finding rx_bytes and tx_bytes

[kanhu rauta]

Hi all,

i am using fedora with kernel version 2.6.9-1.667.
i want to know the total bytes received(RX packets) and total bytes transmitted (TX packets) on a particular interface.
i have found that there is a structure " strcut net_device_stats", which is declared in "/usr/include/linux/netdevice.h" keeps the information of rx_bytes ant tx_bytes.
how i 'll access this structure in my c program.
what are the system calls available in linux to access this structure. 

regards
kanhu