Date: Wed, 8 Nov 2017 04:49:14 +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 Message-ID: <20171108043726.N72828@sola.nimnet.asn.au> In-Reply-To: <20171108021900.W9710@sola.nimnet.asn.au> References: <mailman.444.1510052978.1530.freebsd-questions@freebsd.org> <20171108021900.W9710@sola.nimnet.asn.au>
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On Wed, 8 Nov 2017 02:38:54 +1100, Ian Smith wrote:
> > # This is the continuous loop checking the current ip address to
> > # to determin if it changed.
> > while [ 1 ]; do
>
> More portable (for any shell) is 'while true; do' ..
>
> > # Get the IP address assigned to that NIC device name.
> > nic_ip="$(ifconfig $nic_devicename inet | \
> > grep -o "inet.*" | cut -d ' ' -f 2)"
More problematic and unnecessary double quotes I missed before ..
> > #echo "nic_ip2 = ${nic_ip}"
> >
> > if [ "${prev_ip}" != "${nic_ip}" ]; then
> > # Update dynamic DNS hosting site with new ip address.
> > website="https://dynamicdns.park-your-domain.com/update?"
> > dyn_host="host=home-fbsd&domain=host.xxxxxxx.com"
> > password="&password=a3e0ffc2274746b29ceaf126d59e51c1"
> > url="$website$dyn_host$password"
> > #echo "$url"
> > /usr/local/bin/wget -O /var/log/namecheap.dynip.update.log -q "$url"
> > #echo "rtn-code = $?"
> > if [ $? -ne 0 ]; then
> > echo "Error: /usr/local/bin/wget command failed."
> > exit 3
> > fi
> > #echo "${nic_ip}" > ${prev_ip_file}
> > prev_ip="${nic_ip}"
> > fi
> > sleep ${elapse_time}
> > done
>
> You do NOT need to use daemon, all you need to do is replace done with
>
> done &
>
> and perhaps test to be clear that's working,
>
> echo "dynip script done"
> exit 0
>
> So that the script and so run_rc_command will complete, leaving the
> "while .. done &" subshell running in background.
On second thoughts, 'while .. done' in this particular context might not
run in a subshell. If the above method doesn't work, force that section
to run in a specific subshell in background, like so:
( while true; do
[..]
done ) &
echo that worked
exit 0
cheers, Ian
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