Class 21: Homework

You must print this sheet out and write/type answers on it! Also print out the server code with line numbers to refer to in your answers.

Look through the complete TCP server code linked at the bottom of these notes. Right now, if I started the server and 300 people all tried to connect at once, some of those people would simply fail to connect. What would have to change in the server code to ensure that all 300 of those connection requests would be accepted eventually, rather than simply lost in the ether?

The accept system call returns a descriptor sessionfd.

Explain the purpose of the descriptor sessionfd and how it's different from the descriptor sfd.
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Immediately after the call to fork(), the parent process closes the descriptor sessionfd. At what line does this happen?
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Why is it that, immediately after the call to fork(), the parent process closes that descriptor?
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What would have to be done to change this program to work as a single multi-threaded process, rather than multiple processes?

In what situations might you prefer to write a TCP server as a single multi-threaded process rather than multiple processes?