Allow daemons to raise a signal upon autoexit

[shikokuchuo]

Closes #87

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d53637f) 99.81% compared to head (1e71848) 99.81%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files           8        8           
  Lines         542      542           
=======================================
  Hits          541      541           
  Misses          1        1           

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