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## Summary - Adds birthtime (file creation time) support on Linux using the `statx` syscall - Stores birthtime in architecture-specific unused fields of the kernel Stat struct (x86_64 and aarch64) - Falls back to traditional `stat` on kernels < 4.11 that don't support `statx` - Includes comprehensive tests validating birthtime behavior Fixes #6585 ## Implementation Details **src/sys.zig:** - Added `StatxField` enum for field selection - Implemented `statxImpl()`, `fstatx()`, `statx()`, and `lstatx()` functions - Stores birthtime in unused padding fields (architecture-specific for x86_64 and aarch64) - Graceful fallback to traditional stat if statx is not supported **src/bun.js/node/node_fs.zig:** - Updated `stat()`, `fstat()`, and `lstat()` to use statx functions on Linux **src/bun.js/node/Stat.zig:** - Added `getBirthtime()` helper to extract birthtime from architecture-specific storage **test/js/node/fs/fs-birthtime-linux.test.ts:** - Tests non-zero birthtime values - Verifies birthtime immutability across file modifications - Validates consistency across stat/lstat/fstat - Tests BigInt stats with nanosecond precision - Verifies birthtime ordering relative to other timestamps ## Test Plan - [x] Run `bun bd test test/js/node/fs/fs-birthtime-linux.test.ts` - all 5 tests pass - [x] Compare behavior with Node.js - identical behavior - [x] Compare with system Bun - system Bun returns epoch, new implementation returns real birthtime 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>