// Poll reports whether there is input available in the stream.
func (s *Stream) Poll() (bool, error) {
poll := C.Pm_Poll(unsafe.Pointer(s.pmStream))
if poll < 0 {
return false, convertToError(C.PmError(poll))
}
return poll > 0, nil
}
func (s SystemPort) poll() (bool, error) {
if s.IsInputPort == true {
return false, errors.New("Can't poll from an input port, " +
"only output ports.")
}
if s.stream == nil {
return false, errors.New("No input stream set on this SystemPort.")
}
if s.IsOpen() == false {
return false, errors.New("SystemPort is not open.")
}
dataAvailable, err := C.Pm_Poll(s.stream)
if err != nil {
return false, err // Tried to read data, failed.
}
if dataAvailable > 0 {
return true, nil // Data available.
}
return false, nil // No data available.
}