1#!/bin/sh
2# Use vfs_getname probe to get syscall args filenames (exclusive)
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 "$0")/lib/probe.sh"
14
15skip_if_no_perf_probe || exit 2
16[ "$(id -u)" = 0 ] || exit 2
17
18# shellcheck source=lib/probe_vfs_getname.sh
19. "$(dirname "$0")/lib/probe_vfs_getname.sh"
20
21record_open_file() {
22	echo "Recording open file:"
23	# Check presence of libtraceevent support to run perf record
24	skip_no_probe_record_support "probe:vfs_getname*"
25	if [ $? -eq 2 ]; then
26		echo "WARN: Skipping test record_open_file. No libtraceevent support"
27		return 2
28	fi
29	perf record -o ${perfdata} -e probe:vfs_getname\* touch $file
30}
31
32perf_script_filenames() {
33	echo "Looking at perf.data file for vfs_getname records for the file we touched:"
34	perf script -i ${perfdata} | \
35	grep -E " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname[_0-9]*: +\([[:xdigit:]]+\) +pathname=\"${file}\""
36}
37
38add_probe_vfs_getname || skip_if_no_debuginfo
39err=$?
40if [ $err -ne 0 ] ; then
41	exit $err
42fi
43
44perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
45file=$(mktemp /tmp/temporary_file.XXXXX)
46
47record_open_file && perf_script_filenames
48err=$?
49rm -f ${perfdata}
50rm -f ${file}
51cleanup_probe_vfs_getname
52exit $err
53