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bitflags::bitflags! {
    /// Various options that were employed when mounting this filesystem (see `statvfs(3)`).
    ///
    /// See [UsageExt::flags] method, which returns that structure.
    pub struct Flags: libc::c_ulong {
        /// Mandatory locking is permitted on the filesystem (see `fcntl(2)`).
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const MANDLOCK = libc::ST_MANDLOCK;

        /// Do not update access times; see `mount(2)`.
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const NOATIME = libc::ST_NOATIME;

        /// Disallow access to device special files on this filesystem.
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const NODEV = libc::ST_NODEV;

        /// Do not update directory access times; see `mount(2)`.
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const NODIRATIME = libc::ST_NODIRATIME;

        /// Execution of programs is disallowed on this filesystem.
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const NOEXEC = libc::ST_NOEXEC;

        /// The set-user-ID and set-group-ID bits are ignored by `exec(3)`
        /// for executable files on this filesystem.
        const NOSUID = libc::ST_NOSUID;

        /// This filesystem is mounted read-only.
        const RDONLY = libc::ST_RDONLY;

        /// Update `atime` relative to `mtime`/`ctime`; see `mount(2)`.
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS or any `musl` target environment.
        #[cfg(not(any(target_os = "macos", target_env = "musl")))]
        const RELATIME = libc::ST_RELATIME;

        /// Writes are synced to the filesystem immediately
        /// (see the description of `O_SYNC` in `open(2)`).
        ///
        /// ## Compatibility
        ///
        /// Not available for macOS.
        #[cfg(not(target_os = "macos"))]
        const SYNCHRONOUS = libc::ST_SYNCHRONOUS;
    }
}

/// Unix-specific extensions for [Usage] struct.
///
/// [Usage]: ../../struct.Usage.html
pub trait UsageExt {
    /// Returns [Flags] for current filesystem;
    fn flags(&self) -> Flags;
}

#[cfg(unix)]
impl UsageExt for crate::Usage {
    fn flags(&self) -> Flags {
        self.as_ref().flags()
    }
}