Function timer_settime

components/libc/compilers/common/ctime.c:1162–1251

* @brief Sets expiration time of per-process timer. * * See IEEE 1003.1 */

 * See IEEE 1003.1
 */
int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
                  struct itimerspec *ovalue)
{
    struct timespec ts = {0};
    rt_err_t        err = RT_EOK;

    struct timer_obj *timer;
    timer = _g_timerid[(rt_ubase_t)timerid];
    if (timer == NULL ||
        value->it_interval.tv_nsec < 0 ||
        value->it_interval.tv_nsec >= NANOSECOND_PER_SECOND ||
        value->it_interval.tv_sec < 0 ||
        value->it_value.tv_nsec < 0 ||
        value->it_value.tv_nsec >= NANOSECOND_PER_SECOND ||
        value->it_value.tv_sec < 0)
    {
        rt_set_errno(EINVAL);
        return -1;
    }

    /*  Save time to expire and old reload value. */
    if (ovalue != NULL)
    {
        timer_gettime(timerid, ovalue);
    }

    /* Stop the timer if the value is 0 */
    if ((value->it_value.tv_sec == 0) && (value->it_value.tv_nsec == 0))
    {
        if (timer->status == ACTIVE)
        {
            rt_ktime_hrtimer_stop(&timer->hrtimer);
        }

        timer->status = NOT_ACTIVE;
        return 0;
    }

    switch (timer->clockid)
    {
#ifdef RT_USING_RTC
        case CLOCK_REALTIME:
        case CLOCK_REALTIME_ALARM:
            if (flags & TIMER_ABSTIME)
                err = _control_rtc(RT_DEVICE_CTRL_RTC_GET_TIMESPEC, &ts);
            break;
#endif /* RT_USING_RTC */
        case CLOCK_MONOTONIC:
        case CLOCK_BOOTTIME:
        case CLOCK_BOOTTIME_ALARM:
        case CLOCK_PROCESS_CPUTIME_ID:
        case CLOCK_THREAD_CPUTIME_ID:
            if (flags & TIMER_ABSTIME)
                err = rt_ktime_boottime_get_ns(&ts);
            break;
        default:
            rt_set_errno(EINVAL);
            return -1;