System Administration Tools and Daem IT Assignment Help

Assignment Task

After completing this assignment, you should:

• Understand process execution: forking, executing, and reaping.
• Understand signal handling.
• Have a more advanced understanding of Unix commands and the command line.
• Have gained experience with C libraries and system calls.
• Have enhanced your C programming abilities.
• We strongly recommend that you check the return codes of all system calls and library functions. This will help you catch errors.
• Use a "monkey at a typewriter" approach to testing it and make sure that no sequence of operations, no matter how ridiculous it may seem, can crash the program. Your code should NEVER crash, and we will deduct points every time your program crashes during grading. Especially make sure that you have avoided race conditions involving process termination and reaping that might result in "flaky" behavior. If you notice odd behavior you don't understand: INVESTIGATE. You should use the debug macro provided to you in the base code. That way, when your program is compiled without -DDEBUG , all of your debugging output will vanish, preventing you from losing points due to superfluous output.When writing your program, try to comment as much as possible and stay consistent with code formatting. Keep your code organized, and don't be afraid to introduce new source files if/when appropriate. This assignment will involve the use of many system calls and library functions that you probably haven't used before. As such, it is imperative that you become comfortable looking up function specifications using the man command. The man command stands for "manual" and takes the name of a function or command (programs) as an argument. For example, if I didn't know how the fork(2) system call worked, I would type man fork into my terminal. This would bring up the manual for the fork(2) system call.Navigating through a man page once it is open can be weird if you're not familiar with these types of applications. To scroll up and down a line at a time, you simply use the up arrow key and down arrow key or j and k, respectively. Scrolling a page at a time is done with the space bar and b. To exit the page, simply type q. That having been said, long man pages may look like a wall of text. So it's useful to be able to search through a page. This can be done by typing the / key, followed by your search phrase, and then hitting enter. Note that man pages are displayed with a program known as less . For more information about navigating the man pages with less , run man less in your terminal. Now, you may have noticed the 2 in fork(2) . This indicates the section in which the man page for fork(2) resides.

System Calls

•  C Library Functions
•  Devices and Special Files
• File Formats and Conventions
•  Games et. al
•  Miscellanea
•  System Administration Tools and Daem

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