42 Exam 06
The Automated Proctoring System is an AI-powered feature designed to monitor and analyze student behavior during online exams, ensuring academic integrity and preventing cheating. This feature will be integrated into the existing 42 Exam platform.
Create a master socket using socket(AF_INET, SOCK_STREAM, 0) .
: The server must be non-blocking; if a client is "lazy" and doesn't read, you must not disconnect them or hang the server. Broadcasting : When a client sends a message, the server must prepend client %d: is their ID) and send it to all connected clients. Specific Formatting Rules
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to take the new client. Assign them a unique ID and send a "server: client [ID] just arrived" message to everyone else. Handling Client Messages : If a client socket is "ready," read the data. Disconnection
The transition to linked lists forces a fundamental reorganization of a programmer's mental model. A candidate can no longer rely on the safety of contiguous array indices. Instead, they must navigate a chain of nodes, manually managing pointers and memory allocation. The specific assignments often require functions such as lst_add or lst_del , which test a student's ability to handle the "edge cases" of memory—what happens when the list is empty? What happens when the allocation fails? This transition teaches the critical skill of defensive programming, forcing the candidate to anticipate failure rather than just aim for success.
: select() requires you to pass the highest file descriptor number plus one ( max_fd + 1 ) to optimize its internal scanning loop. 2. Architectural Blueprint of MiniFTP
Bind the socket to the port and start listening with listen() . 2. The Main Event Loop Clear and populate your read and write fd sets. The Automated Proctoring System is an AI-powered feature
must use a single-threaded loop to monitor multiple file descriptors (FDs). FD Management : You maintain a "master" set of file descriptors and use to identify which FDs have incoming data ( ) or are ready for outgoing data (
Philosophers need to stop eating when someone dies. You must send SIGINT or custom signals to all child processes from the parent when the death condition is met.
: Use nc localhost in multiple terminal windows to simulate real-time client traffic, multi-line inputs, and sudden disconnections to ensure your server doesn't crash. To help tailor this guide further, Would you prefer a breakdown of poll() instead of select() ?
The jump from Exam 04 to Exam 06 is steep. Exam 04 deals with static command chaining. Exam 06 deals with live, asynchronous process management . : The server must be non-blocking; if a
If you try to send() a message to a client whose socket buffer is full, your server might hang. You must check if a file descriptor is ready for writing before sending.
Track client data efficiently using arrays or linked lists indexed by their file descriptor ID.
+-------------------+ | select() Loop | +---------+---------+ | +------------------+------------------+ | | v v [ Listening Socket ] [ Client Sockets ] -> If ready: accept() -> If ready: recv() data -> Add new client to set -> Broadcast to other clients Stream-Based Protocols and Buffering
To pass, one must have internalized the shell not as a command line but as a programming environment. The reward for finishing Level 4 is not just a passing grade—it is the quiet realization that you can now navigate, secure, and automate any Linux system from the ground up.
Get the server to accept one connection first. Iterate: Add the broadcast functionality.
