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    use std::{
        ops::Deref,
        os::unix::io::{
            AsRawFd,
            FromRawFd,
            IntoRawFd,
            RawFd,
        },
        sync::atomic::{
            AtomicBool,
            Ordering,
        },
    };

    use inotify_sys as ffi;

    /// A RAII guard around a `RawFd` that closes it automatically on drop.
    #[derive(Debug)]
    pub struct FdGuard {
        pub(crate) fd           : RawFd,
        pub(crate) close_on_drop: AtomicBool,
    }

    impl FdGuard {

        /// Indicate that the wrapped file descriptor should _not_ be closed
        /// when the guard is dropped.
        ///
        /// This should be called in cases where ownership of the wrapped file
        /// descriptor has been "moved" out of the guard.
        ///
        /// This is factored out into a separate function to ensure that it's
        /// always used consistently.
        #[inline]
        pub fn should_not_close(&self) {
            self.close_on_drop.store(false, Ordering::Release);
        }
    }

    impl Deref for FdGuard {
        type Target = RawFd;

        #[inline]
        fn deref(&self) -> &Self::Target {
            &self.fd
        }
    }

    impl Drop for FdGuard {
        fn drop(&mut self) {
            if self.close_on_drop.load(Ordering::Acquire) {
                unsafe { ffi::close(self.fd); }
            }
        }
    }

    impl FromRawFd for FdGuard {
        unsafe fn from_raw_fd(fd: RawFd) -> Self {
            FdGuard {
                fd,
                close_on_drop: AtomicBool::new(true),
            }
        }
    }

    impl IntoRawFd for FdGuard {
        fn into_raw_fd(self) -> RawFd {
            self.should_not_close();
            self.fd
        }
    }

    impl AsRawFd for FdGuard {
        fn as_raw_fd(&self) -> RawFd {
            self.fd
        }
    }

    impl PartialEq for FdGuard {
        fn eq(&self, other: &FdGuard) -> bool {
            self.fd == other.fd
        }
    }

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