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//! The unsafe `close` for raw file descriptors.
//!
//! # Safety
//!
//! Operating on raw file descriptors is unsafe.
#![allow(unsafe_code)]
use crate::backend;
use backend::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.
///
///
/// # References
/// - [Beej's Guide to Network Programming]
/// - [POSIX]
/// - [Linux]
/// - [Apple]
/// - [Winsock]
/// - [FreeBSD]
/// - [NetBSD]
/// - [OpenBSD]
/// - [DragonFly BSD]
/// - [illumos]
/// - [glibc]
///
/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#close-and-shutdownget-outta-my-face
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Opening-and-Closing-Files.html#index-close
///
/// # 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) {
backend::io::syscalls::close(raw_fd)
}