7 Unix Domain Sockets

So far in this book, we’ve discussed communications between nodes on a network. But not all network programming occurs exclusively between separate nodes. Your applications may sometimes need to communicate with services, such as a database, hosted on the same node.

One way to connect your application to a database running on the same system would be to send data to the node’s IP address or localhost address—commonly—and the database’s port number. However, there’s another way: using Unix domain sockets. The Unix domain socket is a communication method that uses the filesystem to determine a packet’s destination ...

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