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Commit | Line | Data |
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8fc375d7 ACM |
1 | # probe libc's inet_pton & backtrace it with ping |
2 | ||
3 | # Installs a probe on libc's inet_pton function, that will use uprobes, | |
4 | # then use 'perf trace' on a ping to localhost asking for just one packet | |
5 | # with the a backtrace 3 levels deep, check that it is what we expect. | |
6 | # This needs no debuginfo package, all is done using the libc ELF symtab | |
7 | # and the CFI info in the binaries. | |
8 | ||
9 | # Arnaldo Carvalho de Melo <acme@kernel.org>, 2017 | |
10 | ||
1ad5a182 ACM |
11 | . $(dirname $0)/lib/probe.sh |
12 | ||
74f8e22c LZ |
13 | ld=$(realpath /lib64/ld*.so.* | uniq) |
14 | libc=$(echo $ld | sed 's/ld/libc/g') | |
15 | ||
8fc375d7 ACM |
16 | trace_libc_inet_pton_backtrace() { |
17 | idx=0 | |
18 | expected[0]="PING.*bytes" | |
19 | expected[1]="64 bytes from ::1.*" | |
20 | expected[2]=".*ping statistics.*" | |
21 | expected[3]=".*packets transmitted.*" | |
22 | expected[4]="rtt min.*" | |
23 | expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)" | |
74f8e22c LZ |
24 | expected[6]=".*inet_pton[[:space:]]\($libc\)$" |
25 | expected[7]="getaddrinfo[[:space:]]\($libc\)$" | |
8fc375d7 ACM |
26 | expected[8]=".*\(.*/bin/ping.*\)$" |
27 | ||
35435cd0 | 28 | perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 2>&1 | grep -v ^$ | while read line ; do |
8fc375d7 ACM |
29 | echo $line |
30 | echo "$line" | egrep -q "${expected[$idx]}" | |
31 | if [ $? -ne 0 ] ; then | |
32 | printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line" | |
33 | exit 1 | |
34 | fi | |
35 | let idx+=1 | |
36 | [ $idx -eq 9 ] && break | |
37 | done | |
38 | } | |
39 | ||
1ad5a182 | 40 | skip_if_no_perf_probe && \ |
74f8e22c | 41 | perf probe -q $libc inet_pton && \ |
8fc375d7 ACM |
42 | trace_libc_inet_pton_backtrace |
43 | err=$? | |
44 | rm -f ${file} | |
45 | perf probe -q -d probe_libc:inet_pton | |
46 | exit $err |