Stopping ptpd takes about 30 seconds.

This:

# time systemctl stop ptpd

real    0m30.027s
user    0m0.003s
sys    0m0.003s

The /etc/init.d/ptpd is using the wrong lock file, so it uses the
timeout path of the ptpd bash script when invoking start-stop-daemon.

It should use /var/run/ptpd2.lock but it's currently checking
/var/run/ptpd.pid.

On my Ubuntu 22.04 system when ptpd is running I see:

# more /run/ptpd2.lock
1335821

# ps -ef | grep ptp
root     1335821       1  0 18:28 ?        00:00:00 /usr/sbin/ptpd
--interface=enp94s0f1np1 --config-file=/etc/ptpd2.conf
root     1336368 1314671  0 18:28 pts/0    00:00:00 grep --color=auto ptp

I tested using the patch below with Ubuntu 22.04 and with it in place
the stop takes less than a second, this:

# time systemctl stop ptpd

real    0m0.056s
user    0m0.005s
sys    0m0.000s


$ git diff
diff --git a/debian/ptpd.init b/debian/ptpd.init
index 47bbe25..7d70062 100755
--- a/debian/ptpd.init
+++ b/debian/ptpd.init
@@ -15,8 +15,9 @@
  PATH=/sbin:/usr/sbin:/bin:/usr/bin
  DESC="Precision Time Protocol daemon"
  NAME=ptpd
+NAME2=ptpd2
  DAEMON=/usr/sbin/$NAME
-PIDFILE=/var/run/$NAME.pid
+PIDFILE=/var/run/$NAME2.lock
  SCRIPTNAME=/etc/init.d/$NAME

  # Exit if the package is not installed