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Socket Programming in UDP

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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?

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

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

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

What is the downside of using nonblocking I/O?

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

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

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

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

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

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

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

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

To set the O_NONBLOCK flag. Signup and view all the answers