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Unix socket is what, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Cause: Daping in the unix operation and maintenance, always found that the suffix is sock files, so think, what is this file? What's the use? Why is there this file?

The Socket file is used as an identity for processes in the same OS or different OS to transfer data to each other. Think of it as a socket, and then connect two socket with a network cable.

Why is it a file?

To put it simply, it is most convenient to use files

The file system is synchronized with System Call (system call) in Unix, so it can be seen that the file system can provide a convenient way to use System call.

How does the process use socket?

Processes use socket descriptor to use socket, which is an abstract concept and is usually represented by an integer. A process usually creates a socket for a protocol stack (protocol stack) request, and then stack returns a socket descriptor to the process. When the process wants to send or receive data, it sends the socket descriptor to the protocol stack.

When communicating between two node, the process will not directly connect to the socket descriptor of the other node, but connect to the socket descriptor of the node [an integer], and then send the data to the protocol stack by the socket of this node, and then transmit the data to the process of the other node after receiving by the protocol stack of the node.

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