os_hw1's Introduction
The given skeleton includes the following files: - Commands.h/Commands.cpp: The supported commands of smash, each command is represented by a class that inherits from either BuiltInCommand or ExternalCommand. Each command that you add should implement execute, which is a virtual method, that executes the command. - signals.h/signals.cpp: Declares and implements requires signal handlers: SIGINT handler to handle Ctr+C and SIGTSTP to handle Ctrl+Z. If you are going to implement the bonus part then you have to implement additional handler for SIG_ALRM. - smash.cpp: Contains the smash main, which runs an infinite loop that receives the next typed command and sends it to SmallShell::executeCommand to handle it. Please note that if you are going to implement the bonus part, then you have to define a handler for SIG_ALRM in the main (in this file). - Makefile: builds and tests using a basic test your smash. You can use "make zip" to prepare a zip file for submission; this is recommended, which makes sure you follow our submission's structure. - test_input1.txt / test_expected_output1.txt: basic test files that being used by the given Makefile to run a basic test on your smash implementation. Our solution and the skeleton code as well use a few known design patterns for making the code modular and readable. We use mainly two design pattersn: Singleton and Factory Method. There are many resources on the internet explaining about these design patters; they are, sometimes, known as the GoF (Gan of Four) design patters. We recommend you do a quick review of these two design patters for a better understanding of the skeleton. How to start: First, you have to understand the skeleton design. The given skeleton works as follows: - in smash.cpp the main function runs an infinite loop that reads the next typed command - after reading the next command it calls the SmallShell::executeCommand - SmallShell::executeCommand should create the relevant command class using the factory method CreateCommand - After instantiating the relevant Command class, you have to: - fork if needed - call setpgrp from the child process - run the created-command execute method (from the child process or parent process?) - should the parent wait for the child? if yes, then how? using wait or waitpid? To implement new commands, you need to: - Implement the new command Class in Commands.cpp - Add any private data fields in the created class and initialize them in the ctor - Implement the new command execute method - Add if statement to handle it in the SmallShell::CreateCommand We recommend that you start your implementation with: - the simple built-in commands (e.g., chprompt/pwd/showpid/cd/...), after making sure that they work fine with no bugs, then move forward - implement the rest of the built-in commands - implement the external commands - implement the execution of external commands in the background - implement the jobs list and all relevant commands (fg/bg/jobs/...) - implement the I/O redirection and the pipes - Finally implement the bonus command. Good luck :)
os_hw1's People
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. ๐๐๐
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google โค๏ธ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.