Trap SIGINT, SIGTERM, SIGHUP for autoclosing

[Mastercuber]

While developing, it is common to send signals to the process.

One example is opening a terminal and executing e.g. listhen -w index.ts. To be able to use the terminal again, the program must be interrupted with Ctrl + C which sends a SIGINT to the process.

While the program is running (listhen -w index.ts) in a terminal and the terminal gets closed, then a SIGHUP is send to the process.

And when a process is killed the default sent signal is SIGTERM.

When receiving one of these signals (INT/TERM/HUP) the process's exit event will not get fired, and so, also no cleanup (close()) will be executed.

To properly auto-close on these specific signals, it's enough to fire an exit event when a signal is trapped.

Additional information

• Would you be willing to help implement this feature?