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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Interrupting computations using signals
Date: Mon, 24 May 2021 15:53:53 +0300
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> From: Daniel Mendler <mail@daniel-mendler.de>
> Date: Mon, 24 May 2021 14:32:05 +0200
> 
> If Emacs is running in GUI mode, I can interrupt computations by
> pressing `C-g` (keyboard-quit). Is there also a possibility to submit
> such an interrupt from outside, via signals or via another mechanism?

Yes, read about sigusr1 and sigusr2 in the ELisp manual.

> I've read something in the manual about SIGUSR1/SIGUSR2 but I could not
> get these handlers to work in an Emacs running in daemon or batch mode.

Show us the code.