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locking for munin

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git-svn-id: file:///svn/unbound/trunk@1253 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2008-09-18 11:49:09 +00:00
parent 9d6df1964b
commit a14c4fa6e5
1 changed files with 20 additions and 0 deletions
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20
contrib/unbound_munin_
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@ -98,6 +98,7 @@ conf=${unbound_conf:-/usr/local/etc/unbound/unbound.conf}
ctrl=${unbound_control:-/usr/local/sbin/unbound-control}
warn=${spoof_warn:-1000}
crit=${spoof_crit:-100000}
lock=$state.lock
# number of seconds between polling attempts.
# makes the statefile hang around for at least this many seconds,
@ -117,20 +118,39 @@ get_value ( ) {
# download the state from the unbound server.
get_state ( ) {
# obtain lock for fetching the state
# because there is a race condition in fetching and writing to file
i=0
while test ! -f $lock || test "`cat $lock`" != $$; do
while test -f $lock; do
# wait
i=`expr $i + 1`
if test $i -gt 100000; then
echo "error locking $lock" "=" `cat $lock`
rm -f $lock
exit 1
fi
done
# try to get it
echo $$ >$lock
done
# do not refetch if the file exists and only LEE seconds old
if test -f $state; then
now=`date +%s`
get_value "time.now"
value="`echo $value | sed -e 's/\..*$//'`"
if test $now -lt `expr $value + $lee`; then
rm -f $lock
return
fi
fi
$ctrl -c $conf stats > $state
if test $? -ne 0; then
echo "error retrieving data from unbound server"
rm -f $lock
exit 1
fi
rm -f $lock
}
if test "$1" = "autoconf" ; then