1 #!/bin/sh 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 process with vfork(2). 23 # vfork causes the freezer to wait until the vfork call "returns" to the 24 # parent. 25 # 26 27 # we need the vfork test binary -- ensure it's been built 28 CGROUPS_TESTROOT=${CGROUPS_TESTROOT:=$(dirname "$0")} 29 30 if [ ! -x "$CGROUPS_TESTROOT/vfork" ] ; then 31 32 print_make_message=1 33 34 # Maintain ease-of-use backwards compatibility so Matt doesn't want to 35 # hang me for the script change :]. 36 if type make > /dev/null ; then 37 make all && print_make_message=0 38 fi 39 40 if [ $print_make_message -eq 1 ] ; then 41 cat <<EOF 42 ${0##*/}: ERROR: you must run \`make all' in $CGROUPS_TESTROOT before running 43 this script. 44 EOF 45 exit 1 46 fi 47 fi 48 49 . "${CGROUPS_TESTROOT}/libcgroup_freezer" 50 SETS_DEFAULTS="${TCID=vfork_freeze.sh} ${TST_COUNT=1} ${TST_TOTAL=1}" 51 declare -r TCID 52 declare -r TST_COUNT 53 declare -r TST_TOTAL 54 export TCID TST_COUNT TST_TOTAL 55 56 TMPDIR=${TMPDIR:=/tmp} 57 TMPLOG="$TMPDIR/${0##*/}.$$.txt" 58 59 # We replace the normal sample process with a process which uses vfork to 60 # create new processes. The vfork'ed processes then sleep, causing the 61 # parent process ($sample_proc) to enter the TASK_UNINTERRUPTIBLE state 62 # for the duration of the sleep. 63 function vfork_sleep() 64 { 65 vfork -s$sample_sleep 1 -f "$TMPLOG" & 66 local rc=$? 67 export vfork_proc=$! 68 read sample_proc < "$TMPLOG" 69 rm -f "$TMPLOG" 70 export sample_proc 71 72 return $rc 73 } 74 75 running_cgroup_test 76 mount_freezer && { 77 make_sample_cgroup && { 78 assert_cgroup_freezer_state "THAWED" \ 79 "ERROR: cgroup freezer started in non-THAWED state" && { 80 81 vfork_sleep && { 82 83 while [ 1 ] ; do 84 trap 'break' ERR 85 86 add_sample_proc_to_cgroup 87 "${CG_FILE_WRITE}" $vfork_proc >> tasks # should add to the same cgroup as above 88 89 issue_freeze_cmd 90 wait_until_frozen 91 assert_sample_proc_is_frozen 92 assert_task_is_frozen $vfork_proc 93 94 issue_thaw_cmd 95 wait_until_thawed 96 assert_sample_proc_not_frozen 97 assert_task_not_frozen $vfork_proc 98 99 result=$FINISHED 100 break 101 done 102 trap '' ERR 103 cleanup_cgroup_test 104 tst_resm TINFO " Cleaning up $0" 105 106 # We need to kill the sample process(es). 107 kill_sample_proc ; export sample_proc=$vfork_proc ; kill_sample_proc ; } 108 109 # no inverse op needed for assert 110 } 111 112 rm_sample_cgroup ; } 113 umount_freezer ; } 114 115 rm -f "$TMPLOG" 116 117 # Failsafe cleanup 118 cleanup_freezer || /bin/true 119 120 exit $result 121
