1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
# Copyright 2010-2011 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._unregister()
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
|
GitWeb