How to make two-directional unix domain sockets with SOCK_DGRAM?

Question

I am trying to write a simple Unix datagram server/client, and am having some problems. What I want is a server that listens on a datagram socket and sends a reply to every

Answer 1

Socket need to have address to be addressed to receive packets. You can call bind() with unique socket filename based on the PID or in linux use autobound abstract address if to call before send:

bind(s, (const struct sockaddr *)&sa, sizeof(sa_family_t));