def sigint_handler(sig, frame):
print("Killing sub-process...")
if process_handle is not None:
global kill_retry_count
while process_handle.returncode is None and kill_retry_count < kill_retry_max:
kill_retry_count += 1
print("Killing sub-process ({})...".format(kill_retry_count))
try:
os.killpg(os.getpgid(process_handle.pid), signal.SIGTERM)
os.waitpid(process_handle.pid, os.WNOHANG)
except ProcessLookupError:
break
try:
process_handle.wait(1)
except subprocess.TimeoutExpired:
pass
if working_dir is not None:
rmdir(working_dir)
sys.exit(0)
python类WNOHANG的实例源码
def reapProcess(self):
"""Try to reap a process (without blocking) via waitpid.
This is called when sigchild is caught or a Process object loses its
"connection" (stdout is closed) This ought to result in reaping all
zombie processes, since it will be called twice as often as it needs
to be.
(Unfortunately, this is a slightly experimental approach, since
UNIX has no way to be really sure that your process is going to
go away w/o blocking. I don't want to block.)
"""
try:
pid, status = os.waitpid(self.pid, os.WNOHANG)
except:
log.msg('Failed to reap %d:' % self.pid)
log.err()
pid = None
if pid:
self.processEnded(status)
unregisterReapProcessHandler(pid, self)
def _internal_poll(self, _deadstate=None, _waitpid=os.waitpid,
_WNOHANG=os.WNOHANG, _os_error=os.error, _ECHILD=errno.ECHILD):
"""Check if child process has terminated. Returns returncode
attribute.
This method is called by __del__, so it cannot reference anything
outside of the local scope (nor can any methods it calls).
"""
if self.returncode is None:
try:
pid, sts = _waitpid(self.pid, _WNOHANG)
if pid == self.pid:
self._handle_exitstatus(sts)
except _os_error as e:
if _deadstate is not None:
self.returncode = _deadstate
if e.errno == _ECHILD:
# This happens if SIGCLD is set to be ignored or
# waiting for child processes has otherwise been
# disabled for our process. This child is dead, we
# can't get the status.
# http://bugs.python.org/issue15756
self.returncode = 0
return self.returncode
def poll(self, flag=os.WNOHANG):
if self.returncode is None:
while True:
try:
pid, sts = os.waitpid(self.pid, flag)
except os.error as e:
if e.errno == errno.EINTR:
continue
# Child process not yet created. See #1731717
# e.errno == errno.ECHILD == 10
return None
else:
break
if pid == self.pid:
if os.WIFSIGNALED(sts):
self.returncode = -os.WTERMSIG(sts)
else:
assert os.WIFEXITED(sts)
self.returncode = os.WEXITSTATUS(sts)
return self.returncode
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def _internal_poll(self, _deadstate=None, _waitpid=os.waitpid,
_WNOHANG=os.WNOHANG, _os_error=os.error, _ECHILD=errno.ECHILD):
"""Check if child process has terminated. Returns returncode
attribute.
This method is called by __del__, so it cannot reference anything
outside of the local scope (nor can any methods it calls).
"""
if self.returncode is None:
try:
pid, sts = _waitpid(self.pid, _WNOHANG)
if pid == self.pid:
self._handle_exitstatus(sts)
except _os_error as e:
if _deadstate is not None:
self.returncode = _deadstate
elif e.errno == _ECHILD:
# This happens if SIGCLD is set to be ignored or
# waiting for child processes has otherwise been
# disabled for our process. This child is dead, we
# can't get the status.
# http://bugs.python.org/issue15756
self.returncode = 0
return self.returncode
def wait_impl(self, cpid):
option = os.WNOHANG
if sys.platform.startswith('aix'):
# Issue #11185: wait4 is broken on AIX and will always return 0
# with WNOHANG.
option = 0
for i in range(10):
# wait4() shouldn't hang, but some of the buildbots seem to hang
# in the forking tests. This is an attempt to fix the problem.
spid, status, rusage = os.wait4(cpid, option)
if spid == cpid:
break
time.sleep(1.0)
self.assertEqual(spid, cpid)
self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
self.assertTrue(rusage)
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def launch(self):
self.check()
received = False
def set_received(*_):
nonlocal received
received = True
signal.signal(signal.SIGUSR1, set_received)
pid = self.fork_zeo()
if not received:
while not signal.sigtimedwait([signal.SIGUSR1], 1):
pid, waitres = os.waitpid(pid, os.WNOHANG)
if pid:
log.error('Database server failed to start (check log above).')
sys.exit(1)
settings.DB_URI = urlunsplit(('zeo', '', self.zeo_path, '', ''))
log.debug('Launched built-in ZEO')
return pid
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def _internal_poll(self, _deadstate=None, _waitpid=os.waitpid,
_WNOHANG=os.WNOHANG, _os_error=os.error, _ECHILD=errno.ECHILD):
"""Check if child process has terminated. Returns returncode
attribute.
This method is called by __del__, so it cannot reference anything
outside of the local scope (nor can any methods it calls).
"""
if self.returncode is None:
try:
pid, sts = _waitpid(self.pid, _WNOHANG)
if pid == self.pid:
self._handle_exitstatus(sts)
except _os_error as e:
if _deadstate is not None:
self.returncode = _deadstate
if e.errno == _ECHILD:
# This happens if SIGCLD is set to be ignored or
# waiting for child processes has otherwise been
# disabled for our process. This child is dead, we
# can't get the status.
# http://bugs.python.org/issue15756
self.returncode = 0
return self.returncode
def wait(self):
"""Wait for child process to terminate. Returns returncode
attribute."""
while self.returncode is None:
try:
pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
except OSError as e:
if e.errno != errno.ECHILD:
raise
# This happens if SIGCLD is set to be ignored or waiting
# for child processes has otherwise been disabled for our
# process. This child is dead, we can't get the status.
pid = self.pid
sts = 0
# Check the pid and loop as waitpid has been known to return
# 0 even without WNOHANG in odd situations. issue14396.
if pid == self.pid:
self._handle_exitstatus(sts)
return self.returncode
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def abort(self, reason=''):
if self.id is None:
self.save()
if self.proc:
self.proc.terminate()
elif self.pid:
os.kill(self.pid, signal.SIGTERM)
pid, stat = os.waitpid(self.pid, os.WNOHANG)
if pid == 0:
os.kill(self.pid, signal.SIGKILL)
pid, stat = os.waitpid(self.pid, os.WNOHANG)
if pid == 0:
Log.error('Unable to kill job: %s (%i) with pid: %i' % (self.name, self.id, self.pid), reason)
self.status = 'Aborted'
self.remove_lock_file()
self.stop_date = datetime.utcnow()
self.running = False
Log.warning('Job aborted: %s (%i)' % (self.name, self.id), reason)
self.save()
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
def wait_impl(self, cpid):
option = os.WNOHANG
if sys.platform.startswith('aix'):
# Issue #11185: wait4 is broken on AIX and will always return 0
# with WNOHANG.
option = 0
for i in range(10):
# wait4() shouldn't hang, but some of the buildbots seem to hang
# in the forking tests. This is an attempt to fix the problem.
spid, status, rusage = os.wait4(cpid, option)
if spid == cpid:
break
time.sleep(1.0)
self.assertEqual(spid, cpid)
self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
self.assertTrue(rusage)
def poll(self, flag=os.WNOHANG):
if self.returncode is None:
while True:
try:
pid, sts = os.waitpid(self.pid, flag)
except OSError as e:
if e.errno == errno.EINTR:
continue
# Child process not yet created. See #1731717
# e.errno == errno.ECHILD == 10
return None
else:
break
if pid == self.pid:
if os.WIFSIGNALED(sts):
self.returncode = -os.WTERMSIG(sts)
else:
assert os.WIFEXITED(sts)
self.returncode = os.WEXITSTATUS(sts)
return self.returncode
def wait_impl(self, cpid):
option = os.WNOHANG
if sys.platform.startswith('aix'):
# Issue #11185: wait4 is broken on AIX and will always return 0
# with WNOHANG.
option = 0
for i in range(10):
# wait4() shouldn't hang, but some of the buildbots seem to hang
# in the forking tests. This is an attempt to fix the problem.
spid, status, rusage = os.wait4(cpid, option)
if spid == cpid:
break
time.sleep(1.0)
self.assertEqual(spid, cpid)
self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
self.assertTrue(rusage)
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
