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ftrace.go
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ftrace.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Tetragon
package ftrace
import (
"bufio"
"fmt"
"os"
"regexp"
"slices"
"strings"
)
func readLines(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, scanner.Err()
}
func ReadAvailFuncs(pattern string) ([]string, error) {
list, err := readLines("/sys/kernel/debug/tracing/available_filter_functions")
if err != nil {
return []string{}, err
}
for idx := range list {
line := list[idx]
// skip modules
if strings.ContainsAny(line, " ") {
list = list[:idx]
break
}
}
slices.Sort(list)
list = slices.Compact(list)
var r *regexp.Regexp
if pattern != "" {
r, err = regexp.Compile(pattern)
if err != nil {
return nil, err
}
}
final := []string{}
for idx := range list {
line := list[idx]
if strings.Contains(line, "__ftrace_invalid_address__") {
continue
}
if r != nil && !r.MatchString(line) {
continue
}
final = append(final, line)
}
if len(final) == 0 {
return []string{}, fmt.Errorf("ftrace: '%s' not found", pattern)
}
return final, nil
}