The use of select function in linux environment to achieve a chat program, to meet the requirements: (1) The user default for broadcast mode, a client in its client sends a message to other users all of the client can receive (2) program supports the following command/help: display help information/quit: the user out of chat rooms, while out of the information broadcast to other users /who: Display online users /send username message: send to-point message to the specified user. The code is validated to ensure that can run

chat\IOClient.c
....\IOServer.c
chat

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