bitflags! {
    pub struct AdjustFlags: u32 {
        /// Add buf.time to the current time. If buf.status includes the ADJ_NANO flag, then buf.time.tv_usec is interpreted as a nanosecond value;
        /// otherwise it is interpreted as microseconds.
        ///
        /// The value of buf.time is the sum of its two fields, but the field buf.time.tv_usec must always be nonnegative.
        /// The following example shows how to normalize a timeval with nanosecond resolution.
        ///
        /// ```C
        /// while (buf.time.tv_usec < 0) {
        ///     buf.time.tv_sec  -= 1;
        ///     buf.time.tv_usec += 1000000000;
        /// }
        /// ```
        const SETOFFSET = libc::ADJ_SETOFFSET;
    }
}