely on our end of the pipe being asynchronous (which includes rustc's own testing framework).
Libraries can avoid needing this by using their own pipes to chain commands.
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This brings it inline with typical Linux defaults: https://www.man7.org/linux/man-pages/man7/pipe.7.html
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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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