Dummy writer prevents a fifo from sending EOFs to all readers when the real writer exits.

open_dummy_pipe.py

while True:
  self.logger.info("[Re]starting to read %s" % self.input_file)
  with open(self.input_file, "rb") as f:
    f1 = open (fname, "w") # The dummy writer has to be opened after a reader, otherwise it would block
    for line in f:
    ...do_stuff_with_line...(line)