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- #!/bin/sh
- # Copyright (c) International Business Machines Corp., 2008
- # Author: Matt Helsley <matthltc@us.ibm.com>
- #
- # This library is free software; you can redistribute it and/or
- # modify it under the terms of the GNU Lesser General Public
- # License as published by the Free Software Foundation; either
- # version 2.1 of the License, or (at your option) any later version.
- #
- # This library is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- # Lesser General Public License for more details.
- #
- # You should have received a copy of the GNU Lesser General Public
- # License along with this library; if not, write to the Free Software
- # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- #
- #
- # This bash script tests freezer code by starting a process with vfork(2).
- # vfork causes the freezer to wait until the vfork call "returns" to the
- # parent.
- #
- # we need the vfork test binary -- ensure it's been built
- CGROUPS_TESTROOT=${CGROUPS_TESTROOT:=$(dirname "$0")}
- if [ ! -x "$CGROUPS_TESTROOT/vfork" ] ; then
- print_make_message=1
- # Maintain ease-of-use backwards compatibility so Matt doesn't want to
- # hang me for the script change :].
- if type make > /dev/null ; then
- make all && print_make_message=0
- fi
- if [ $print_make_message -eq 1 ] ; then
- cat <<EOF
- ${0##*/}: ERROR: you must run \`make all' in $CGROUPS_TESTROOT before running
- this script.
- EOF
- exit 1
- fi
- fi
- . "${CGROUPS_TESTROOT}/libcgroup_freezer"
- SETS_DEFAULTS="${TCID=vfork_freeze.sh} ${TST_COUNT=1} ${TST_TOTAL=1}"
- declare -r TCID
- declare -r TST_COUNT
- declare -r TST_TOTAL
- export TCID TST_COUNT TST_TOTAL
- TMPDIR=${TMPDIR:=/tmp}
- TMPLOG="$TMPDIR/${0##*/}.$$.txt"
- # We replace the normal sample process with a process which uses vfork to
- # create new processes. The vfork'ed processes then sleep, causing the
- # parent process ($sample_proc) to enter the TASK_UNINTERRUPTIBLE state
- # for the duration of the sleep.
- function vfork_sleep()
- {
- vfork -s$sample_sleep 1 -f "$TMPLOG" &
- local rc=$?
- export vfork_proc=$!
- read sample_proc < "$TMPLOG"
- rm -f "$TMPLOG"
- export sample_proc
- return $rc
- }
- running_cgroup_test
- mount_freezer && {
- make_sample_cgroup && {
- assert_cgroup_freezer_state "THAWED" \
- "ERROR: cgroup freezer started in non-THAWED state" && {
- vfork_sleep && {
- while [ 1 ] ; do
- trap 'break' ERR
- add_sample_proc_to_cgroup
- "${CG_FILE_WRITE}" $vfork_proc >> tasks # should add to the same cgroup as above
- issue_freeze_cmd
- wait_until_frozen
- assert_sample_proc_is_frozen
- assert_task_is_frozen $vfork_proc
- issue_thaw_cmd
- wait_until_thawed
- assert_sample_proc_not_frozen
- assert_task_not_frozen $vfork_proc
- result=$FINISHED
- break
- done
- trap '' ERR
- cleanup_cgroup_test
- tst_resm TINFO " Cleaning up $0"
- # We need to kill the sample process(es).
- kill_sample_proc ; export sample_proc=$vfork_proc ; kill_sample_proc ; }
- # no inverse op needed for assert
- }
- rm_sample_cgroup ; }
- umount_freezer ; }
- rm -f "$TMPLOG"
- # Failsafe cleanup
- cleanup_freezer || /bin/true
- exit $result
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