System Interrupt Handlers

Some of the signals (interrupts) are handled by built-in predicates halt/0, abort/0 and true/0, others have special handlers:

interrupt_prolog/0

asks the user what to do - abort, start a break level, debug, continue or exit.

it_handler/0

only prints the signal number to the error stream.

it_overflow/0

prints the message "Segmentation violation - maybe machine stack overflow" and makes a warm restart.

it_reset/0

makes a warm restart.