Try to get the hardware end point

Hello every one…

i am new in gnuradio…
i start tracing usrp_rx_cfile…

i want to find the hardware interaction point where data is received by
gnuradio from usrp…
or
from where gnuradio code starts processing & take data from usrp…

I found a function “read” in “file fusb_generic” which calls
“usb_bulk_read”(libusb function) to read data from cyprex(usb)…
is this the starting point of software(gnuradio)…

or is there any other block(part) of gnuradio which put data from
cyprex(from where read by “usb_bulk_read”)…

plz do tolerate if question is illogical or any grammatical mistake…

thanks to all of you in advance…

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