: While some students aim for a "shortest version" to memorize, understanding the select loop is critical. If your logic for FD_ISSET is wrong, the server will hang.
External Resources:
: When a client joins, leaves, or speaks, the message format must be exact. A single missing space or newline will cause a failure. Join: server: client just arrived\n Leave: server: client just left\n Chat: client :
Data sent over TCP arrives as a stream of bytes, not as distinct packets. A client might send a message in pieces, or bundle multiple messages together. Your server must use a persistent buffer for each client. Append new data to the client's specific buffer. Scan the buffer for newline characters ( \n ). Extract and broadcast complete lines only. 42 Exam 06
: You primarily work with socket , bind , listen , accept , select , recv , and send .
You are typically required to use the select() function to manage multiple client connections simultaneously without using threads.
Exam 06 requires you to build a simplified, functional IRC (Internet Relay Chat) server from scratch in under three hours. You are typically given a basic template or required to write the server entirely using a single select() or poll() loop. : While some students aim for a "shortest
Duplicate the master set before calling select() , as select() modifies the set passed to it.
The automated grading system (Grademe / Moulinette) expects a highly specific behavior from your executable. Socket Setup Workflow : Use socket(AF_INET, SOCK_STREAM, 0) .
: Bind to a specific port on localhost (127.0.0.1). A single missing space or newline will cause a failure
: Put the server into a passive mode to wait for incoming client connections.
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