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An overview of all my projects can be found here: ahokcool


This project was created as part of my studies at: 42 Lisboa

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minitalk

Create a communication programme in the form of a client and a server using UNIX signals.

💡 Lessons learned

• UNIX Signals
• C signal handling

Installation

$ git clone --recurse-submodule https://github.com/ahokcool/minitalk.git  # Clone
$ cd minitalk                                                             # Change directory
$ make                                                                    # Compile
$ ./server                                                                # Start server
$ ./client "Message" <PID of Server>                                      # Send Messages

Test

make test

Connection Procedure

To get more of an binary vibe I renamed the signals...
USR1 = BIT_0
USR2 = BIT_1

Step	Client->Server	Server->Client
say hello	BIT_0	BIT_0
ur ready server?	BIT_1 (each second)	BIT_1 (if ready)
send message literally 'bit by bit' (waiting for an answer after each bit)	BIT_0 (if bit of current char is 0) BIT_1 (if bit of current char is 1)	BIT_0 (to confirm the reception)
send and additional /0 to indicate the end of the message	BIT_0 (8 times)	BIT_1

☝️only if all characters of the message have been transmitted and the client recives the BIT_1 signal from the server it prints SUCCESS!

This allows multiple clients to connect to the server at the same time:

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