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There are some best practices on how unix daemons should behave. Some of these are not met on Kea. You can read little old but still up-to-date howto document for general overview how to linux daemons should work: http://www.netzmafia.de/skripten/unix/linux-daemon-howto.html

In particular:

• Kea should put its daemons into background, not stay foreground
• daemons should unbind their stdin, stdout and stderr from current streams (i.e. terminal) and bind them to /dev/null or alternatively stdout and stderr may be binded to log file
• daemons should release their controlling terminal (setsid) because they don't communicate with users this way
• daemons should change current working directory to root (/) not to lock any possible mount points
• daemons should ignore all signals which is not significant to it (i.e. SIGPIPE)