Consider the following programs: -server.c ( https://ufile.io/r6578 ) -client.c ( https://ufile.io/l2jna ) Server can connect with multiple clients.

The goal is to extend the client / server application and convert it into a chat room using shared memory.

- Server Process Expand the function of the server program so that the affiliate processes use shared memory to create a shared circular buffer where the messages will be placed. Shared memory will be generated by the parent process and will be accessible from affiliate processes. Each affiliate process expects a message from the customer with a timeout of i (timeout) for 1 second. If it receives a message, it will place it in the buffer. When the end of time occurs, it will send the client all the cached messages that have not yet been sent to the client.

- Client Process Modify the client code so that it waits either for user input or for a message from the server. When the user enters some text it will be sent to the server. If the server sends a message, it will appear on the client screen. The process can use multiplex (call select) to determine whether a message has been sent from the server or the user. Note: Server-client communication becomes asynchronous in this way.

The answer should be based to the above programs (sever.c / client.c).

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