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There's the `setproctitle` in FreeBSD that is designed exactly for a process to update the information that is presented to tools such as ps.

https://man.freebsd.org/cgi/man.cgi?query=setproctitle&aprop...

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There's also getprogname(3) on a lot of systems, and the __progname variable. I seem to recall this is an area where various Unix like systems have slight variations.

prctl(PR_SET_NAME) on Linux - sets the thread name, and the name of the main thread is shown as the process name in most tools.

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