# dhcpd -f -d -cf /tmp/dhcpd.conf wlp2s0b1
...
Config file: /tmp/dhcpd.conf
Database file: /var/lib/dhcp/dhcpd.leases
PID file: /var/run/dhcpd.pid
Wrote 0 leases to leases file.
Listening on LPF/wlp2s0b1/08:3e:8e:aa:65:d1/192.168.1.0/24
Sending on   LPF/wlp2s0b1/08:3e:8e:aa:65:d1/192.168.1.0/24
Sending on   Socket/fallback/fallback-net
Server starting service.

OK that's great.

However if one then hits ^C.

1. There is not even a peep. No message that the service is ending. Not
on STDERR, not in journalctl.

(2. The service indeed ends (pidof dhcpd finds none), however the pid
files aren't cleaned up. Perhaps do that.)

Same problem with hangup,
# killall -1 dhcpd

I'm saying that there are tons of messages saying it is starting, but
not even one saying it is ending.

Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)