UNIX Network programming: Basic TCP Socket programming

First, the network program based on TCP protocol

The following figure is a general process for client/server programs based on TCP protocol:

After the server calls the socket (), bind (), listen () completes initialization, calls the accept () blocking wait, is in the listening port state, the client calls the socket () initialization, calls connect () sends the SYN segment and blocks waiting for the server to reply, The server answers a syn-ack segment, the client receives a return from connect (), answers an ACK segment, and returns from accept () after receiving the server.

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