[pygtk] Non-blocking subprocess.Popen stop GUI

[Bou Baris]

> Instead of using select() use gobject.io_add_watch() on proc.stdout to
> register a callback function that is used to read the % and set the progress
> bar.

I've modified my code to test gobject.io_add_watch()
I expect that test_io_watch() print in console line readed from proc.stdout
But i see nothing: look like a blocking behaviour (as when use Popen
without use select)
If I stop program with CTRL-C, now I see the output to console/terminal


  def test_io_watch(self, file, condition):
        print str(file.readline())
        return True

  def mkv_dts_extraction(self,dtstrack,pgbar=None):

        command=['mkvextract', \
                    'tracks', \
                    self.INPUTFILE, \
                    dtstrack + ':' + self.TEMP_DTSFILENAME]

        proc=subprocess.Popen(command,stdout=subprocess.PIPE)

        outfile=proc.stdout
        outfd=outfile.fileno()
        file_flags = fcntl.fcntl(outfd, fcntl.F_GETFL)
        fcntl.fcntl(outfd, fcntl.F_SETFL, file_flags | os.O_NDELAY)

        gobject.io_add_watch(proc.stdout,gobject.IO_IN |
gobject.IO_HUP,self.test_io_watch)

        err = proc.wait()

        return True