ptp同步：https://blog.csdn.net/u013431916/article/details/83054369

用ptpd。对应的网口打开时钟协议即可。

时间戳格式化输出：

                    // 秒 毫秒 微秒 纳秒
                    std::cout << "i++ status :timestamp count" << scans[i].headers.at(102).timestamp.count() << std::endl;// 纳秒
                    int nacro = scans[i].headers.at(102).timestamp.count() % 1000000000; //纳秒
                    int micro = (scans[i].headers.at(102).timestamp.count() / 1000000) % 1000; //毫秒
                    time_t timeT =  scans[i].headers.at(102).timestamp.count() / 1000000000;    // 秒
                    struct tm* pTm;
                    pTm = localtime(&timeT);
                    char strTime[100];
                    sprintf(strTime, "%d-%02d-%02d %02d:%02d:%02d.%09d", 1900 + pTm->tm_year, 1 + pTm->tm_mon, pTm->tm_mday, pTm->tm_hour, pTm->tm_min, pTm->tm_sec, nacro);
                    std::cout << "i++ status :timestamp 格式化：" << strTime << std::endl;
                    char strTime2[100];
                    sprintf(strTime2, "%d-%02d-%02d %02d:%02d:%02d.%09d", pTm->tm_year, pTm->tm_mon, pTm->tm_mday, pTm->tm_hour, pTm->tm_min, pTm->tm_sec, nacro);
                    std::cout << "i++ status :timestamp 格式化：" << strTime2 << std::endl;