Function sys_timerfd_settime

components/lwp/lwp_syscall.c:10673–10721

* @brief Set or modify the expiration time for a timer. * * This function is used to arm or re-arm a timer associated with a file descriptor created * by `sys_timerfd_create`. It allows setting a new expiration time and can also return * the previous timer configuration. * * @param[in] fd The file descriptor referring to the timer, which was created using * `sys_timerf

 *       can retrieve the expiration event by reading from the file descriptor.
 */
sysret_t sys_timerfd_settime(int fd, int flags, const struct itimerspec *new, struct itimerspec *old)
{
    int ret = -1;
    struct itimerspec *knew = RT_NULL;
    struct itimerspec *kold = RT_NULL;

    if (new == RT_NULL)
        return -EINVAL;

    if (!lwp_user_accessable((void *)new, sizeof(struct itimerspec)))
    {
        return -EFAULT;
    }

    knew = kmem_get(sizeof(struct itimerspec));

    if (knew)
    {
        lwp_get_from_user(knew, (void*)new, sizeof(struct itimerspec));

        if (old)
        {
            if (!lwp_user_accessable((void *)old, sizeof(struct itimerspec)))
            {
                kmem_put(knew);
                return -EFAULT;
            }

            kold = kmem_get(sizeof(struct itimerspec));
            if (kold == RT_NULL)
            {
                kmem_put(knew);
                return -ENOMEM;
            }
        }

        ret = timerfd_settime(fd, flags, knew, kold);

        if (old)
        {
            lwp_put_to_user(old, kold, sizeof(*kold));
            kmem_put(kold);
        }

        kmem_put(knew);
    }

    return (ret < 0 ? GET_ERRNO() : ret);
}

/**
 * @brief Retrieve the current configuration of a timer.