tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ftrace/test.d/ftrace/fgraph-retval.tc
Extension
.tc
Size
1196 bytes
Lines
45
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - function graph print function return value
# requires: options/funcgraph-retval options/funcgraph-retval-hex function_graph:tracer

# Make sure that funcgraph-retval works

fail() { # msg
    echo $1
    exit_fail
}

disable_tracing
clear_trace

# get self PID, can not use $$, because it is PPID
read PID _ < /proc/self/stat

[ -f set_ftrace_filter ] && echo proc_reg_write > set_ftrace_filter
[ -f set_ftrace_pid ] && echo ${PID} > set_ftrace_pid
echo function_graph > current_tracer
echo 1 > options/funcgraph-retval

set +e
enable_tracing
echo > /proc/interrupts
disable_tracing
set -e

: "Test printing the error code in signed decimal format"
echo 0 > options/funcgraph-retval-hex
count=`cat trace | grep 'proc_reg_write' | grep -e '=-5 ' -e '= -5 '  | wc -l`
if [ $count -eq 0 ]; then
    fail "Return value can not be printed in signed decimal format"
fi

: "Test printing the error code in hexadecimal format"
echo 1 > options/funcgraph-retval-hex
count=`cat trace | grep 'proc_reg_write' | grep 'fffffffb' | wc -l`
if [ $count -eq 0 ]; then
    fail "Return value can not be printed in hexadecimal format"
fi

exit 0

Annotation

Implementation Notes