Process Programming

Open the program

ftest.py and try running to the program to see how it works.

code:

import os$,$ sys$,$ time

pid $=$ os$.$fork$()$

if pid $==0$:

$$ print$("$This is the child... starting the calculator"$)$

$$ os$.$execl$("/$usr$/$bin$/$gnome$-$calculator", "this parameter is ignored"$)$

$$ sys$.$exit$(0)$

print$("$This is the parent... who will wait for $10$ seconds and then stop"$)$

time.sleep$(10)$

The program

runs a new child process using the fork$()$ command as and the child process runs the gnome$-$

calculatorprogram.

Write a new program that displays the following menu to the user and waits for them to type

the command number. When the command number is typed then your python application will

launch an instance of the requested program and show the user the same menu and wait for

them to start more programs.

What the code should look like:

Welcome to Lab $2$ Program Launchpad

$1.$ Run calculator

$2.$ Run Python Program

$3.$ Kill all apps

$4.$ Quit Application

Your Command: $1$

Starting calculator

Welcome to Lab $2$ Program Launc... etc

The calculator program is stored in the $()/($us$)($r$)/($b$)$i$($n$)/($g$)$nome folder.

The Python application is a simple program that should ask the user to enter $5$ integers and

display the sum and average of the numbers. You must write the program.

The "kill all apps" operation should kill all of the other processes started. To get this correct in

the general case is very difficult but for the purposes of this lab you can start one of each

program and allow the option to kill just those applications which have been started. To do

this, the parent program will need to keep each PID of the new process and issue kill

commands.

The order of implementation is suggested as follows:

INFT$2201$ Operating Systems

Write the basic program to display the menu and exit when option $4$ is selected.

Add the code to launch the calculator

Write the Python program and test it on its own. Modify your menu program to launch

it$.$

Add the code to kill all apps $($just the calculator but there could be multiple copies of it

running$).$