Function sys_sysinfo

components/lwp/lwp_syscall.c:8703–8747

* @brief Retrieve system information. * * This function provides details about the current state of the system, such as uptime, memory usage, * load average, and other key statistics. The information is stored in a structure pointed to by `info`. * * @param[out] info A pointer to a buffer where system information will be stored. The structure should * be compatible with the

 *       memory for the structure.
 */
sysret_t sys_sysinfo(void *info)
{
#ifdef ARCH_MM_MMU
    struct sysinfo kinfo = {0};
    rt_size_t total_pages = 0, free_pages = 0;

    if (!lwp_user_accessable(info, sizeof(struct sysinfo)))
    {
        return -EFAULT;
    }

    kinfo.uptime = rt_tick_get_millisecond() / 1000;
    /* TODO: 1, 5, and 15 minute load averages */
    kinfo.loads[0] = kinfo.loads[1] = kinfo.loads[2] = rt_object_get_length(RT_Object_Class_Thread);
    rt_page_get_info(&total_pages, &free_pages);
    kinfo.totalram = total_pages;
    kinfo.freeram = free_pages;

    /* TODO: implementation procfs, here is counter the lwp number */
    struct lwp_avl_struct *pids = lwp_get_pid_ary();
    for (int index = 0; index < RT_LWP_MAX_NR; index++)
    {
        struct rt_lwp *lwp = (struct rt_lwp *)pids[index].data;

        if (lwp)
        {
            kinfo.procs++;
        }
    }

    rt_page_high_get_info(&total_pages, &free_pages);
    kinfo.totalhigh = total_pages;
    kinfo.freehigh = free_pages;
    kinfo.mem_unit = ARCH_PAGE_SIZE;

    if (lwp_put_to_user(info, &kinfo, sizeof(struct sysinfo)) != sizeof(struct sysinfo))
    {
        return -EFAULT;
    }

    return 0;
#else
    return -1;
#endif
}

/**
 * @brief Set scheduling parameters for a specific thread.