## Introduction

Building on the previous project, in this project, you will develop stack tracking and visualization functionality to programs that may create multiple processes.

You can reuse **your code** from the previous project. But note that you will need to update parts of it to handle the work of this project.

> **Note:** You must always consult the manual pages to understand the standard functions that you use in your code. If you start using a function by relying on your understanding based on just a sample code, you will end up wasting a lot of time trying to debug the resulting errors as you may miss important information.

> **Note:** This project has been designed based on `gcc`’s capability for code instrumentation. Other compilers might not support the required options. Make sure you use `gcc`.

## Tasks

Your code in this project will be in the same modular structure as in the last project. However, two separate test programs are provided.

– `inst.c` will be the main source file of your instrumentation unit.

– `testpipe.c` and `testfork.c` are two separate test programs that have `main()` functions. Your instrumentation must work for both programs (or any other multi-process program).

– `stackviz.c` will be the program to “visualize” (in the text mode) the data that you collect during program instrumentation.