1#!/bin/sh
2# Use vfs_getname probe to get syscall args filenames
3
4# Uses the 'perf test shell' library to add probe:vfs_getname to the system
5# then use it with 'perf record' using 'touch' to write to a temp file, then
6# checks that that was captured by the vfs_getname probe in the generated
7# perf.data file, with the temp file name as the pathname argument.
8
9# SPDX-License-Identifier: GPL-2.0
10# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
11
12# shellcheck source=lib/probe.sh
13. "$(dirname "$0")/lib/probe.sh"
14
15skip_if_no_perf_probe || exit 2
16
17# shellcheck source=lib/probe_vfs_getname.sh
18. "$(dirname "$0")/lib/probe_vfs_getname.sh"
19
20record_open_file() {
21	echo "Recording open file:"
22	# Check presence of libtraceevent support to run perf record
23	skip_no_probe_record_support "probe:vfs_getname*"
24	[ $? -eq 2 ] && return 2
25	perf record -o ${perfdata} -e probe:vfs_getname\* touch $file
26}
27
28perf_script_filenames() {
29	echo "Looking at perf.data file for vfs_getname records for the file we touched:"
30	perf script -i ${perfdata} | \
31	grep -E " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname[_0-9]*: +\([[:xdigit:]]+\) +pathname=\"${file}\""
32}
33
34add_probe_vfs_getname || skip_if_no_debuginfo
35err=$?
36if [ $err -ne 0 ] ; then
37	exit $err
38fi
39
40perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
41file=$(mktemp /tmp/temporary_file.XXXXX)
42
43record_open_file && perf_script_filenames
44err=$?
45rm -f ${perfdata}
46rm -f ${file}
47cleanup_probe_vfs_getname
48exit $err
49