Add `read_buf` equivalents for positioned reads #140459

niklasf · 2025-04-29T13:54:42Z

Adds the following items under the ~~read_buf (#78485)~~ read_buf_at (#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*

rustbot · 2025-04-29T13:54:54Z

rustbot has assigned @tgross35.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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tgross35 · 2025-05-01T00:54:44Z

Have these changes been discussed with libs-api at all? Usually changes to unstable API need to be proposed at https://github.com/rust-lang/libs-team/ with the ACP issue template.

This needs some tests as well.

tgross35 · 2025-05-01T01:42:49Z

For the above,
@rustbot author

rustbot · 2025-05-01T01:42:54Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

Kivooeo · 2025-05-08T04:28:04Z

For consistency and clarity, could we include safety comments on each unsafe block? Even brief notes are helpful to understand the assumptions being made

niklasf · 2025-05-12T23:13:31Z

Thank you both.

Opened an APC that was accepted, but items to be added under a new feature instead of read_buf. Moved to read_buf_at with new tracking issue Tracking Issue for read_buf_at #140771.
Added safety comments also for FFI calls.
Added tests.

@rustbot ready

library/std/src/sys/fd/unix.rs

library/std/src/os/unix/fs.rs

library/std/src/sys/fd/unix.rs

tgross35 · 2025-05-28T22:38:03Z

@bors try

Add `read_buf` equivalents for positioned reads Adds the following items under the ~~`read_buf` (#78485)~~ `read_buf_at` (#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-1 try-job: x86_64-msvc-2

tgross35

Thanks for the updates, two small nits then r=me

View changes since this review

library/std/src/sys/fd/unix.rs

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`

niklasf · 2025-09-03T18:51:39Z

@rustbot ready

tgross35 · 2025-09-03T18:55:11Z

Going to rerun the try job just in case, but LGTM. Thanks for the updates

@bors2 try

Add `read_buf` equivalents for positioned reads try-job: `x86_64-msvc*` try-job: `test-various*` try-job: `dist-various*`

rust-bors · 2025-09-03T21:28:59Z

☀️ Try build successful (CI)
Build commit: f0baf1c (f0baf1cd9fa552c3e2ab50b1610b11ce86350ef2, parent: fd75a9c32d643f39c8c61df770d2cff60b3fefd5)

tgross35 · 2025-09-03T21:34:10Z

@bors r+

bors · 2025-09-03T21:34:13Z

📌 Commit c914c47 has been approved by tgross35

It is now in the queue for this repository.

…oss35 Add `read_buf` equivalents for positioned reads Adds the following items under the ~~`read_buf` (rust-lang#78485)~~ `read_buf_at` (rust-lang#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*`

Rollup of 24 pull requests Successful merges: - #140459 (Add `read_buf` equivalents for positioned reads) - #143725 (core: add Peekable::next_if_map) - #145209 (Stabilize `path_add_extension`) - #145342 (fix drop scope for `super let` bindings within `if let`) - #145750 (raw_vec.rs: Remove superfluous fn alloc_guard) - #145827 (On unused binding or binding not present in all patterns, suggest potential typo of unit struct/variant or const) - #145932 (Allow `inline(always)` with a target feature behind a unstable feature `target_feature_inline_always`.) - #145962 (Ensure we emit an allocator shim when only some crate types need one) - #145963 (Add LSX accelerated implementation for source file analysis) - #146054 (add `#[must_use]` to `array::repeat`) - #146090 (Derive `PartialEq` for `InvisibleOrigin`) - #146112 (don't uppercase error messages) - #146120 (Correct typo in `rustc_errors` comment) - #146124 (Test `rustc-dev` in `distcheck`) - #146127 (Rename `ToolRustc` to `ToolRustcPrivate`) - #146131 (rustdoc-search: add test case for indexing every item type) - #146134 (llvm: nvptx: Layout update to match LLVM) - #146136 (docs(std): add missing closing code block fences in doc comments) - #146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments) - #146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries) - #146150 (fix(rustdoc): match rustc `--emit` precedence ) - #146155 (Make bootstrap self test parallel) - #146161 ([rustdoc] Uncomment code to add scraped rustdoc examples in loaded paths) - #146172 (triagebot: configure some pings when certain attributes are used) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #140459 - niklasf:feature/read-buf-at, r=tgross35 Add `read_buf` equivalents for positioned reads Adds the following items under the ~~`read_buf` (#78485)~~ `read_buf_at` (#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*`

Rollup of 24 pull requests Successful merges: - rust-lang/rust#140459 (Add `read_buf` equivalents for positioned reads) - rust-lang/rust#143725 (core: add Peekable::next_if_map) - rust-lang/rust#145209 (Stabilize `path_add_extension`) - rust-lang/rust#145342 (fix drop scope for `super let` bindings within `if let`) - rust-lang/rust#145750 (raw_vec.rs: Remove superfluous fn alloc_guard) - rust-lang/rust#145827 (On unused binding or binding not present in all patterns, suggest potential typo of unit struct/variant or const) - rust-lang/rust#145932 (Allow `inline(always)` with a target feature behind a unstable feature `target_feature_inline_always`.) - rust-lang/rust#145962 (Ensure we emit an allocator shim when only some crate types need one) - rust-lang/rust#145963 (Add LSX accelerated implementation for source file analysis) - rust-lang/rust#146054 (add `#[must_use]` to `array::repeat`) - rust-lang/rust#146090 (Derive `PartialEq` for `InvisibleOrigin`) - rust-lang/rust#146112 (don't uppercase error messages) - rust-lang/rust#146120 (Correct typo in `rustc_errors` comment) - rust-lang/rust#146124 (Test `rustc-dev` in `distcheck`) - rust-lang/rust#146127 (Rename `ToolRustc` to `ToolRustcPrivate`) - rust-lang/rust#146131 (rustdoc-search: add test case for indexing every item type) - rust-lang/rust#146134 (llvm: nvptx: Layout update to match LLVM) - rust-lang/rust#146136 (docs(std): add missing closing code block fences in doc comments) - rust-lang/rust#146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments) - rust-lang/rust#146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries) - rust-lang/rust#146150 (fix(rustdoc): match rustc `--emit` precedence ) - rust-lang/rust#146155 (Make bootstrap self test parallel) - rust-lang/rust#146161 ([rustdoc] Uncomment code to add scraped rustdoc examples in loaded paths) - rust-lang/rust#146172 (triagebot: configure some pings when certain attributes are used) r? `@ghost` `@rustbot` modify labels: rollup

…oss35 Add `read_buf` equivalents for positioned reads Adds the following items under the ~~`read_buf` (rust-lang#78485)~~ `read_buf_at` (rust-lang#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*`

Rollup of 24 pull requests Successful merges: - rust-lang#140459 (Add `read_buf` equivalents for positioned reads) - rust-lang#143725 (core: add Peekable::next_if_map) - rust-lang#145209 (Stabilize `path_add_extension`) - rust-lang#145342 (fix drop scope for `super let` bindings within `if let`) - rust-lang#145750 (raw_vec.rs: Remove superfluous fn alloc_guard) - rust-lang#145827 (On unused binding or binding not present in all patterns, suggest potential typo of unit struct/variant or const) - rust-lang#145932 (Allow `inline(always)` with a target feature behind a unstable feature `target_feature_inline_always`.) - rust-lang#145962 (Ensure we emit an allocator shim when only some crate types need one) - rust-lang#145963 (Add LSX accelerated implementation for source file analysis) - rust-lang#146054 (add `#[must_use]` to `array::repeat`) - rust-lang#146090 (Derive `PartialEq` for `InvisibleOrigin`) - rust-lang#146112 (don't uppercase error messages) - rust-lang#146120 (Correct typo in `rustc_errors` comment) - rust-lang#146124 (Test `rustc-dev` in `distcheck`) - rust-lang#146127 (Rename `ToolRustc` to `ToolRustcPrivate`) - rust-lang#146131 (rustdoc-search: add test case for indexing every item type) - rust-lang#146134 (llvm: nvptx: Layout update to match LLVM) - rust-lang#146136 (docs(std): add missing closing code block fences in doc comments) - rust-lang#146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments) - rust-lang#146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries) - rust-lang#146150 (fix(rustdoc): match rustc `--emit` precedence ) - rust-lang#146155 (Make bootstrap self test parallel) - rust-lang#146161 ([rustdoc] Uncomment code to add scraped rustdoc examples in loaded paths) - rust-lang#146172 (triagebot: configure some pings when certain attributes are used) r? `@ghost` `@rustbot` modify labels: rollup

rustbot assigned tgross35 Apr 29, 2025

rustbot added O-unix Operating system: Unix-like O-windows Operating system: Windows S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 29, 2025

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niklasf closed this Apr 29, 2025

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niklasf mentioned this pull request May 7, 2025

Tracking Issue for read_buf_at #140771

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niklasf force-pushed the feature/read-buf-at branch from bf491a1 to 60c69e1 Compare September 3, 2025 18:29

Add read_buf equivalents for positioned reads

c914c47

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`

niklasf force-pushed the feature/read-buf-at branch from 60c69e1 to c914c47 Compare September 3, 2025 18:43

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rust-bors bot added a commit that referenced this pull request Sep 3, 2025

Auto merge of #140459 - niklasf:feature/read-buf-at, r=<try>

f0baf1c

Add `read_buf` equivalents for positioned reads try-job: `x86_64-msvc*` try-job: `test-various*` try-job: `dist-various*`

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Zalathar mentioned this pull request Sep 4, 2025

Rollup of 24 pull requests #146185

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bors merged commit f073f64 into rust-lang:master Sep 4, 2025
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rustbot added this to the 1.91.0 milestone Sep 4, 2025

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Add `read_buf` equivalents for positioned reads #140459

Add `read_buf` equivalents for positioned reads #140459

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