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Date: Thu, 9 Nov 2017 01:23:22 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Ernie Luzar <luzar722@gmail.com>
cc: freebsd-questions@freebsd.org
Subject: Re: Need help with rc.d script
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On Tue, 7 Nov 2017 13:11:36 -0500, Ernie Luzar wrote:

 > Thanks Ian,
 > Ending the while loop with "done &" worked.

The one with or without the enclosing ( and ) to force a subshell?

 > When I issue dynip from the command line it runs as a daemon but I have to
 > use the kill command to stop it.
 > 
 > This is my rc.d script for dynip script. issuing "service dynip start" works
 > but "service dynip stop" gives message saying
 > dynip not running? (Check /var/run/dynip.pid). Well ps ax shows it is running
 > and I have to use the kill command to stop it.

Things to check:

 . after 'start' does /var/run/dynip.pid exist while it's running??
 . if so, does it contain the same PID as 'ps ax' shows for dynip?
 . does 'ps ax' show a different PID for the subshell, if there is one?
 . Does /var/run/dynip.pid still exist after running 'stop'?

i.e. is the PID needed for kill the same as that in /var/run/dynip.pid?

 > Here is my rc.d script. What am I missing to populate the dynip.pid file so
 > "service dynip stop" command will work?
 >
 > #!/bin/sh
 > #
 > #
 > # PROVIDE: dynip
 > # REQUIRE: LOGIN
 > # KEYWORD: nojail shutdown
 > #
 > # Add the following line to /etc/rc.conf to enable dynip:
 > #
 > # dynip_enable="YES"
 > #
 > 
 > . /etc/rc.subr
 > name="dynip"
 > rcvar=dynip_enable
 > command="/usr/local/sbin/${name}"
 > pidfile="/var/run/${name}.pid"
 > load_rc_config ${name}
 > run_rc_command "$1"

I've very little knowledge of the detailed behaviour of the rc system.  
Let's see how the above questions might inform before speculating ..

cheers, Ian