packet capturing

[rajput g v be comp 56]

hi,
   packet can be captured by using "tcpdump" straightway,but can i write
something of my own (in C or assembly language) so as to capture the
packets in raw format on my own. 
 the idea is the same as writing a driver on Win@#$ so as to capture
capture in there raw format ,so i was wondering whether that could be done
on linux ?if yes then please help
 

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