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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 21:50:32 +0300
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 (message from Shynur Xie on Sun, 27 Aug 2023 18:18:37 +0000)
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> From: Shynur Xie <one.last.kiss@outlook.com>
> CC: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> Date: Sun, 27 Aug 2023 18:18:37 +0000
> 
> The second one doesn't work:
> 
>     (keymap-global-set "<signal> <usr1>"
>                        (lambda ()
>                          (interactive)
>                          (message "-*-*-*-")))
>     (signal-process (emacs-pid) 'sigusr1)
> 
> Am I missing something?

If you are sure you did everything right, submit a bug report.