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. $(dirname $0)/lib/probe.sh
13
14skip_if_no_perf_probe || exit 2
15
16. $(dirname $0)/lib/probe_vfs_getname.sh
17
18record_open_file() {
19	echo "Recording open file:"
20	perf record -o ${perfdata} -e probe:vfs_getname\* touch $file
21}
22
23perf_script_filenames() {
24	echo "Looking at perf.data file for vfs_getname records for the file we touched:"
25	perf script -i ${perfdata} | \
26	egrep " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname[_0-9]*: +\([[:xdigit:]]+\) +pathname=\"${file}\""
27}
28
29add_probe_vfs_getname || skip_if_no_debuginfo
30err=$?
31if [ $err -ne 0 ] ; then
32	exit $err
33fi
34
35perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
36file=$(mktemp /tmp/temporary_file.XXXXX)
37
38record_open_file && perf_script_filenames
39err=$?
40rm -f ${perfdata}
41rm -f ${file}
42cleanup_probe_vfs_getname
43exit $err
44