#!/bin/sh
#

#
# putlock -- create one or more lockfiles, based on rtc
#


cleanup() {
	if [ "$LOCKFILES" != "" ]; then
		rm $LOCKFILES
	fi

	trap - $trapsignals
	if [ "$cmdpid" != "" ]; then
		kill $cmdpid >/dev/null 2>&1
	fi

	if [ "$alarmpid" != "" ]; then
		kill $alarmpid >/dev/null 2>&1
	fi
	}

setalarm() {
	trap sigalrmhandler 14
	sleep $1  &&  kill -s 14 $$  &
	alarmpid=$!
	}  

sigalrmhandler() {
	if [ "$silent" = "no" ]; then
		echo $program: alarm clock >&2
	fi

	alarmpid=''
	if [ "$cmdpid" != '' ]; then
		kill -ALRM $cmdpid
	fi

	exit 1
	}



program=`basename $0`
trapsignals="0 1 2 3 15"

TIMEOUT=10

options=`getopt dt: $*`  ||  exit 1
set -- $options
while true; do
	opt=$1
	case $opt in
	  -d)
		set -x
		shift
		;;

	  -t)
	  	TIMEOUT=$2
		shift 2
		;;

	  --)
	  	shift
		break
		;;

	  -*)
	  	echo $program: unknown option: $opt 1>&2
		exit 1
		;;

	  *)
		break
		;;

	esac
done



#
# Check parameters ...
#

if [ "$#" '<' 1 ]; then
	echo usage: $program '[<options>] <filename> [...]' 1>&2
	exit 1
fi


#
# ... capture some signals and set clock.
#

trap 'cleanup; exit' $trapsignals
setalarm $TIMEOUT


#
# Put the lockfiles
#

for file in $*; do
	lock=$file.lock
	while (! ln -s $file $lock >/dev/null 2>&1); do
		sleep 1
	done
	LOCKFILES="$LOCKFILES $lock"
done


#
# Turn off the alarm and wait for input, send ok to caller
# and wait for termination.
#

kill $alarmpid
echo OK

while read line; do
	x=x		# do nothing
done

exit 0