1b8a62b91Sopenharmony_ci//! The `cwd` function, representing the current working directory. 2b8a62b91Sopenharmony_ci//! 3b8a62b91Sopenharmony_ci//! # Safety 4b8a62b91Sopenharmony_ci//! 5b8a62b91Sopenharmony_ci//! This file uses `AT_FDCWD`, which is a raw file descriptor, but which is 6b8a62b91Sopenharmony_ci//! always valid. 7b8a62b91Sopenharmony_ci 8b8a62b91Sopenharmony_ci#![allow(unsafe_code)] 9b8a62b91Sopenharmony_ci 10b8a62b91Sopenharmony_ciuse crate::backend; 11b8a62b91Sopenharmony_ciuse backend::fd::{BorrowedFd, RawFd}; 12b8a62b91Sopenharmony_ci 13b8a62b91Sopenharmony_ci/// `AT_FDCWD`—Returns a handle representing the current working directory. 14b8a62b91Sopenharmony_ci/// 15b8a62b91Sopenharmony_ci/// This returns a file descriptor which refers to the process current 16b8a62b91Sopenharmony_ci/// directory which can be used as the directory argument in `*at` 17b8a62b91Sopenharmony_ci/// functions such as [`openat`]. 18b8a62b91Sopenharmony_ci/// 19b8a62b91Sopenharmony_ci/// # References 20b8a62b91Sopenharmony_ci/// - [POSIX] 21b8a62b91Sopenharmony_ci/// 22b8a62b91Sopenharmony_ci/// [`openat`]: crate::fs::openat 23b8a62b91Sopenharmony_ci/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html 24b8a62b91Sopenharmony_ci#[inline] 25b8a62b91Sopenharmony_ci#[doc(alias = "AT_FDCWD")] 26b8a62b91Sopenharmony_cipub const fn cwd() -> BorrowedFd<'static> { 27b8a62b91Sopenharmony_ci let at_fdcwd = backend::io::types::AT_FDCWD as RawFd; 28b8a62b91Sopenharmony_ci 29b8a62b91Sopenharmony_ci // Safety: `AT_FDCWD` is a reserved value that is never dynamically 30b8a62b91Sopenharmony_ci // allocated, so it'll remain valid for the duration of `'static`. 31b8a62b91Sopenharmony_ci unsafe { BorrowedFd::<'static>::borrow_raw(at_fdcwd) } 32b8a62b91Sopenharmony_ci} 33