SIGHUP

[o11c]

Whenever a terminal emulator is closed, the foreground process group gets a SIGHUP. If one of those processes is bash (or another shell), it then sends a new SIGHUP to all non-disowned jobs (== process groups).

For a program like GearHead, this should be handled as a graceful (but non-prompting) exit, rather than the default action (terminate without dumping core).

However, in case the event loop is not responsive, the program should still terminate - e.g. by calling alarm(5) in the signal handler.