Get local network interface addresses using only proc?

Question

How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I\'ve discovered the following:

Answer 1

It's bass-ackwards and I probably am forgetting a corner case, but if you look at /proc/1/net/route, that has your routing table. If you select lines for which the gateway is 0.0.0.0, the first column is the interface and the second column is the hex representation of your IP address, in network byte order (and the third column is the gateway ip you want to filter on).