func (j *Journal) getData(field string) (unsafe.Pointer, C.int, error) {
sd_journal_get_data, err := getFunction("sd_journal_get_data")
if err != nil {
return nil, 0, err
}
f := C.CString(field)
defer C.free(unsafe.Pointer(f))
var d unsafe.Pointer
var l C.size_t
j.mu.Lock()
r := C.my_sd_journal_get_data(sd_journal_get_data, j.cjournal, f, &d, &l)
j.mu.Unlock()
if r < 0 {
return nil, 0, fmt.Errorf("failed to read message: %d", syscall.Errno(-r))
}
return d, C.int(l), nil
}
// GetData gets the data object associated with a specific field from the
// current journal entry.
func (j *Journal) GetData(field string) (string, error) {
sd_journal_get_data, err := j.getFunction("sd_journal_get_data")
if err != nil {
return "", err
}
f := C.CString(field)
defer C.free(unsafe.Pointer(f))
var d unsafe.Pointer
var l C.size_t
j.mu.Lock()
r := C.my_sd_journal_get_data(sd_journal_get_data, j.cjournal, f, &d, &l)
j.mu.Unlock()
if r < 0 {
return "", fmt.Errorf("failed to read message: %d", syscall.Errno(-r))
}
msg := C.GoStringN((*C.char)(d), C.int(l))
return msg, nil
}