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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: in which keymap to set SIGUSR-handler
Date: Sun, 27 Aug 2023 20:59:50 +0300
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 (message from Shynur Xie on Sun, 27 Aug 2023 16:54:25 +0000)
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> From: Shynur Xie <one.last.kiss@outlook.com>
> Date: Sun, 27 Aug 2023 16:54:25 +0000
> msip_labels: 
> 
> Hi, friends.  I'm reading the elisp manual.  In 22.7.12 Miscellaneous
> System Events
> (<https://gnu.org/s/emacs/manual/html_node/elisp/Misc-Events.html>),
> there's a sample code about SIGUSR:
> 
>     (keymap-set special-event-map "<sigusr1>" 'sigusr-handler)
> 
> In 22.7.13 Event Examples
> (<https://gnu.org/s/emacs/manual/html_node/elisp/Event-Examples.html>)
> there's another one:
> 
>     (keymap-global-set "<signal> <usr1>" 'usr1-handler)
> 
> Which one should I use in my init file?  Thanks in advance.

They should both work.  Did you try?