Using Socket programming and threading to make a real-time chatroom in c

1. The above code is tested for MAC-OS, it should work with linux and windows but is untested.
2. Server and Client script can be on the same local machine or on different machines. If you want to run the scripts on different machine make sure you have the public IP address and appropriate machine-level permissions (remote connections) for the machine where you run the server script.
3. You may run multiple client instances to test the script

./server ## script will run on port 80 by default
./server 90 ## run the script on port 90

./client [-h] [-a] [-p] [-u]
 -h           show this help message and exit [optional]
 -a           IP address of the server [localhost if running on local machine] [required]
 -p           port number of the server [required]
 -u           username of the person [required]

Each user is handled by a seperate thread in the server.The threads synchronise access to a global linked list storing the user information

When the client connects to the server, it executes a chatroom shell. Each client has 2 running threads one for sending commands and other for receiving msgs, both working in sync with each other.

Feel free to contribute and collaborate

1. Making a testing environment to check for subtle synchronisation bugs
2. Resolving same user-name conflicts
3. adding feature to change user name
4. BUG-: When a user is typing and at the same moment receives a msg in the chatroom