1 #!/bin/bash 2 3 # Copyright (c) International Business Machines Corp., 2008 4 # Author: Matt Helsley <matthltc (at] 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 . "${CGROUPS_TESTROOT}/libcgroup_freezer" 29 SETS_DEFAULTS="${TCID=freeze_self_thaw.sh} ${TST_COUNT=1} ${TST_TOTAL=1}" 30 declare -r TCID 31 declare -r TST_COUNT 32 declare -r TST_TOTAL 33 export TCID TST_COUNT TST_TOTAL 34 35 # We replace the normal sample process with a process which sleeps, issues 36 # the freeze command, and then sleeps some more. Little does it know that it 37 # will be freezing the cgroup it's been assigned to. 38 function sleep_freeze_self_sleep() 39 { 40 ( export sample_proc=$! ; \ 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 52 running_cgroup_test 53 mount_freezer && { 54 make_sample_cgroup && { 55 assert_cgroup_freezer_state "THAWED" \ 56 "ERROR: cgroup freezer started in non-THAWED state" && { 57 58 sleep_freeze_self_sleep && { 59 60 while /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 76 done 77 trap '' ERR 78 cleanup_cgroup_test 79 tst_resm TINFO " Cleaning up $0" 80 81 # We need to stop the sample process. 82 kill_sample_proc ; } 83 # no inverse op needed for assert 84 } 85 rm_sample_cgroup ; } 86 umount_freezer ; } 87 88 # Failsafe cleanup 89 cleanup_freezer || /bin/true 90 91 exit $result 92
