CS330 Project (Fall 2005)--Details

Part 2 (Due December 2)--worth 7%

The following is the detailed marking scheme and submission details.

Marking scheme(out of 17):

• ___/0.5 implemented EXIT (this should be implemented using signals)
• ___/2 implemented shell using fork/execvp/wait system calls
• ___/3 implemented '%' breakdown:
• ___/0.5 finding the '%'
• ___/1 correct functioning (ie. parent doesn't wait)
• ___/1 message is printed when the child is done
• ___/0.5 in subsequent commands, parent correctly waits for child
• ___/1 implemented LAUNCH (parent doesn't wait)
• ___/1 implemented ORDINARY (parent waits)
• ___/1 implemented MODE (print whether in LAUNCH or ORDINARY mode)
• ___/1 implemented SLEEP (calls library routine)
• ___/5 implemented piping using ':' breakdown:
• ___/0.5 finding the ':'
• ___/2 separating into two argument vectors
• ___/2 executing commands and feed output of one as input to other using a pipe
• ___/0.5 parent correctly waits for child to finish
• ___/1.5 clearly outlined documentation of assumptions and structures used
• ___/1.0 appropriate comments, whitespace, and variable names.

A couple of HINTS:

1. you may find it useful to use waitpid instead of wait. For more on this system call, use man 2 wait.
2. The piping can be implemented by forking within the child.

Submission Details

1. Along with your source code and script, you will include a document providing:
   • an outline of your program's design (using words and/or pictures of the structures/classes used). These are things used specifically for Part 2.
   • a list of assumptions made in the program design and coding. This will include assumptions that were inherited from the basic code that you were given to get you started
2. You will submit a complete source listing. Your code must be well commented, have appropriate indentation and white space, use meaningful variable names and constants.
3. You will also submit a script of your run performing the following:

   sleep 9
   sleep 60 %
   sleep 40 %
   ps
   LAUNCH
   LAUNCH
   MODE
   sleep 70 
   sleep 80
   sleep 100 %
   MODE
   ps
   ORDINARY
   date
   touch hello
   ls -l
   rm hello
   ls -l
   MODE
   SLEEP 5
   SLEEP 60 %
   MODE
   SLEEP 40 %
   ps
   LAUNCH
   MODE
   SLEEP 70
   SLEEP 80
   SLEEP 100 %
   ps
   cp /net/share/class-info/cs330/joke.txt joke1.txt
   cp /net/share/class-info/cs330/joke2.txt joke2.txt
   cp /net/share/class-info/cs330/joke3.txt joke3.txt
   cp /net/share/aliases/CS330-001.200530 allofus.txt
   ls -l
   ls -l : sort
   cat joke1.txt : sort
   cat allofus.txt : wc -l
   echo "Hello"
   cat joke2.txt
   env : grep USER
   blah
   peanuts
   EXIT