DragonOS/kernel/src/time/syscall.rs

use core::ptr::null_mut;

use crate::{
    syscall::{Syscall, SystemError},
    time::{sleep::nanosleep, TimeSpec},
};

impl Syscall {
    /// @brief 休眠指定时间（单位：纳秒）（提供给C的接口）
    ///
    /// @param sleep_time 指定休眠的时间
    ///
    /// @param rm_time 剩余休眠时间（传出参数）
    ///
    /// @return Ok(i32) 0
    ///
    /// @return Err(SystemError) 错误码
    pub fn nanosleep(
        sleep_time: *const TimeSpec,
        rm_time: *mut TimeSpec,
    ) -> Result<usize, SystemError> {
        if sleep_time == null_mut() {
            return Err(SystemError::EFAULT);
        }
        let slt_spec = TimeSpec {
            tv_sec: unsafe { *sleep_time }.tv_sec,
            tv_nsec: unsafe { *sleep_time }.tv_nsec,
        };

        let r: Result<usize, SystemError> = nanosleep(slt_spec).map(|slt_spec| {
            if rm_time != null_mut() {
                unsafe { *rm_time }.tv_sec = slt_spec.tv_sec;
                unsafe { *rm_time }.tv_nsec = slt_spec.tv_nsec;
            }
            0
        });

        return r;
    }

    /// 获取cpu时间
    ///
    /// todo: 该系统调用与Linux不一致，将来需要删除该系统调用！！！ 删的时候记得改C版本的libc
    pub fn clock() -> Result<usize, SystemError> {
        return Ok(super::timer::clock() as usize);
    }
}