revamp of signals

[saladuit]

There are a few instances that should be made:

• Canonical mode
• Non Canonincal mode
• Signal handler for when a child exits to catch their exit status

[saladuit]

Difference between canonical and non-canonical mode:
In canonical mode, the terminal driver buffers input until a line-ending character is received (usually the Enter key). Once a line-ending character is received, the entire line is returned to the program reading from the terminal. Canonical mode is typically used for command-line interfaces, where the user inputs a command and then presses Enter to execute it.

In non-canonical mode, input is not buffered by the terminal driver and is returned to the program as soon as it is received. Non-canonical mode is typically used for applications that require real-time input, such as games or other interactive programs.

[saladuit]

There is are leaks when the sheldon is in canonical mode and one sends a kill signal.

[saladuit]

This will be further handled by #13 because it is a duplicate