Hello all,

So I've been trying to make an tiny linux application that parses the RX bytes and TX bytes of an interface.

So as of right now my small application calls ifconfig every 0.5 seconds and just parses ASCII data, which is slow and costly.

So I decided to look up ifconfig.c's source to see where and how the interfaces are being brought up and how the data is being gathered, however I am having a difficult time doing so or where to look.

In ifconfig, there is a function called void printall(const *ifname) however I'm not seeing where exactly those Send/Receive bytes are being put together from? is it from the structs? if so which one and which variables from the struct?

This one is a toughy guys! Please help, I've been scratching my head with this one.

Most utilities read kernel driver values through the /sys virtual file system. The files you want to read in this case are:

Technically, you should determine where sysfs is mounted by parsing /proc/mounts but that means you need to know where proc is mounted, so I usually don't bother.

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Holy cow, I can't explain how much this actually blew my mind! Thank you SO much! This just saved a lot of code traversal! I would like to know how you came about this answer as I'm still understanding the Linux filesystem architecture.

One of the original ideas of Unix is that everything is a file accessible through a single hierarchical namespace.
/sys extends that for kernel data. /proc for process information.
Look around in /proc and you will find everything the ps command returns.
Look in the Documentation directory of the kernel source and you will find lots of things to "blow your mind".

http://lxr.free-electrons.com/source/Documentation/

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