From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gustavo Zacarias <gustavo@zacarias.com.ar>
Date: Tue, 09 Dec 2014 18:48:28 -0300
Subject: [Buildroot] [PATCH 1/1] package/dnsmasq: let init script
 cleanup stale pidfile
In-Reply-To: <1418160957.1422.38.camel@posteo.de>
References: <1416068836-4053-1-git-send-email-jkrause@posteo.de>	
 <548755B0.6020002@zacarias.com.ar> <1418160957.1422.38.camel@posteo.de>
Message-ID: <54876E2C.6060208@zacarias.com.ar>
List-Id: <buildroot.busybox.net>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: buildroot@busybox.net

On 12/09/2014 06:35 PM, J?rg Krause wrote:

> I want to check in a script if the dnsmasq daemon is running by testing
> for the existence of the pid file.

Generally speaking it's bad practice to just check the pidfile to know
if some daemon is running, because if it dies unexpectedly you'll still
have the pidfile around.
You should probably use a double check of pidfile and match the process,
something like (in shell):

grep dnsmasq /proc/`cat /var/run/dnsmasq.pid`/cmdline >/dev/null 2>&1 &&
echo "YES" || echo "NO"

Regards.