Signal beep beep talk

Siganl beep beep talk is a simple client-server communication project using UNIX signals.

The project demonstrates inter-process communication (IPC) by sending messages from a client to a server.

Features

• Client: Sends a string message to the server, character by character, using signals.
• Server: Receives the message from the client, reconstructs it, and prints it out.

Getting Started!

Prerequisites

• A UNIX-like operating system (Linux, macOS, etc.)
• A C compiler (gcc, clang, etc.)

Installation

1. Clone the repository:

git clone git@github.com:hosu-kim/signal_beep_beep_talk.git
cd signal_beep_beep_talk

2. Compile the project:

make

Usage

1. Start the server:

./server

The server will print its process ID (PID), which you will need to provide to the client. 2. In a separate terminal, run the client with the server's PID and the message you want to send:

./client [server_pid] [message]

Replace [server_pid] with the actual PID of the server and [message] with the string you want to send.

Example

1. Start the server:

$ ./server
Server PID: 12345

2. In a separate terminal, send a message from the client:

$ ./client 12345 "Hello, Beep! Beep!"

Project Structure

• client.c: Contains the client implementation.
• server.c: Contains the server implementation.
• includes/: Contains the header files for the project.
• Makefile: Used to compile the project.

How It Works

Client

The client program takes two arguments: the server's PID and the message to send. It converts each character of the message into its binary representation and sends each bit using signals (SIGUSR1 for bit 1 and SIGUSR2 for bit 0).

Server

The server program sets up signal handlers to receive the signals sent by the client. It reconstructs the received bits into characters and stores them in a buffer. When a null character (\0) is received, it prints the complete message.

Signal Handlers

• SIGUSR1: Represents bit 1.
• SIGUSR2: Represents bit 0. The server uses these signals to build the message character by character.

Error Handling

• The client checks if the provided server PID is valid.
• The server dynamically resizes the buffer to accommodate the incoming message.
• The server handles buffer overflow by printing an error message if the buffer is full.

License

This project is licensed under the MIT License. See the LICENSE file for more details.