Description

CS 3424 – Systems Programming Sam Silvestro – UTSA
IMPORTANT NOTICE ABOUT THIS ASSIGNMENT
Instead, you MUST utilize servers hen04.cs.utsarr.net or hen03.cs.utsarr.net. Note that these servers are accessible only in the following ways:
(1) Within the UTSA network (i.e., using the on-campus network);
(2) via VDI from home; or,

For this assignment, you will use C’s process control functions to exercise basic process creation. Your program should have the following functionality:
Concurrency
Given up to six commands separated by commas (a comma will be its own token, with whitespace around it) and any number of arguments each, execute all commands concurrently (i.e., in parallel and not one after the other).
Each process (excluding the parent) should print their PID followed by their PPID followed by their command without arguments to stderr. Any normal behavior by the command issued should remain the same. You do not need to account for redirection or pipelining.
Your program should not produce orphans. Toward verification of this, if a process’s PPID is 1, it is an orphan that has been adopted by the init process. In solving this problem, be sure that your child processes still run concurrently. Do not wait for one process to complete before starting a new one.
Example
$ assign6 ls -a , pwd , cat hello.txt PID: 35003, PPID: 35002, CMD: ls
PID: 35004, PPID: 35002, CMD: pwd PID: 35005, PPID: 35002, CMD: cat
/home/ssilvestro
. .. courses Desktop Downloads this is the contents of hello.txt
Note that since the processes are happening in parallel, the order of the output is not guaranteed.
Compiling Your Program
Your submission will include a makefile so the following command can be used to compile your code.
$ make assign6
This should produce an executable file named assign6. For more information about the make utility, check the related document on Blackboard.
If you attempt the extra credit, $ make assign6-ec should compile the extra credit portion to assign6-ec.
Extra Credit (25 points)
Create a second program, assign6-ec which takes exactly two commands, with any number of arguments each, and separated by a comma. The program should pipe the output of the first command to the second using dup2().
Example
$ assign6-ec ls -l , sort -k5 -n should behave as
$ ls -l | sort -k5 -n
Extra credit is not given to late assignments. All requirements must be met for both parts of the assignment to qualify for extra credit.
Assignment Data
This assignment does not include sample input files since it will only take arguments.
Program Files
Your submission should consist of up to five files:
• assign6.c – the main file which is compiled (required)
• assign6.h – an optional header file if necessary
• assign6-ec.c – the main file which is compiled for extra credit (required for extra credit)
• assign6-ec.h – an optional header file if necessary
• Makefile – the makefile to make the assign6 executable (required).
Submission
Turn your assignment in via Blackboard. Your zip file, named a8-abc123.zip should contain only the files described above.
If you attempt the extra credit, name your file a8-abc123_EC.zip. Without the _EC, your submission will be graded as normal.