blob: 5889f556f61cf8469268b9e0596657bb200ce04c (
plain)
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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
from portage import os
from _emerge.AbstractPollTask import AbstractPollTask
import signal
import errno
class SubProcess(AbstractPollTask):
__slots__ = ("pid",) + \
("_files", "_reg_id")
# A file descriptor is required for the scheduler to monitor changes from
# inside a poll() loop. When logging is not enabled, create a pipe just to
# serve this purpose alone.
_dummy_pipe_fd = 9
def _poll(self):
if self.returncode is not None:
return self.returncode
if self.pid is None:
return self.returncode
if self._registered:
return self.returncode
try:
retval = os.waitpid(self.pid, os.WNOHANG)
except OSError as e:
if e.errno != errno.ECHILD:
raise
del e
retval = (self.pid, 1)
if retval == (0, 0):
return None
self._set_returncode(retval)
return self.returncode
def cancel(self):
if self.isAlive():
try:
os.kill(self.pid, signal.SIGTERM)
except OSError as e:
if e.errno != errno.ESRCH:
raise
del e
self.cancelled = True
if self.pid is not None:
self.wait()
return self.returncode
def isAlive(self):
return self.pid is not None and \
self.returncode is None
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 not None:
return self.returncode
try:
wait_retval = os.waitpid(self.pid, 0)
except OSError as e:
if e.errno != errno.ECHILD:
raise
del e
self._set_returncode((self.pid, 1))
else:
self._set_returncode(wait_retval)
return self.returncode
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
def _set_returncode(self, wait_retval):
retval = wait_retval[1]
if retval != os.EX_OK:
if retval & 0xff:
retval = (retval & 0xff) << 8
else:
retval = retval >> 8
self.returncode = retval
|
GitWeb