Certain characters have special functions on input or output or both.
These functions are summarized as follows:
INTR Special character on input and is recognized if the ISIG flag
(see the Local Modes section) is enabled. Generates a SIGINT
signal which is sent to all processes in the foreground process
group for which the terminal is the controlling terminal. If
ISIG is set, the INTR character is discarded when processed.