1#!/bin/bash 2 3# Copyright (c) International Business Machines Corp., 2008 4# Author: Matt Helsley <matthltc@us.ibm.com> 5# 6# This library is free software; you can redistribute it and/or 7# modify it under the terms of the GNU Lesser General Public 8# License as published by the Free Software Foundation; either 9# version 2.1 of the License, or (at your option) any later version. 10# 11# This library is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14# Lesser General Public License for more details. 15# 16# You should have received a copy of the GNU Lesser General Public 17# License along with this library; if not, write to the Free Software 18# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19# 20 21# 22# This bash script tests freezer code by starting a long subshell process. 23# The subshell process sleeps and then freezes the control group it is a 24# part of. We then thaw the subshell process. We expect the unthawed subshell 25# process to need cleanup afterwards (allows us to test successfull thawing). 26# 27 28. "${CGROUPS_TESTROOT}/libcgroup_freezer" 29SETS_DEFAULTS="${TCID=freeze_self_thaw.sh} ${TST_COUNT=1} ${TST_TOTAL=1}" 30declare -r TCID 31declare -r TST_COUNT 32declare -r TST_TOTAL 33export TCID TST_COUNT TST_TOTAL 34 35# We replace the normal sample process with a process which sleeps, issues 36# the freeze command, and then sleeps some more. Little does it know that it 37# will be freezing the cgroup it's been assigned to. 38function sleep_freeze_self_sleep() 39{ 40 ( export sample_proc=$! ; \ 41 add_sample_proc_to_cgroup ; \ 42 tst_resm TINFO " $sample_proc freezing itself" ; \ 43 "${CG_FILE_WRITE}" "${FREEZE}" > freezer.state ; \ 44 tst_resm TINFO " $sample_proc thawed successfully" ; \ 45 exec sleep $sample_sleep ) & 46 local rc=$? 47 export sample_proc=$! 48 49 return $rc 50} 51 52running_cgroup_test 53mount_freezer && { 54make_sample_cgroup && { 55assert_cgroup_freezer_state "THAWED" \ 56 "ERROR: cgroup freezer started in non-THAWED state" && { 57 58sleep_freeze_self_sleep && { 59 60while /bin/true ; do 61 trap 'break' ERR 62 tst_resm TINFO " Waiting for $sample_proc to freeze itself" 63 64 # WAIT until FROZEN (see FREEZE self above) 65 wait_until_frozen 66 assert_sample_proc_is_frozen 67 68 # THAW 69 issue_thaw_cmd 70 wait_until_thawed 71 assert_sample_proc_exists 72 assert_sample_proc_not_frozen 73 74 result=$FINISHED 75 break 76done 77trap '' ERR 78cleanup_cgroup_test 79tst_resm TINFO " Cleaning up $0" 80 81# We need to stop the sample process. 82kill_sample_proc ; } 83# no inverse op needed for assert 84} 85rm_sample_cgroup ; } 86umount_freezer ; } 87 88# Failsafe cleanup 89cleanup_freezer || /bin/true 90 91exit $result 92