#!/bin/sh
# -*- mode: shell-script; coding: utf-8 -*-
#
# kernelhz
#
# Script to get the HZ value of the current kernel.
#
# Copyright (C) 2010 Elmar Hoffmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#

set -e

PROC_CONFIG='/proc/config.gz'
BOOT_CONFIG_PREFIX='/boot/config-'

function gethz () {
    sed --quiet --expression='s/^CONFIG_HZ=\([0-9]\+\)/\1/gp'
}

if [ -r "${PROC_CONFIG}" ]; then
    zcat "${PROC_CONFIG}" | gethz
    exit
else
    BOOT_CONFIG="${BOOT_CONFIG_PREFIX}$(uname --kernel-release)"

    if [ -r "${BOOT_CONFIG}" ]; then
	cat "${BOOT_CONFIG}" | gethz
	exit
    fi
fi

echo "$(basename "$0"): Error reading kernel configuration!" >&2
exit 1
