| //! The `cwd` function, representing the current working directory. |
| //! |
| //! # Safety |
| //! |
| //! This file uses `AT_FDCWD`, which is a raw file descriptor, but which is |
| //! always valid. |
| |
| #![allow(unsafe_code)] |
| |
| use crate::backend; |
| use backend::fd::{BorrowedFd, RawFd}; |
| |
| /// `AT_FDCWD`—Returns a handle representing the current working directory. |
| /// |
| /// This returns a file descriptor which refers to the process current |
| /// directory which can be used as the directory argument in `*at` |
| /// functions such as [`openat`]. |
| /// |
| /// # References |
| /// - [POSIX] |
| /// |
| /// [`openat`]: crate::fs::openat |
| /// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html |
| #[inline] |
| #[doc(alias = "AT_FDCWD")] |
| pub const fn cwd() -> BorrowedFd<'static> { |
| let at_fdcwd = backend::io::types::AT_FDCWD as RawFd; |
| |
| // SAFETY: `AT_FDCWD` is a reserved value that is never dynamically |
| // allocated, so it'll remain valid for the duration of `'static`. |
| unsafe { BorrowedFd::<'static>::borrow_raw(at_fdcwd) } |
| } |
