strace/tests/detach-stopped.test

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#!/bin/sh
#
# Ensure that strace can detach from stopped processes.
#
# Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
. "${srcdir=.}/init.sh"
run_prog_skip_if_failed \
kill -0 $$
check_prog sleep
$STRACE -d -enone / > /dev/null 2> "$LOG"
if grep -x "[^:]*strace: PTRACE_SEIZE doesn't work" "$LOG" > /dev/null; then
skip_ "PTRACE_SEIZE doesn't work"
fi
set -e
rm -f "$LOG"
./set_ptracer_any sleep $((2*$TIMEOUT_DURATION)) > "$LOG" &
while ! [ -s "$LOG" ]; do
kill -0 $! 2> /dev/null ||
fail_ 'set_ptracer_any sleep failed'
$SLEEP_A_BIT
done
tracee_pid=$!
kill -STOP $tracee_pid
cleanup()
{
set +e
kill $tracee_pid
kill -CONT $tracee_pid
wait $tracee_pid 2> /dev/null
return 0
}
rm -f "$LOG"
$STRACE -p $tracee_pid 2> "$LOG" &
while ! grep -F "Process $tracee_pid attached" "$LOG" > /dev/null; do
kill -0 $! 2> /dev/null || {
cleanup
dump_log_and_fail_with "$STRACE -p failed to attach"
}
$SLEEP_A_BIT
done
while ! grep -F -e '--- stopped by ' "$LOG" > /dev/null; do
kill -0 $! 2> /dev/null || {
cleanup
dump_log_and_fail_with "$STRACE -p missed stop notifications"
}
$SLEEP_A_BIT
done
kill -INT $!
wait $!
grep -F "Process $tracee_pid detached" "$LOG" > /dev/null || {
cleanup
dump_log_and_fail_with "$STRACE -p failed to detach"
}
if [ -f /proc/self/status ]; then
$SLEEP_A_BIT
test -d /proc/$tracee_pid || {
cleanup
dump_log_and_fail_with 'tracee died after detach'
}
grep '^State:.*T (stopped)' < /proc/$tracee_pid/status > /dev/null || {
grep '^State:' < /proc/$tracee_pid/status
cleanup
dump_log_and_fail_with 'tracee is not group-stopped after detach'
}
fi
cleanup
exit 0