Function sys_timer_settime

components/lwp/lwp_syscall.c:3135–3157

* @brief Changes the time or interval of an existing timer. * * This system call modifies the expiration time or interval of a previously created * timer. It can either set a new expiration time for the timer or update the * interval for periodic timers. The timer can be started or modified based on * the flags provided. The current (old) timer settings can be retrieved if * requested. * *

 *          before making changes.
 */
sysret_t sys_timer_settime(timer_t timerid, int flags,
                           const struct itimerspec *restrict new_value,
                           struct itimerspec *restrict old_value)
{
    int ret = 0;
#ifdef ARCH_MM_MMU
    struct itimerspec new_value_k;
    struct itimerspec old_value_k;

    if (!lwp_get_from_user(&new_value_k, (void *)new_value, sizeof(*new_value)) ||
        (old_value && !lwp_get_from_user(&old_value_k, (void *)old_value, sizeof(*old_value))))
    {
        return -EFAULT;
    }

    ret = timer_settime(timerid, flags, &new_value_k, &old_value_k);
    lwp_put_to_user(old_value, (void *)&old_value_k, sizeof old_value_k);

#else
    ret = timer_settime(timerid, flags, new_value, old_value);
#endif
    return (ret < 0 ? GET_ERRNO() : ret);
}

/**
 * @brief Retrieves the current time and interval of a timer.