Practice Example Of A System Call (open, Read, Write) (6.2.3) - Communication Between Kernel and User Space

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6 sample questions

Question 1.
What is a system call?
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Think about how applications communicate with the operating system.
Question 2.
What does the 'close()' system call do?
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What do you do when you're finished using something?
3Question 3.
What does the open() system call do?
- Creates a new file
- Opens an existing file
- Deletes a file
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Think about what happens to a file when you open it.
4Question 4.
True or False: The close() system call is optional and can be omitted.
- True
- False
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What happens if you leave a door open?
Question 5.
Design a simple C program that opens, reads, and writes to a file, incorporating robust error handling and resource management.
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What steps must you follow to ensure your program doesn't leak resources?
Question 6.
Explain the potential consequences of neglecting to close file descriptors in a long-running application.
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In what scenarios might this become a significant problem?

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