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package debugfs
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strings"
)
// Return tracepoints with 'unsigned int fd', which are I/O tracepoints on FDs
func TracepointsWithFd() ([]string, error) {
return tracepointsWith("unsigned int fd")
}
func tracepointsWith(field string) ([]string, error) {
var tracepoints []string
matches, err := filepath.Glob("/sys/kernel/debug/tracing/events/syscalls/*/format")
if err != nil {
return tracepoints, err
}
if len(matches) == 0 {
return tracepoints, fmt.Errorf("Unable to gather tracepoints with FDs")
}
for _, formatPath := range matches {
has, err := hasField(formatPath, field)
if err != nil {
return tracepoints, err
}
if !has {
continue
}
tracepoints = append(tracepoints, filepath.Base(filepath.Dir(formatPath)))
}
return tracepoints, nil
}
func hasField(formatPath, field string) (bool, error) {
file, err := os.Open(formatPath)
if err != nil {
return false, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if strings.Contains(line, fmt.Sprintf("field:%s;", field)) {
return true, nil
}
}
return false, nil
}
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