[Solved] CSE381-Homework7- use given values to describe a URL

Background

The /proc file system is a logical view of internal data that is maintained by the Linux kernel about a process. For a given process the kernel exposes a logical file called

/proc/[pid]/stat (where [pid ]is the process ID, e.g., /proc/235/stat). This stats file contains a variety of statistics about the process that can be used to report runtime statistics about the process. In this homework, you will be using the following 3 values as described in the following URL: http://man7.org/linux/man-pages/man5/proc.5.html

Starter code

The starter code for this homework is just the solution for Exercise #9. Invest time to refresh your memory by reviewing the starter code.

Requirements

Suitably extend (how you modify is up to you) the starter source code to perform the following additional functionality:

1. Base case Run a program & record runtime statistics [22 points]: Run a specified command with suitable arguments and return the output and runtime statistics in the HTML format shown further below. Recording of runtime statistics is:
   1. Outputs are sent line-by-line to the client using chunked encoding
   2. Record and print runtime statistics every second by opening & reading

/proc/[pid]/stat

1. Reading and printing statistics each second for the duration of a child process can be accomplished as suggested below:

int exitCode = 0; while (waitpid(pid, &exitCode, WNOHANG) == 0) { sleep(1); // sleep for 1 second. // Record current statistics about the process.

}

1. It is best to run the above loop in a separate thread to record the necessary statistics.

1. The recorded statistics is finally sent to the client as a big chunk at the end of program execution. No special formatting was needed to get the statistics/numbers to be printed as shown in expected outputs.

2. Setup statistics to plot a chart [8 points]: If the genChart parameter (3^rd parameter) to the serveClient method is true, then the program should also generate the runtime statistics as a JSON array in the following format:

[ second, utime+stime, vsize ]

See annotated HTML in base case output below for details.

Note: This output should use exactly the same statistics values from base case. Do not reread the stats file to generate the statistics in JSON output.

3. Code quality [5 points]: Five points in this homework are reserved for good code quality, effective code reuse, and documentation (in the form of comments). These 5 points would be the hardest to earn in this homework.

Functional testing

The supplied starter code already includes a simple test harness that will also be used for testing and grading purposes. Several test inputs and expected output files are also supplied to streamline your testing as shown below. The true/false flag (i.e., last command-line argument) is used to enable/disable generation of JSON format used to plot charts.

$ ./hw7 base_case1_inputs.txt my_base_case1_output.txt false

$ diff my_base_case1_output.txt base_case1_expected_outputs.txt

Testing for graph case:

$ ./hw7 base_case1_inputs.txt my_graph_case1_output.txt true

$ diff my_graph_case1_output.txt graph_case1_expected_outputs.txt

Needless to add, the above diff commands will not produce any output if the outputs are identical.

Ensure you test with input files and corresponding expected outputs prior to submission.

Browser testing

You may test operation of your webserver running on os1.csi.miamioh.edu. A partial screenshot is shown further below for your reference (you may have to use a different port number instead of 4000).