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// Copyright (c) 2020 Xu Shaohua <shaohua@biofan.org>. All rights reserved.
// Use of this source is governed by Apache-2.0 License that can be found
// in the LICENSE file.

//! From `include/linux/time64.h`

#![allow(clippy::module_name_repetitions)]

pub type time64_t = i64;
pub type timeu64_t = u64;

#[repr(C)]
#[derive(Debug, Default, Clone)]
pub struct timespec64_t {
    /// seconds
    pub tv_sec: time64_t,
    /// nanoseconds
    pub tv_nsec: isize,
}

#[repr(C)]
#[derive(Debug, Default, Clone)]
pub struct itimerspec64_t {
    pub it_interval: timespec64_t,
    pub it_value: timespec64_t,
}

/// Parameters used to convert the timespec values:
pub const MSEC_PER_SEC: i64 = 1000;
pub const USEC_PER_MSEC: i64 = 1000;
pub const NSEC_PER_USEC: i64 = 1000;
pub const NSEC_PER_MSEC: i64 = 1_000_000;
pub const USEC_PER_SEC: i64 = 1_000_000;
pub const NSEC_PER_SEC: i64 = 1_000_000_000;
pub const FSEC_PER_SEC: i64 = 1_000_000_000_000_000;

/// Located here for `timespec[64]_valid_strict`
/// ```rust
/// assert_eq!(nc::TIME64_MAX, 9223372036854775807_i64);
/// ```
#[allow(clippy::cast_possible_wrap)]
pub const TIME64_MAX: i64 = (!(1_u64 << 63)) as i64;

/// ```rust
/// assert_eq!(nc::TIME64_MIN, -9223372036854775808_i64);
/// ```
pub const TIME64_MIN: i64 = -TIME64_MAX - 1;

/// ```rust
/// assert_eq!(nc::KTIME_MAX, 9223372036854775807_i64);
/// ```
#[allow(clippy::cast_possible_wrap)]
pub const KTIME_MAX: i64 = (!(1_u64 << 63)) as i64;

/// ```rust
/// assert_eq!(nc::KTIME_SEC_MAX, 9223372036_i64);
/// ```
pub const KTIME_SEC_MAX: i64 = KTIME_MAX / NSEC_PER_SEC;

/// Limits for `settimeofday()`:
///
/// To prevent setting the time close to the wraparound point time setting
/// is limited so a reasonable uptime can be accomodated. Uptime of 30 years
/// should be really sufficient, which means the cutoff is 2232. At that
/// point the cutoff is just a small part of the larger problem.
pub const TIME_UPTIME_SEC_MAX: i64 = 30 * 365 * 24 * 3600;
pub const TIME_SETTOD_SEC_MAX: i64 = KTIME_SEC_MAX - TIME_UPTIME_SEC_MAX;