ASSIGNMENT 3 Solution

Write code that forks into two processes: a parent process, and a child process.




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REGULAR VERSION




Your code will be called with command-line arguments consisting of positive

integers. Do not worry about bad command-line arguments such as "xyz". Your code

will not be tested in this way.




The parent process will take the arguments to main(), convert them into ints by

calling atoi(), and send those ints one at a time to the child process through

a pipe (one call to write() for each int).




Do not send anything from argv[0] through the pipe. Start with argv[1] and

continue through the rest of the arguments.




The child process will read the ints sent by the parent process one at a

time, and add them up. The child process should not use the arguments to main(),

argc and argv, in any way whatsoever. The child process will communicate the sum

of the numbers to the parent as the return value from main().




The parent process will need to reap the child process to find out that sum.




It may be of use to know that read() will return immediately with a zero once

the other end of the pipe is closed by the parent.




If I call your code this way:




a03 3 5 7




The parent process should print out:




CS201 - Assignment 3 Regular - I. Forgot

sum = 15




The sums produced from the test input I use will be in the range [0 .. 255].




Your code must be able to handle any number of command line arguments.




Important: printing should be done only by the parent process. The child process

should not print anything.




Your output should be formatted as shown (small differences in whitespace are

OK). Remember to replace "I. Forgot" with your own name.




Start with the provided code file a03.c. Upload your code as a03.c.




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PREMIUM VERSION




Same as the Regular version, except that your code must also be able to handle

negative integers input from the command-line.




If I call your code this way:




a03 -3 5 -7




The parent process should print out:




CS201 - Assignment 3 Premium - I. Forgot

sum = -5




The sums produced from the test input I use will be in the range [-128 .. 127].




Start with the provided code file a03p.c. Upload your code as a03p.c.




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REQUIRED PLATFORM




I grade your code on syccuxas01.pcc.edu. Your code is required to compile and

run correctly on that machine.




COMPILING YOUR CODE




You are required to compile your code with the same flags that are used by

the 'gc' bash script in ~michael.trigoboff/bin.




GRADING YOUR CODE




Your code needs to compile without errors or warnings and run correctly. Code

that does not compile will receive zero points. Code that crashes will receive

zero points.




I use bash scripts to grade your code. Because of this, it is very important

that you submit your code with the file name that was requested. If you change

the file name, my scripts will crash, your work will not be graded, you will

have to resubmit a corrected version of your work, and you will lose points.




My scripts produce a log file containing your code, compiler warnings and errors

(if any), your code's output, and some statistics that are useful to me. I then

personally go through that log file to produce your grade. In other words, the

scripts don't generate your grade, they just make it more convenient for me to

generate your grade.




TO SUBMIT THIS ASSIGNMENT




Submit the requested file to Desire2Learn.




* Be certain to check that you completed the upload successfully. After you

click the Upload File button, you must also click the SUBMIT ASSIGNMENT

button. This is very easy to forget. If you do not do this, I will not

see your work and you will get a grade of zero for the assignment. I

would recommend entering an email address so you can be notified that

the upload was completed successfully.

* You may upload as many versions as you wish prior to the due date. I will

only see and grade the final one. You will not be able to upload

assignments after the due date.




Points will be deducted for uploading a file with a name that is not as

specified. Every term I get a few students whose approach to following

directions is, shall we say, "creative." I encourage creativity in general, but

there are places where it is not appropriate.