[all-commits] [llvm/llvm-project] 24cc35: [libc] Implement fstatat in sys/stat (#224334)

[Aman Maurya via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 24cc35cc98486cc156170505ff1952d54713374f
      https://github.com/llvm/llvm-project/commit/24cc35cc98486cc156170505ff1952d54713374f
  Author: Aman Maurya <amanmaurya9209 at gmail.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M libc/config/linux/aarch64/entrypoints.txt
    M libc/config/linux/riscv/entrypoints.txt
    M libc/config/linux/x86_64/entrypoints.txt
    M libc/include/sys/stat.yaml
    M libc/src/sys/stat/CMakeLists.txt
    A libc/src/sys/stat/fstatat.h
    M libc/src/sys/stat/linux/CMakeLists.txt
    A libc/src/sys/stat/linux/fstatat.cpp
    M libc/test/src/sys/stat/CMakeLists.txt
    A libc/test/src/sys/stat/fstatat_test.cpp

  Log Message:
  -----------
  [libc] Implement fstatat in sys/stat (#224334)

### Summary
Implement the standard POSIX.1-2008 function `fstatat` in
`<sys/stat.h>`.

Fixes #224327

### Changes
- Added `fstatat` function specification to
`libc/include/sys/stat.yaml`.
- Added internal header `libc/src/sys/stat/fstatat.h`.
- Implemented `fstatat` in `libc/src/sys/stat/linux/fstatat.cpp` using
the existing `internal::stat_via_statx`.
- Registered `fstatat` entrypoint in `libc/src/sys/stat/CMakeLists.txt`
and `libc/src/sys/stat/linux/CMakeLists.txt`.
- Added entrypoint across Linux targets (`x86_64`, `aarch64`, `riscv`).
- Added hermetic unit tests in
`libc/test/src/sys/stat/fstatat_test.cpp`.

### Testing
- Built and passed hermetic unit test
`libc.test.src.sys.stat.fstatat_test` (5/5 tests passed).
- Verified stat-family suite (`stat_test`, `lstat_test`, `fstat_test`,
`fstatat_test`).
- Ran `generate-libc-headers` and verified generated `sys/stat.h`.
- Verified `docgen.py` output marks `fstatat` as implemented.
- Ran `clang-format` on all touched C++ files.

---------

Co-authored-by: Pavel Labath <pavel at labath.sk>



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