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I have a complex application with USR1 and USR2 already defined as having a well-defined and not replaceable purpose.

There are tons of different signals in linux. Might there be another one (maybe a deprecated one) that can be safely used without expecting the OS to trigger destructive behavior?

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    It really depends on your application, and on what you want to do. For example if your application is a daemon and you want to tell it to print its status to a file, you could use SIGHUP.
    – Satō Katsura
    Sep 2, 2016 at 7:34
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    SIGHUP is also commonly used to reload a daemon's configuration.
    – Michael Daffin
    Sep 2, 2016 at 9:57

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In that case:

you could use SIGHUP

At least using Kubuntu those available signals can also be used: SIGRTMIN SIGRTMAX SIGRTMIN+1 SIGRTMIN+2 and similar ones that can be seen using kill -l.

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