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+//! The unsafe `close` for raw file descriptors.
+//!
+//! # Safety
+//!
+//! Operating on raw file descriptors is unsafe.
+#![allow(unsafe_code)]
+
+use crate::imp;
+use imp::fd::RawFd;
+
+/// `close(raw_fd)`—Closes a `RawFd` directly.
+///
+/// Most users won't need to use this, as `OwnedFd` automatically closes its
+/// file descriptor on `Drop`.
+///
+/// This function does not return a `Result`, as it is the [responsibility] of
+/// filesystem designers to not return errors from `close`. Users who chose to
+/// use NFS or similar filesystems should take care to monitor for problems
+/// externally.
+///
+/// [responsibility]: https://lwn.net/Articles/576518/
+///
+/// # References
+/// - [POSIX]
+/// - [Linux]
+/// - [Apple]
+/// - [Winsock2]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/close.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/close.2.html#//apple_ref/doc/man/2/close
+/// [Winsock2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-closesocket
+///
+/// # Safety
+///
+/// This function takes a `RawFd`, which must be valid before the call, and is
+/// not valid after the call.
+#[inline]
+pub unsafe fn close(raw_fd: RawFd) {
+ imp::io::syscalls::close(raw_fd)
+}