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    use std::fs::{File, OpenOptions};
    use std::hash::{Hash, Hasher};
    use std::io;
    use std::os::unix::fs::MetadataExt;
    use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
    use std::path::Path;

    #[derive(Debug)]
    pub struct Handle {
        file: Option<File>,
        // If is_std is true, then we don't drop the corresponding File since it
        // will close the handle.
        is_std: bool,
        dev: u64,
        ino: u64,
    }

    impl Drop for Handle {
        fn drop(&mut self) {
            if self.is_std {
                // unwrap() will not panic. Since we were able to open an
                // std stream successfully, then `file` is guaranteed to be Some()
                self.file.take().unwrap().into_raw_fd();
            }
        }
    }

    impl Eq for Handle {}

    impl PartialEq for Handle {
        fn eq(&self, other: &Handle) -> bool {
            (self.dev, self.ino) == (other.dev, other.ino)
        }
    }

    impl AsRawFd for ::Handle {
        fn as_raw_fd(&self) -> RawFd {
            // unwrap() will not panic. Since we were able to open the
            // file successfully, then `file` is guaranteed to be Some()
            self.0.file.as_ref().take().unwrap().as_raw_fd()
        }
    }

    impl IntoRawFd for ::Handle {
        fn into_raw_fd(mut self) -> RawFd {
            // unwrap() will not panic. Since we were able to open the
            // file successfully, then `file` is guaranteed to be Some()
            self.0.file.take().unwrap().into_raw_fd()
        }
    }

    impl Hash for Handle {
        fn hash<H: Hasher>(&self, state: &mut H) {
            self.dev.hash(state);
            self.ino.hash(state);
        }
    }

    impl Handle {
        pub fn from_path<P: AsRef<Path>>(p: P) -> io::Result<Handle> {
            Handle::from_file(OpenOptions::new().read(true).open(p)?)
        }

        pub fn from_file(file: File) -> io::Result<Handle> {
            let md = file.metadata()?;
            Ok(Handle {
                file: Some(file),
                is_std: false,
                dev: md.dev(),
                ino: md.ino(),
            })
        }

        pub fn from_std(file: File) -> io::Result<Handle> {
            Handle::from_file(file).map(|mut h| {
                h.is_std = true;
                h
            })
        }

        pub fn stdin() -> io::Result<Handle> {
            Handle::from_std(unsafe { File::from_raw_fd(0) })
        }

        pub fn stdout() -> io::Result<Handle> {
            Handle::from_std(unsafe { File::from_raw_fd(1) })
        }

        pub fn stderr() -> io::Result<Handle> {
            Handle::from_std(unsafe { File::from_raw_fd(2) })
        }

        pub fn as_file(&self) -> &File {
            // unwrap() will not panic. Since we were able to open the
            // file successfully, then `file` is guaranteed to be Some()
            self.file.as_ref().take().unwrap()
        }

        pub fn as_file_mut(&mut self) -> &mut File {
            // unwrap() will not panic. Since we were able to open the
            // file successfully, then `file` is guaranteed to be Some()
            self.file.as_mut().take().unwrap()
        }

        pub fn dev(&self) -> u64 {
            self.dev
        }

        pub fn ino(&self) -> u64 {
            self.ino
        }
    }

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