#!@SHELL@
# Copyright (c) 2012 Alexander Vershilov <qnikst@gentoo.org>
# Released under the 2-clause BSD license.

cgroup_find_path()
{
	local OIFS n name dir result
	[ -n "$1" ] || return 0
	OIFS="$IFS"
	IFS=":"
	while read n name dir; do
		[ "$name" = "$1" ] && result="$dir"
	done < /proc/1/cgroup
	IFS="$OIFS"
	echo $result
}

# prepare values to be attached inside cgroups
cgroup_prepare()
{
	local h=$(cgroup_find_path "$1")
	cgroup="/sys/fs/cgroup/${1}${h}openrc_${RC_SVCNAME}"
	[ -d ${cgroup} ] || mkdir -p ${cgroup}
	return 0
}

cgroup_set_value()
{
	[ -f "$cgroup/${1}" -a -n "$2" ] && echo $2 > "${cgroup}/${1}"
	return 0
}

cgroup_add_process()
{
	[ -f "${cgroup}"/tasks ] && echo 0 > "${cgroup}"/tasks
	return 0
}

cgroup_set_limits()
{
	openrc_cgroup=/sys/fs/cgroup/openrc
	if [ -d ${openrc_cgroup} ]; then
		cgroup=${openrc_cgroup}/${RC_SVCNAME}
		mkdir -p ${cgroup}
		[ -f "${cgroup}"/tasks ] && echo 0 > "${cgroup}"/tasks
	fi

	if [ -d /sys/fs/cgroup/cpu ]; then
		local share

		share=${rc_cgroup_cpu_shares:-$RC_CGROUP_CPU_SHARES}
		if [ -n "$share" ]; then
			cgroup_prepare "cpu"
		cgroup_set_value "cpu.shares" $share
			cgroup_add_process
		fi
	fi
	return 0
}