Understanding socket() , bind() , listen() , accept() , and connect() .
: You have 3 hours to pass Exam 06. Practice writing the server completely from scratch on a blank text editor until you can write, debug, and run it within 40 minutes.
: Safely buffer and parse fragmented text data. Allowed Functions
The select() function is central to monitoring multiple file descriptors for activity without blocking the entire program. Essential Code Components 42 Exam 06
: Create a server socket using socket() , bind() it to a port, and listen() for incoming connections.
If the main server socket is ready, accept the new connection using accept() . If a client socket is ready, read the data using recv() .
You must maintain a master copy of your fd_set and a running tracker of the maximum file descriptor ( max_fd ). Inside the infinite loop, you copy the master set into a working set before passing it to select() . This is because select() modifies the set in place to indicate which sockets have pending data. Step 3: Handling New Connections Understanding socket() , bind() , listen() , accept()
Assign a unique ID to the client and broadcast their arrival. Step 4: Handling Client Data and Disconnections
: TCP delivers data as a continuous stream, not as discrete packets. A client might send a partial message, or multiple messages glued together. Your server must buffer incoming bytes per client and only process/broadcast them when a newline ( \n ) delimiter is reached. 4. Step-by-Step Architecture of an Exam-Ready Server
The automated grading system (Grademe / Moulinette) expects a highly specific behavior from your executable. Socket Setup Workflow : Use socket(AF_INET, SOCK_STREAM, 0) . : Safely buffer and parse fragmented text data
Passing requires rigorous practice, particularly in network programming and memory management. By focusing on select() based servers and perfecting your C skills, you can approach this exam with confidence.
(the most common choice for this exam) to monitor the server socket for new connections and existing client sockets for incoming data. Handling New Connections : If the server socket is "ready," use
: Iterate through all active file descriptors from 0 up to max_fd .
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