: The subject explicitly requires printing "Fatal error\n" to stderr and exiting with status 1 if any system call fails. Do not use perror() .
+-------------------+ | select() Loop | +---------+---------+ | +-----------------+-----------------+ | | v v [ Listening Socket Ready ] [ Client Socket Ready ] | | v v accept() new client recv() / send() data 42 Exam 06
Exam 06 at 42 is a milestone that tests core programming skills, problem-solving, and your ability to think under constraints. Whether you’re approaching it for the first time or reattempting, this guide outlines what to expect and gives a focused plan to help you pass. : The subject explicitly requires printing "Fatal error\n"
The absolute hardest part of Exam 06 is handling stream-based I/O correctly. TCP is a stream protocol, not a message protocol. This means: A client might send Hello\nWorld\n in a single packet. Whether you’re approaching it for the first time
I can provide or debugging workflows to help you clear this final hurdle! Share public link
Even well-prepared students can stumble in Exam 06. Here are some common pitfalls and tips to avoid them:
Data sent over TCP is a stream, meaning a single message might arrive split into multiple recv() chunks, or multiple messages might arrive together. You must buffer the incoming data per client and only broadcast when a full line ( \n ) is parsed. 3. Exceeding FD_SETSIZE