在C中的同一主机和端口上进行多播侦听

Question

I have a program that listens for multicasts and I'd like it to be able to share a port with other instances of the same program, so that if I have 3 instances running on the same host, they can all share the same port.

Is it possible to do this, would it involve setsockopt and SO_REUSEADDR?

EDIT: I am going off of this site for my code, the only thing I've changed is what is sent in the message.

Answer 1

setsockopt was what I needed, here is an example of what I did:

in the declarations:

int yes = 1;

then before the call to bind() i called setsockopt()

setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));

this now allows me to run multiple instances of the program on the same machine, listening for multicasts on the same port.