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 10 use crate::backend; 11 use 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")] cwd() -> BorrowedFd<'static>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