HarmonyOS 获取开机时间

获取手机的开机时间API：

其他系统代码如下

bootTime{
    struct timeval boottime;
    int mib[2] = {CTL_KERN, KERN_BOOTTIME};
    size_t size = sizeof(boottime);
    time_t now;
    time_t uptime = -1;
    (void)time(&now);
    if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && boottime.tv_sec != 0)
    {
      uptime = now - boottime.tv_sec;
    }
    return uptime;
}
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