C Language Implementation ifconfig get network card receive and send traffic statistics

Under Windows we can use the ipconfig command to obtain information about the network card, under Linux command is ifconfig

We can obtain more information, including the network card to receive and send traffic, in the C language to achieve this command is not a simple matter, thus, the blogger through the access to relevant information, learned that the network card related information saved in the/proc/net/dev this folder, so we can Obtain information about the corresponding network card by reading the information in this file.

This file contains four parts, namely: the number of packets sent, the traffic sent, the number of packets received, the flow received, at the same time, due to the network environment in the constant changes, so the content of this document is also updated in real time.

The following picture shows the implementation result of the Ifconfig command

Note that there are a number of parameters that are not saved in the file