Socket Programming in UDP
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Socket Programming in UDP

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@StunningLosAngeles

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Questions and Answers

What is the main issue with handling input from a TCP socket?

Non-determinism and concurrency

What is one solution to handle non-determinism and concurrency in I/O operations?

Use nonblocking I/O

How can the O_NONBLOCK flag be set using fcntl()?

flags = fcntl(sock,F_GETFL,0); fcntl(sock,F_SETFL,flags | O_NONBLOCK);

What happens when a process uses nonblocking I/O and no input is available?

<p>The system call returns an error and sets errno to EWOULDBLOCK.</p> Signup and view all the answers

What is the advantage of using blocking I/O over nonblocking I/O?

<p>Blocking I/O allows the Operating System to put the process to sleep when nothing is happening (no input).</p> Signup and view all the answers

What is the downside of using nonblocking I/O?

<p>The process will 'busy-wait', using inefficiently the CPU time.</p> Signup and view all the answers

What is an alternative solution to nonblocking I/O for handling concurrency and I/O non-determinism?

<p>Use alarm and signal handler to interrupt slow system calls.</p> Signup and view all the answers

How can multiple processes/threads be used to handle concurrency and I/O non-determinism?

<p>Use multiple processes/threads to handle input from each source.</p> Signup and view all the answers

What type of functions can be used to check multiple input sources at the same time?

<p>Functions that support checking of multiple input sources at the same time.</p> Signup and view all the answers

What is the purpose of the fcntl() system call in nonblocking I/O?

<p>To set the O_NONBLOCK flag.</p> Signup and view all the answers

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