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