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# Copyright 2010-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
from _emerge.AbstractPollTask import AbstractPollTask
from portage import os
from portage.cache.mappings import slot_dict_class
class FifoIpcDaemon(AbstractPollTask):
__slots__ = ("input_fifo", "output_fifo", "_files")
_file_names = ("pipe_in",)
_files_dict = slot_dict_class(_file_names, prefix="")
def _start(self):
self._files = self._files_dict()
# File streams are in unbuffered mode since we do atomic
# read and write of whole pickles.
self._files.pipe_in = os.open(self.input_fifo, os.O_RDONLY | os.O_NONBLOCK)
self.scheduler.add_reader(self._files.pipe_in, self._input_handler)
self._registered = True
def _reopen_input(self):
"""
Re-open the input stream, in order to suppress
POLLHUP events (bug #339976).
"""
self.scheduler.remove_reader(self._files.pipe_in)
os.close(self._files.pipe_in)
self._files.pipe_in = os.open(self.input_fifo, os.O_RDONLY | os.O_NONBLOCK)
self.scheduler.add_reader(self._files.pipe_in, self._input_handler)
def _cancel(self):
if self.returncode is None:
self.returncode = 1
self._unregister()
# notify exit listeners
self._async_wait()
def _input_handler(self):
raise NotImplementedError(self)
def _unregister(self):
"""
Unregister from the scheduler and close open files.
"""
self._registered = False
if self._files is not None:
for f in self._files.values():
self.scheduler.remove_reader(f)
os.close(f)
self._files = None
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