BM_GetHostPtpTime
函数名、签名、参数与返回值和 BMAPI SDK 保持一致，可直接用于开发、检索与代码审查。
Get PTP timestamp in nano-seconds of the host machine, which is calling BMAPI.
BMAPI uint64_t BM_GetHostPtpTime (void)Returns
Section titled “Returns”Current PTP timestamp in nano-seconds, in local timezone, since 1970-1-1.
This reference follows the current BUSMUST BMAPI SDK. For an installed package, its bundled header and help files define the exact version-specific contract.