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package ftrace
import (
"fmt"
"io/ioutil"
"os"
"strings"
)
// Available returns true if FTRACE is available on this system, otherwise false.
func Available() bool {
return trim(readFileOr(enabledStatusFile, "0")) == "1"
}
func trim(s string) string {
return strings.Trim(s, "\r\n\t ")
}
func readFileOr(filename string, deflt string) string {
data, err := ioutil.ReadFile(filename)
if err != nil {
return deflt
}
return string(data)
}
func writeFile(filename string, data string) error {
return ioutil.WriteFile(filename, []byte(data), 0755)
}
func appendFile(filename string, data string) error {
fp, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0755)
if err != nil {
return err
}
defer fp.Close()
_, err = fp.WriteString(data)
if err != nil {
return err
}
return nil
}
func makeDescriptor(name, syscall string) string {
d := fmt.Sprintf("p:kprobes/%s %s", name, syscall)
// command line args will be in %si, we're asking ftrace for them
for argn := 0; argn < maxArguments; argn++ {
d += fmt.Sprintf(" arg%d=+0(+%d(%%si)):string", argn, argn*8)
}
return d
}
func mapSubevents(subEvents []string) map[string]string {
m := make(map[string]string)
if subEvents != nil {
for _, eventName := range subEvents {
eventPath := eventName
// includes a path, like 'sched/sched_process_fork'
if strings.ContainsRune(eventName, '/') == true {
parts := strings.SplitN(eventName, "/", 2)
eventName = parts[1]
}
m[eventName] = fmt.Sprintf(eventFileFormat, eventPath)
}
}
return m
}
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