1#!/bin/sh
2
3# Ensure that strace can detach from stopped processes.
4
5. "${srcdir=.}/init.sh"
6
7run_prog_skip_if_failed \
8	kill -0 $$
9
10check_prog sleep
11
12$STRACE -d -enone / > /dev/null 2> "$LOG"
13if grep -F -x "PTRACE_SEIZE doesn't work" "$LOG" > /dev/null; then
14	skip_ "PTRACE_SEIZE doesn't work"
15fi
16
17set -e
18
19rm -f "$LOG"
20./set_ptracer_any sleep $((2*$TIMEOUT_DURATION)) > "$LOG" &
21
22while ! [ -s "$LOG" ]; do
23	kill -0 $! 2> /dev/null ||
24		fail_ 'set_ptracer_any sleep failed'
25	$SLEEP_A_BIT
26done
27
28tracee_pid=$!
29kill -STOP $tracee_pid
30
31cleanup()
32{
33	set +e
34	kill $tracee_pid
35	kill -CONT $tracee_pid
36	wait $tracee_pid 2> /dev/null
37	return 0
38}
39
40rm -f "$LOG"
41$STRACE -p $tracee_pid 2> "$LOG" &
42
43while ! grep -F "Process $tracee_pid attached" "$LOG" > /dev/null; do
44	kill -0 $! 2> /dev/null || {
45		cleanup
46		dump_log_and_fail_with "$STRACE -p failed to attach"
47	}
48	$SLEEP_A_BIT
49done
50
51while ! grep -F -e '--- stopped by ' "$LOG" > /dev/null; do
52	kill -0 $! 2> /dev/null || {
53		cleanup
54		dump_log_and_fail_with "$STRACE -p missed stop notifications"
55	}
56	$SLEEP_A_BIT
57done
58
59kill -INT $!
60wait $!
61
62grep -F "Process $tracee_pid detached" "$LOG" > /dev/null || {
63	cleanup
64	dump_log_and_fail_with "$STRACE -p failed to detach"
65}
66
67if [ -f /proc/self/status ]; then
68	$SLEEP_A_BIT
69	test -d /proc/$tracee_pid || {
70		cleanup
71		dump_log_and_fail_with 'tracee died after detach'
72	}
73	grep '^State:.*T (stopped)' < /proc/$tracee_pid/status > /dev/null || {
74		grep '^State:' < /proc/$tracee_pid/status
75		cleanup
76		dump_log_and_fail_with 'tracee is not group-stopped after detach'
77	}
78fi
79
80cleanup
81exit 0
82