How to get the real name of the controlling terminal?
How can one get the real name of the controlling terminal (if there is one, else an error) as a pathname?
controlling-terminal
Concept of controlling terminal in Unix
Can some one please explain in an easy to understand way the concept of controlling terminal in unix and unix like systems ? Is it related to a session ? If yes, then how ?
Does a shell automatically connect file descriptors 0, 1 and 2 to its controlling terminal?
From The Linux Programming Interface