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//! This crate contains the system clock interfaces for ntpd-rs and is not intended
//! as a public interface at this time. It follows the same version as the main
//! ntpd-rs crate, but that version is not intended to give any stability guarantee.
//! Use at your own risk.
//!
//! Please visit the [ntpd-rs](https://github.com/pendulum-project/ntpd-rs) project
//! for more information.

mod unix;

#[cfg(unix)]
pub type DefaultNtpClock = unix::UnixNtpClock;

#[derive(Debug, Copy, Clone, thiserror::Error)]
pub enum Error {
    #[error("Insufficient permissions to interact with the clock.")]
    NoPermission,
    #[error("Invalid operation requested")]
    Invalid,
    #[error("Clock device has gone away")]
    NoDev,
    #[error("Clock operation requested is not supported by operating system.")]
    NotSupported,
    #[error("Invalid clock path")]
    InvalidClockPath,
}

// Unix uses an epoch located at 1/1/1970-00:00h (UTC) and NTP uses 1/1/1900-00:00h.
// This leads to an offset equivalent to 70 years in seconds
// there are 17 leap years between the two dates so the offset is
pub(crate) const EPOCH_OFFSET: u32 = (70 * 365 + 17) * 86400;