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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-only
#
# Attach a task to a cgroup via cgroup_attach_task()
#
# Copyright (c) 2023 Oracle and/or its affiliates.
# Author: Tom Hromatka <tom.hromatka@oracle.com>
#
from cgroup import Cgroup as CgroupCli
from libcgroup import Cgroup, Version
from cgroup import CgroupVersion
import ftests
import consts
import sys
import os
CGNAME = '052cgattachcg'
# Which controller isn't all that important, but it is important that we
# have a cgroup v2 controller
CONTROLLER = 'cpu'
def prereqs(config):
result = consts.TEST_PASSED
cause = None
if config.args.container:
result = consts.TEST_SKIPPED
cause = 'This test cannot be run within a container'
return result, cause
if CgroupVersion.get_version(CONTROLLER) != CgroupVersion.CGROUP_V2:
result = consts.TEST_SKIPPED
cause = 'This test requires cgroup v2'
return result, cause
def setup(config):
cg = Cgroup(CGNAME, Version.CGROUP_V2)
cg.add_controller(CONTROLLER)
cg.create()
def test(config):
result = consts.TEST_PASSED
cause = None
cg = Cgroup(CGNAME, Version.CGROUP_V2)
cg.add_controller(CONTROLLER)
cg.attach()
found = False
pids = CgroupCli.get_pids_in_cgroup(config, CGNAME, CONTROLLER)
for pid in pids:
if pid == os.getpid():
# our process was successfully added to the cgroup
found = True
if not found:
result = consts.TEST_FAILED
cause = 'Could not find pid {} in cgroup {}'.format(os.getpid(), CGNAME)
return result, cause
# now let's attach this process to the root cgroup and ensure we no longer
# are in CGNAME
cg.attach(root_cgroup=True)
found = False
pids = CgroupCli.get_pids_in_cgroup(config, CGNAME, CONTROLLER)
for pid in pids:
if pid == os.getpid():
# our process was successfully added to the cgroup
found = True
if found:
result = consts.TEST_FAILED
cause = 'pid {} was erroneously found in cgroup {}'.format(os.getpid(), CGNAME)
return result, cause
def teardown(config, result):
cg = Cgroup(CGNAME, Version.CGROUP_V2)
try:
cg.delete()
except RuntimeError:
pass
def main(config):
[result, cause] = prereqs(config)
if result != consts.TEST_PASSED:
return [result, cause]
try:
result = consts.TEST_FAILED
setup(config)
[result, cause] = test(config)
finally:
teardown(config, result)
return [result, cause]
if __name__ == '__main__':
config = ftests.parse_args()
# this test was invoked directly. run only it
config.args.num = int(os.path.basename(__file__).split('-')[0])
sys.exit(ftests.main(config))
# vim: set et ts=4 sw=4:
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