1#!/bin/sh
2#
3# Ensure that strace can detach from stopped processes.
4#
5# Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
6# Copyright (c) 2014-2017 The strace developers.
7# All rights reserved.
8#
9# Redistribution and use in source and binary forms, with or without
10# modification, are permitted provided that the following conditions
11# are met:
12# 1. Redistributions of source code must retain the above copyright
13#    notice, this list of conditions and the following disclaimer.
14# 2. Redistributions in binary form must reproduce the above copyright
15#    notice, this list of conditions and the following disclaimer in the
16#    documentation and/or other materials provided with the distribution.
17# 3. The name of the author may not be used to endorse or promote products
18#    derived from this software without specific prior written permission.
19#
20# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31. "${srcdir=.}/init.sh"
32
33run_prog_skip_if_failed \
34	kill -0 $$
35
36check_prog sleep
37
38$STRACE -d -enone / > /dev/null 2> "$LOG"
39if grep -x "[^:]*strace: PTRACE_SEIZE doesn't work" "$LOG" > /dev/null; then
40	skip_ "PTRACE_SEIZE doesn't work"
41fi
42
43set -e
44
45> "$LOG"
46../set_ptracer_any sleep $((2*$TIMEOUT_DURATION)) > "$LOG" &
47
48while ! [ -s "$LOG" ]; do
49	kill -0 $! 2> /dev/null ||
50		fail_ 'set_ptracer_any sleep failed'
51	$SLEEP_A_BIT
52done
53
54tracee_pid=$!
55kill -STOP $tracee_pid
56
57cleanup()
58{
59	set +e
60	kill $tracee_pid
61	kill -CONT $tracee_pid
62	wait $tracee_pid 2> /dev/null
63	return 0
64}
65
66> "$LOG"
67$STRACE -p $tracee_pid 2> "$LOG" &
68
69while ! grep -F "Process $tracee_pid attached" "$LOG" > /dev/null; do
70	kill -0 $! 2> /dev/null || {
71		cleanup
72		dump_log_and_fail_with "$STRACE -p failed to attach"
73	}
74	$SLEEP_A_BIT
75done
76
77while ! grep -F -e '--- stopped by ' "$LOG" > /dev/null; do
78	kill -0 $! 2> /dev/null || {
79		cleanup
80		dump_log_and_fail_with "$STRACE -p missed stop notifications"
81	}
82	$SLEEP_A_BIT
83done
84
85kill -INT $!
86wait $!
87
88grep -F "Process $tracee_pid detached" "$LOG" > /dev/null || {
89	cleanup
90	dump_log_and_fail_with "$STRACE -p failed to detach"
91}
92
93if [ -f /proc/self/status ]; then
94	$SLEEP_A_BIT
95	test -d /proc/$tracee_pid || {
96		cleanup
97		dump_log_and_fail_with 'tracee died after detach'
98	}
99	grep_pid_status "$tracee_pid" '^State:.*T (stopped)' > /dev/null || {
100		grep_pid_status "$tracee_pid" '^State:'
101		cleanup
102		dump_log_and_fail_with 'tracee is not group-stopped after detach'
103	}
104fi
105
106cleanup
107exit 0
108