System-Programming

Project 1 : Vaccination App

Part 1 : Vaccination App

Developed an app that receives, processes, record and answers questions on whether a citizent is vaccinated or not. The basic goal of the project is that the app uses the following datastractures in order to handle the data and operate on question answering:

• Bloom Filter
• Skip List
• Hash Tables, Linked Lists, etc.

Part 2 : Bash Script

Created a bash script that generates test files for the Vaccination App (Part 1). The script takes as input:

• virusesFile: a file with viruses names (one per line)
• countriesFile: a file with countries names (one per line)
• numLines: number of lines of the output file that will be generated
• duplicatesAllowed: if 0, citizenIDs must be unique, if 1 dulpicate citizenIDs are allowed

Project 2 : Travel Monitor

Goal of this project is to familiarize with:

• Processes creation using system calls (fork/exec)
• Process communication via pipes
• Use of low level I/O
• Bash Script creation

Part 1 : Travel Monitor App

Developed an app that uses:

• Data Structures of Project 1 (Bloom Filter, Skip List)
• Processes creation using system calls (fork/exec)
• Communication between multiple processes using pipes
• Low level I/O (e.g. Signals) In order to execute the following operations:
• Decide whether a citizen can travel to a country at a given date, taking into considaration his vaccination information.
• Add new vaccination info to the "database" (e.g. if a citizen has just vaccinated)
• Find the vaccination status of a given citizen.
• Compute and print statistics about the travel requests that have been made.

Part 2 : Bash Script

Created a bash script that generates test subdirectories and input files for the Travel Monitor App (Part 1). The script takes as input:

• inputFile: a file with same format as the input files of Project 1.
• input_dir: the name of the directories where the subdirectories will be placed.
• numFilesPerDirectory: number of files tha every directory will contain.

Project 3 : Travel Monitor v2

Goal of this project is to familiarize with:

• Thread creation
• Network Programming using sockets

Modified the Travel Monitor App of Project 2, in order to use Threads and the communication is performed over sockets. The functionality remains the same. Main differences are that the communication over pipes is replaced with socket communication and the input file parsing is performed by a number of threads.