Operating Systems Lab 4: Working with Process

Description

PART 1 Simple Command Interpreter

Write a special simple command interpreter that takes a command and its arguments. This interpreter is a program where the main process creates a child process to execute the command using exec() family functions. After executing the command, it asks for a new command input ( parent waits for child). The interpreter program will get terminated when the user enters exit.

Example:

./interpreter

command: pwd

• output command: ls -la

• output command: date

• output

command: ls -lr /foldername

• output

command: tail /etc/passwd | grep username

• output

command: ps -u username | grep firefox

• output

command: cat /etc/passwd

• output command: exit

• terminates the program.

PART 2 Average Grade Calculator

There are n (n>1) students enrolled in a course. The course covers x number of chapters from a textbook (x > 1).

In each chapter y number of homeworks are assigned (y>=1). The average grade for each homework in all the chapters need to be found out.

To solve this, write program which has the main process as Director process, which reads a file containing grades of all homeworks of all chapters and creates x number of Manager processes. Each Manager process will take care of solving a chapter. Each manager process will create y number of Worker process and pass marks of n students to each of them and they calculate and print the average.

The input file should contain the data according to the value of x and y and n. For example, the input text file and the process tree for x = 2 and y = 2 and n= 10 will look like the following:

Submission Instructions

• All the programs MUST be clearly indented and internally documented

• Make sure your programs compile and run without any errors

• Only include c files or txt files for submission. Do not include any executables.

• Save all your programs with meaningful names and zip into a single folder as: Lab4_[your last name here].zip (e.g., Lab4_Xyz.zip)

• Email your code with the subject line, “Task4-CSC33200–Section 6X(41557)-lastname“

• Email: sdebnath@ccny.cuny.edu

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