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::c; 12 use backend::fd::{BorrowedFd, RawFd}; 13 14 /// `AT_FDCWD`—A handle representing the current working directory. 15 /// 16 /// This is a file descriptor which refers to the process current directory 17 /// which can be used as the directory argument in `*at` functions such as 18 /// [`openat`]. 19 /// 20 /// # References 21 /// - [POSIX] 22 /// 23 /// [`openat`]: crate::fs::openat 24 /// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html 25 // SAFETY: `AT_FDCWD` is a reserved value that is never dynamically 26 // allocated, so it'll remain valid for the duration of `'static`. 27 #[doc(alias = "AT_FDCWD")] 28 pub const CWD: BorrowedFd<'static> = 29 unsafe { BorrowedFd::<'static>::borrow_raw(c::AT_FDCWD as RawFd) }; 30 31 /// Return the value of [`CWD`]. 32 #[deprecated(note = "Use `CWD` in place of `cwd()`.")] cwd() -> BorrowedFd<'static>33pub const fn cwd() -> BorrowedFd<'static> { 34 let at_fdcwd = c::AT_FDCWD as RawFd; 35 36 // SAFETY: `AT_FDCWD` is a reserved value that is never dynamically 37 // allocated, so it'll remain valid for the duration of `'static`. 38 unsafe { BorrowedFd::<'static>::borrow_raw(at_fdcwd) } 39 } 40