For all those interested in the user space aspect, I have posted some patches to ptpd project showing how the API works. https://sourceforge.net/tracker/?group_id=139814&atid=744634 3225599 [PATCH 1/3] Convert to POSIX clock API. 3225603 [PATCH 2/3] Adapted to use the Linux PTP Hardware Clock API. 3225607 [PATCH 3/3] Adapted to use the newer SO_TIMESTAMPING Linux API. Enjoy, Richard -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html