Function SeqIDSocketControlMessage

timestamp/timestamp_linux.go:225–232

SeqIDSocketControlMessage encodes the SequenceID into a socket control message and specifies SCM_TS_OPT_ID as the Control Message Header type

(seqID uint32, soob []byte)

	h := (*unix.Cmsghdr)(unsafe.Pointer(&soob[0]))
	h.Level = unix.SOL_SOCKET
	h.Type = unix.SCM_TS_OPT_ID
	h.SetLen(unix.CmsgLen(SizeofSeqID))
	data := soob[unix.CmsgLen(0):unix.CmsgLen(SizeofSeqID)]
	binary.NativeEndian.PutUint32(data, seqID)
}

// pollFunc matches unix.Ppoll so tests can drive the EINTR restart path
type pollFunc func(fds []unix.PollFd, timeout *unix.Timespec, sigmask *unix.Sigset_t) (int, error)

func waitForHWTS(connFd int) error {
	return pollForHWTS(connFd, unix.Ppoll)