signals

TF catches several signals from the operating system and handles them specially:

SIGINT (normally generated by typing ^C): Aborts any running macro or blocking hostname resolution or connect, and, if interactive is on, offers a menu of choices:
C) continue tf; X) exit; T) disable triggers; P) kill processes. If interactive is off, tf exits without prompting.
SIGQUIT (normally generated by typing ^\): If interactive is on, TF prompts the user to quit. If the answer is 'y', or interactive is off, TF will dump a core file if configured to do so, and exit.
SIGTERM: Calls the SIGTERM hook, and then exits TF.
SIGHUP (normally generated when the terminal disconnects): Calls the SIGHUP hook, and then exits TF if SIGHUP was not ignored when tf was started.
SIGUSR1: Calls the SIGUSR1 hook. TF does not exit.
SIGUSR2: Calls the SIGUSR2 hook. TF does not exit.
SIGTSTP (normally generated by typing ^Z): Suspends the TF process, like /suspend.
SIGWINCH (normally generated by resizing the terminal): Redraws the screen, and calls the RESIZE hook.