[c] Sockets - How to find out what port and address I'm assigned

I'm having trouble figuring this out - I'm working with sockets in C using this guide - http://binarii.com/files/papers/c_sockets.txt

I'm trying to automatically get my ip and port using:

server.sin_port = 0;              /* bind() will choose a random port*/
server.sin_addr.s_addr = INADDR_ANY;  /* puts server's IP automatically */
...
...
bind(int fd, struct sockaddr *my_addr,int addrlen); // Bind function

After a successful bind, how do I find out what IP and Port I'm actually assigned?

The comment in your code is wrong. INADDR_ANY doesn't put server's IP automatically'. It essentially puts 0.0.0.0, for the reasons explained in mark4o's answer.