socket programming

The server will set up as a server and establish a socket connection using a port number passed in as an argument to the program. For example, the server and client code may be executed as follows: ./server <svr_port> The server will print out a usage statement and terminate the program if the user does not enter the command with the port as the command-line argument. • The server will support up to and including 10 “registered” client connections (registration is done with the JOIN command). Although more than 10 clients can connect to the server, no more than 10 clients may be registered in the database at the same time. In the case of more than 10 clients attempting to register, the server will print out an error message and simply close the connection. Note that clients may come and go as they please, so if, for example, the 10th client “leaves” the service, space is now made available for another client to register. • The server will set up a network socket (i.e., AF_INET) over TCP (i.e., SOCK_STREAM) using the port number passed in as an argument to the program. o The server will bind and listen to the port specified as a command-line argument. When a client connects, a new thread will be spawned to handle the socket using POSIX threads (i.e., pthreads) in Linux. o The server will support the following case-sensitive commands which are all sent as plain ASCII text: