blob: 016882dbbc16bddda77e180f421d0bcff2ad1760 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
# probe libc's inet_pton & backtrace it with ping
# Installs a probe on libc's inet_pton function, that will use uprobes,
# then use 'perf trace' on a ping to localhost asking for just one packet
# with the a backtrace 3 levels deep, check that it is what we expect.
# This needs no debuginfo package, all is done using the libc ELF symtab
# and the CFI info in the binaries.
# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
. $(dirname $0)/lib/probe.sh
libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
trace_libc_inet_pton_backtrace() {
idx=0
expected[0]="ping[][0-9 \.:]+probe_libc:inet_pton: \([[:xdigit:]]+\)"
expected[1]=".*inet_pton[[:space:]]\($libc\)$"
case "$(uname -m)" in
s390x)
eventattr='call-graph=dwarf,max-stack=4'
expected[2]="gaih_inet.*[[:space:]]\($libc|inlined\)$"
expected[3]="(__GI_)?getaddrinfo[[:space:]]\($libc|inlined\)$"
expected[4]="main[[:space:]]\(.*/bin/ping.*\)$"
;;
*)
eventattr='max-stack=3'
expected[2]="getaddrinfo[[:space:]]\($libc\)$"
expected[3]=".*\(.*/bin/ping.*\)$"
;;
esac
file=`mktemp -u /tmp/perf.data.XXX`
perf record -e probe_libc:inet_pton/$eventattr/ -o $file ping -6 -c 1 ::1 > /dev/null 2>&1
perf script -i $file | while read line ; do
echo $line
echo "$line" | egrep -q "${expected[$idx]}"
if [ $? -ne 0 ] ; then
printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line"
exit 1
fi
let idx+=1
[ -z "${expected[$idx]}" ] && break
done
# If any statements are executed from this point onwards,
# the exit code of the last among these will be reflected
# in err below. If the exit code is 0, the test will pass
# even if the perf script output does not match.
}
# Check for IPv6 interface existence
ip a sh lo | fgrep -q inet6 || exit 2
skip_if_no_perf_probe && \
perf probe -q $libc inet_pton && \
trace_libc_inet_pton_backtrace
err=$?
rm -f ${file}
perf probe -q -d probe_libc:inet_pton
exit $err
|
