How to get a list of open sockets in Linux using C?

Question

Is there a way to get a list of all open sockets ( socket address or socket descriptor ) in Linux using C in user-space or kernel?

Thank you

Answer 1

Open and read the following:

/proc/net/tcp - a list of open TCP sockets

/proc/net/udp - a list of open UDP sockets

/proc/net/raw - a list all the "raw" sockets

These are like "regular" files that you open and read with a filehandle and will give you all the information you could possibly need about each socket.