#! /bin/sh
# lock - lock the news system

# =()<. ${NEWSCONFIG-@<NEWSCONFIG>@}>()=
. ${NEWSCONFIG-/usr/local/libexec/cnews/config}

PATH=$NEWSCTL/bin:$NEWSBIN:$NEWSPATH ; export PATH
umask $NEWSUMASK

usage="Usage: $0 [-o] [-v] lockname pid [sleeptime]"
persist=y
verbose=n
for arg
do
	case "$1" in
	-o)	persist=n	;;
	-v)	verbose=y	;;
	--)	shift ; break	;;
	-*)	echo "$usage" >&2 ; exit 2	;;
	*)	break		;;
	esac
	shift
done
case "$#" in
2)	sleep=30	;;
3)	sleep="$3"	;;
*)	echo "$usage" >&2 ; exit 2	;;
esac

case "$1" in
*/*)	lock=$1 ; ltemp=$1.$$	;;
*)	lock=$NEWSCTL/$1 ; ltemp=$NEWSCTL/L.$$	;;
esac
pid="$2"

status=1
trap 'rm -f $ltemp ; trap 0 ; exit $status' 0 1 2 15
echo "$pid" >$ltemp || exit 1
while :
do
	if newslock $ltemp $lock
	then
		status=0
		touch $lock		# make the date current
		exit
	elif test ! -f $ltemp
	then
		echo "$0: \`$ltemp' disappeared!!" >&2
		exit
	elif test " $persist" = " n"
	then
		exit
	fi

	if test " $verbose" = " y"
	then
		echo 'news system locked, waiting...'
	fi
	sleep $sleep
done