GNU Radio, One Step at a Time: [Discuss-gnuradio] Using 1PPS signal as timestamp data

Dear all,

What should I do in order to insert the timestamp data into the data
file produced by "usrp2_rx_cfile.py"?

I use "usrp2_rx_cfile.py" for getting a wideband waveform data.
In my system, 1 PPS signal from a frequency standard is fed into the
"PPS IN" port of an old type USRP2.