#!/bin/sh
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#
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# Ensure that strace can detach from stopped processes.
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#
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# Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
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# Copyright (c) 2014-2017 The strace developers.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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. "${srcdir=.}/init.sh"
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run_prog_skip_if_failed \
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kill -0 $$
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check_prog sleep
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$STRACE -d -enone / > /dev/null 2> "$LOG"
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if grep -x "[^:]*strace: PTRACE_SEIZE doesn't work" "$LOG" > /dev/null; then
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skip_ "PTRACE_SEIZE doesn't work"
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fi
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set -e
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> "$LOG"
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../set_ptracer_any sleep $((2*$TIMEOUT_DURATION)) > "$LOG" &
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while ! [ -s "$LOG" ]; do
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kill -0 $! 2> /dev/null ||
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fail_ 'set_ptracer_any sleep failed'
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$SLEEP_A_BIT
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done
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tracee_pid=$!
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kill -STOP $tracee_pid
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cleanup()
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{
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set +e
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kill $tracee_pid
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kill -CONT $tracee_pid
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wait $tracee_pid 2> /dev/null
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return 0
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}
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> "$LOG"
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$STRACE -p $tracee_pid 2> "$LOG" &
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while ! grep -F "Process $tracee_pid attached" "$LOG" > /dev/null; do
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kill -0 $! 2> /dev/null || {
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cleanup
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dump_log_and_fail_with "$STRACE -p failed to attach"
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}
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$SLEEP_A_BIT
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done
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while ! grep -F -e '--- stopped by ' "$LOG" > /dev/null; do
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kill -0 $! 2> /dev/null || {
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cleanup
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dump_log_and_fail_with "$STRACE -p missed stop notifications"
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}
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$SLEEP_A_BIT
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done
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kill -INT $!
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wait $!
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grep -F "Process $tracee_pid detached" "$LOG" > /dev/null || {
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cleanup
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dump_log_and_fail_with "$STRACE -p failed to detach"
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}
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if [ -f /proc/self/status ]; then
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$SLEEP_A_BIT
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test -d /proc/$tracee_pid || {
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cleanup
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dump_log_and_fail_with 'tracee died after detach'
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}
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grep_pid_status "$tracee_pid" '^State:.*T (stopped)' > /dev/null || {
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grep_pid_status "$tracee_pid" '^State:'
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cleanup
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dump_log_and_fail_with 'tracee is not group-stopped after detach'
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}
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fi
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cleanup
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exit 0
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