The erasechar() function returns the current ERASE character from the tty driver. This character is used to delete the previous character during keyboard input. The returned
value can be used when including deletion capability in interactive programs.
The killchar() function is similar to erasechar(). It returns the current KILL character.
The erasewchar() and killwchar() functions are similar to erasechar() and killchar() respectively, but store the ERASE
or KILL character in the object pointed to by ch.