tools/netconsole: make a bit more robust

[u-boot.git] / tools / netconsole

#!/bin/sh

usage() {
	(
	echo "Usage: $0 <board IP> [board port]"
	echo ""
	echo "If port is not specified, '6666' will be used"
	[ -z "$*" ] && exit 0
	echo ""
	echo "ERROR: $*"
	exit 1
	) 1>&2
	exit $?
}

while [ -n "$1" ] ; do
	case $1 in
		-h|--help) usage;;
		--)        break;;
		-*)        usage "Invalid option $1";;
		*)         break;;
	esac
	shift
done

ip=$1
port=${2:-6666}

if [ -z "${ip}" ] || [ -n "$3" ] ; then
	usage "Invalid number of arguments"
fi

for nc in netcat nc ; do
	type ${nc} >/dev/null 2>&1 && break
done

trap "stty icanon echo intr ^C" 0 2 3 5 10 13 15
echo "NOTE: the interrupt signal (normally ^C) has been remapped to ^T"

stty -icanon -echo intr ^T
(
while ${nc} -u -l -p ${port} < /dev/null ; do
	:
done
) &
pid=$!
${nc} -u ${ip} ${port}
kill ${pid} 2>/dev/null