Need help with rc.d script

[Edgar Pettijohn]

On Wed, Nov 08, 2017 at 11:37:37AM -0500, Ernie Luzar wrote:
> Ian Smith wrote:
> > 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
> > 
> 
> I tested with and without the enclosing ( and ) on the while loop and it 
> made no difference. No pidfile exists before the "service dynip start" 
> is issued and non exists afterwards.
> 

I don't believe the rc system can write a pidfile for you. Most of if not all
of the services being started by the rc system are written in c and take care
of writing their own pidfile. I suspect you could overcome this by writing a c
program that does so and executes your script every 10 minutes. Or some form of
pgrep perhaps.
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