Function timerfd_do_settime

components/libc/posix/io/timerfd/timerfd.c:363–493

}

static int timerfd_do_settime(int fd, int flags, const struct itimerspec *new, struct itimerspec *old)
{
    int ret = 0;
    struct rt_timerfd *tfd;
    struct dfs_file *df;
    struct timespec current_time;
    int tick_out;
    rt_int64_t value_msec;
    rt_int64_t interval_msec;
    rt_int64_t cur_time = 0;

    if (fd < 0)
    {
        rt_set_errno(EINVAL);
        return -EINVAL;
    }

    df = fd_get(fd);
    if (!df)
        return -EINVAL;

    tfd = df->vnode->data;

    rt_atomic_store(&(tfd->ticks), 0);
    rt_atomic_store(&(tfd->timeout_num), 0);

    rt_mutex_take(&tfd->lock, RT_WAITING_FOREVER);
    tfd->isperiodic = INIT_PERIODIC;

    if (old)
    {
        old->it_interval.tv_nsec = tfd->ittimer.it_interval.tv_nsec;
        old->it_interval.tv_sec = tfd->ittimer.it_interval.tv_sec;
        old->it_value.tv_nsec = tfd->ittimer.it_value.tv_nsec;
        old->it_value.tv_sec = tfd->ittimer.it_value.tv_sec;
    }

    if (new)
    {
        if (tfd->timer != RT_NULL)
        {
            rt_timer_stop(tfd->timer);
            rt_timer_delete(tfd->timer);
            tfd->timer = RT_NULL;
        }

        if (new->it_value.tv_nsec == 0 && new->it_value.tv_sec == 0)
        {
            rt_mutex_release(&tfd->lock);
            return 0;
        }

        value_msec = (new->it_value.tv_nsec / MSEC_TO_NSEC) + (new->it_value.tv_sec * SEC_TO_MSEC);
        interval_msec = (new->it_interval.tv_nsec / MSEC_TO_NSEC) + (new->it_interval.tv_sec * SEC_TO_MSEC);

        current_time.tv_nsec = 0;
        current_time.tv_sec = 0;