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Add `read_buf` equivalents for positioned reads
Adds the following items under the ~~`read_buf` (rust-lang/rust#78485)~~ `read_buf_at` (rust-lang/rust#140771) feature:
- `std::os::unix::fs::FileExt::read_buf_at`
- `std::os::unix::fs::FileExt::read_buf_exact_at`
- `std::os::windows::fs::FileExt::seek_read_buf`
try-job: `x86_64-msvc*`
try-job: `test-various*`
try-job: `dist-various*`
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Adds the following items under the `read_buf_at` feature:
- `std::os::unix::fs::FileExt::read_buf_at`
- `std::os::unix::fs::FileExt::read_buf_exact_at`
- `std::os::windows::fs::FileExt::seek_read_buf`
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Previously, attempting to create/truncate a file without write/append access
would result in platform-specific error messages:
- Unix: "Invalid argument"
- Windows: raw OS error code 87
These error codes look like system errors, which could waste hours
of debugging for what is actually an API misuse issue.
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The `security_attributes` function is marked as safe despite taking a raw pointer which will later be used. Fortunately this function is only used internally and only in one place that has been basically the same for a decade now.
However, we only ever set one bool so it's easy enough to replace with something that's actually safe.
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It uses the file metadata on Unix with a fallback for files incorrectly
reported as zero-sized. It uses `GetFileSizeEx` on Windows.
This reduces the number of syscalls needed for determining the file size
of an open file from 3 to 1.
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try_lock() and try_lock_shared() do not need to handle these per the discussion in https://github.com/rust-lang/rust/pull/140718#discussion_r2076678485
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Change signature of File::try_lock and File::try_lock_shared
These methods now return Result<(), TryLockError> instead of Result<bool, Error> to make their use less errorprone
These methods are unstable under the "file_lock" feature. The related tracking issue is https://github.com/rust-lang/rust/pull/130999 and this PR changes the signatures as discussed by libs-api: https://github.com/rust-lang/rust/issues/130994#issuecomment-2770838848
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These methods now return Result<(), TryLockError> instead of
Result<bool, Error> to make their use less errorprone
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Also add a WCStr type
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