Function timerfd_do_gettime

components/libc/posix/io/timerfd/timerfd.c:495–547

}

static int timerfd_do_gettime(int fd, struct itimerspec *cur)
{
    struct rt_timerfd *tfd;
    struct dfs_file *df = RT_NULL;
    struct timespec cur_time;
    rt_int64_t tv_sec = 0;
    rt_int64_t tv_nsec = 0;

    df = fd_get(fd);

    if (df == RT_NULL)
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    tfd = df->vnode->data;

    get_current_time(tfd, &cur_time);

    rt_mutex_take(&tfd->lock, RT_WAITING_FOREVER);

    tv_sec = cur_time.tv_sec - tfd->pre_time.tv_sec;
    tv_nsec = cur_time.tv_nsec - tfd->pre_time.tv_nsec;
    timerfd_time_operation(&tv_sec, &tv_nsec);
    cur->it_interval.tv_nsec = tfd->ittimer.it_interval.tv_nsec;
    cur->it_interval.tv_sec = tfd->ittimer.it_interval.tv_sec;

    if (tfd->isperiodic == ENTER_PERIODIC)
    {
        cur->it_value.tv_nsec = tfd->ittimer.it_interval.tv_nsec - tv_nsec;
        cur->it_value.tv_sec = tfd->ittimer.it_interval.tv_sec - tv_sec;
        timerfd_time_operation(&cur->it_value.tv_sec, &cur->it_value.tv_nsec);
    }
    else
    {
        if (rt_atomic_load(&(tfd->timeout_num)) == 1)
        {
            cur->it_value.tv_nsec = 0;
            cur->it_value.tv_sec = 0;
        }
        else
        {
            cur->it_value.tv_nsec = tfd->ittimer.it_value.tv_nsec - tv_nsec;
            cur->it_value.tv_sec = tfd->ittimer.it_value.tv_sec - tv_sec;
            timerfd_time_operation(&cur->it_value.tv_sec, &cur->it_value.tv_nsec);
        }
    }

    rt_mutex_release(&tfd->lock);

    return 0;
}

/**
 * @brief Creates a file descriptor for a timer.