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# Copyright 2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from portage import os
from _emerge.AbstractPollTask import AbstractPollTask
from portage.cache.mappings import slot_dict_class
class FifoIpcDaemon(AbstractPollTask):
__slots__ = ("input_fifo", "output_fifo",) + \
("_files", "_reg_id",)
_file_names = ("pipe_in",)
_files_dict = slot_dict_class(_file_names, prefix="")
def _start(self):
self._files = self._files_dict()
input_fd = os.open(self.input_fifo, os.O_RDONLY|os.O_NONBLOCK)
# File streams are in unbuffered mode since we do atomic
# read and write of whole pickles.
self._files.pipe_in = os.fdopen(input_fd, 'rb', 0)
self._reg_id = self.scheduler.register(
self._files.pipe_in.fileno(),
self._registered_events, self._input_handler)
self._registered = True
def _reopen_input(self):
"""
Re-open the input stream, in order to suppress
POLLHUP events (bug #339976).
"""
self._files.pipe_in.close()
input_fd = os.open(self.input_fifo, os.O_RDONLY|os.O_NONBLOCK)
self._files.pipe_in = os.fdopen(input_fd, 'rb', 0)
self.scheduler.unregister(self._reg_id)
self._reg_id = self.scheduler.register(
self._files.pipe_in.fileno(),
self._registered_events, self._input_handler)
def isAlive(self):
return self._registered
def cancel(self):
if self.returncode is None:
self.returncode = 1
self.cancelled = True
self._unregister()
self.wait()
def _wait(self):
if self.returncode is not None:
return self.returncode
if self._registered:
self.scheduler.schedule(self._reg_id)
self._unregister()
if self.returncode is None:
self.returncode = os.EX_OK
return self.returncode
def _input_handler(self, fd, event):
raise NotImplementedError(self)
def _unregister(self):
"""
Unregister from the scheduler and close open files.
"""
self._registered = False
if self._reg_id is not None:
self.scheduler.unregister(self._reg_id)
self._reg_id = None
if self._files is not None:
for f in self._files.values():
f.close()
self._files = None
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