graceful shutdown of non-interactive Elisp program

[Paul Pogonyshev <pogonyshev@gmail.com>]

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Hi,

I'm trying to make a Elisp program that is run in a non-interactive mode,
i.e. essentially as `emacs --batch --load myfile.el'. A normal way to
shutdown terminal programs is with C-c, which is expected to be "graceful"
shutdown, e.g. the program still has a chance to save files etc.

However, with Elisp I'm not sure how to achieve that except for constantly
modifying `kill-emacs-hook', which would be a nightmare from coding
perspective.

Naively I would expect this print "GOING DOWN" when aborted with C-c:

    $ emacs --batch --eval "(unwind-protect (while t) (message \"GOING
DOWN\"))"

For example, Python's handler of SIGINT raises an exception within the
program, which unwinds the stack as usual and, unless caught, cause program
termination after cleaning up as expected (e.g. running all `finally'
clauses and closing all `with' context managers). However, in Elisp, as I
understand, there is no way to have a say in handling SIGINT other than
adding a function to `kill-emacs-hook'.

Is that correct, or am I missing something here?

Paul

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