In a nutshell
A Unix domain socket serves as an endpoint for communication between processes running on the same machine. Each Unix domain socket is identified using a file system path (similar to regular files).
Create a socket
You can create a socket using the
socket() system call. This will return a file descriptor.
Connecting to a socket
You can use the
connect() system call to establish a connection to another process that’s listening on the same socket using the
listen() system calls.
Sending messages via sockets
Once two processes have established a socket connection, they can data through the socket using the
recv() system calls.
View Unix domain sockets
See this post.