Guide Rust code to use bun_sys for cross-platform file I/O and system calls.
npx skills add https://github.com/oven-sh/bun --skill rust-system-calls
Please help me install this Agent Skill. Skill: rust-system-calls Source: https://github.com/oven-sh/bun/tree/main/.claude/skills/rust-system-calls Command: npx skills add https://github.com/oven-sh/bun --skill rust-system-calls
Writing cross-platform file I/O in Bun's Rust codebase is error-prone when using std::fs or raw libc, leading to lossy errors, missing Windows support, and manual EINTR handling. This Skill enforces a consistent syscall layer.
?, and avoid double-close pitfalls.Implement file I/O in Bun's Rust code using bun_sys::File with openat and propagate errors via Maybe<T> instead of std::fs.
High-intent search queries and answers about installing and using this skill.
Use bun_sys::File::openat(Fd::cwd(), path, O::RDONLY, 0) instead of std::fs::File::open. The File wrapper owns the fd, closes on Drop, and returns Maybe<T> with errno, syscall tag, and path attached to errors.
bun_sys returns Maybe<T> with rich Error metadata including errno and syscall tag, supports Windows via libuv fallback, retries on EINTR automatically, and accepts &[u8] WTF-8 paths. std::fs returns lossy io::Error and lacks full Windows coverage.
Yes, bun_sys provides full Windows support through a libuv fallback layer. Use path_buffer_pool::get() to avoid 64 KB stack allocations that occur with PathBuffer on Windows hot paths.
std::fs::File loses the syscall tag and path needed to construct Node-compatible error objects. It also lacks automatic EINTR retry and produces lossy io::Error values that cannot be cleanly converted to JS exceptions.
Use bun_sys_jsc::ErrorJsc::to_js on a bun_sys::Error to produce a JS exception. Match on the Result from File::openat and return err.to_js(global)? to propagate the error with errno and path preserved.
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