def interrupt_kernel(self):
""" Interrupts the kernel. Unlike ``signal_kernel``, this operation is
well supported on all platforms.
"""
if self.has_kernel:
if sys.platform == 'win32':
from parentpoller import ParentPollerWindows as Poller
Poller.send_interrupt(self.kernel.win32_interrupt_event)
else:
self.kernel.send_signal(signal.SIGINT)
else:
raise RuntimeError("Cannot interrupt kernel. No kernel is running!")
def interrupt_kernel(self):
""" Interrupts the kernel. Unlike ``signal_kernel``, this operation is
well supported on all platforms.
"""
if self.has_kernel:
if sys.platform == 'win32':
from parentpoller import ParentPollerWindows as Poller
Poller.send_interrupt(self.kernel.win32_interrupt_event)
else:
self.kernel.send_signal(signal.SIGINT)
else:
raise RuntimeError("Cannot interrupt kernel. No kernel is running!")
def interrupt_kernel(self, kernel_id):
"""Interrupt (SIGINT) the kernel by its uuid.
Parameters
==========
kernel_id : uuid
The id of the kernel to interrupt.
"""
kernel_process = self.get_kernel_process(kernel_id)
if kernel_process is not None:
if sys.platform == 'win32':
from parentpoller import ParentPollerWindows as Poller
Poller.send_interrupt(kernel_process.win32_interrupt_event)
else:
kernel_process.send_signal(signal.SIGINT)
def init_poller(self):
if sys.platform == 'win32':
if self.interrupt or self.parent_handle:
self.poller = ParentPollerWindows(self.interrupt,
self.parent_handle)
elif self.parent_handle:
self.poller = ParentPollerUnix()
def start_kernel(namespace, kernel):
""" Starts a kernel.
"""
# Configure this kernel process to poll the parent process, if necessary.
if sys.platform == 'win32':
if namespace.interrupt or namespace.parent:
poller = ParentPollerWindows(namespace.interrupt, namespace.parent)
poller.start()
elif namespace.parent:
poller = ParentPollerUnix()
poller.start()
# Start the kernel mainloop.
kernel.start()
def start_kernel(namespace, kernel):
""" Starts a kernel.
"""
# Configure this kernel process to poll the parent process, if necessary.
if sys.platform == 'win32':
if namespace.interrupt or namespace.parent:
poller = ParentPollerWindows(namespace.interrupt, namespace.parent)
poller.start()
elif namespace.parent:
poller = ParentPollerUnix()
poller.start()
# Start the kernel mainloop.
kernel.start()
def base_launch_kernel(code, xrep_port=0, pub_port=0, req_port=0, hb_port=0,
independent=False, extra_arguments=[]):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
xrep_port : int, optional
The port to use for XREP channel.
pub_port : int, optional
The port to use for the SUB channel.
req_port : int, optional
The port to use for the REQ (raw input) channel.
hb_port : int, optional
The port to use for the hearbeat REP channel.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments = list, optional
A list of extra arguments to pass when executing the launch code.
Returns
-------
A tuple of form:
(kernel_process, xrep_port, pub_port, req_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Find open ports as necessary.
ports = []
ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + \
int(req_port <= 0) + int(hb_port <= 0)
for i in xrange(ports_needed):
sock = socket.socket()
sock.bind(('', 0))
ports.append(sock)
for i, sock in enumerate(ports):
port = sock.getsockname()[1]
sock.close()
ports[i] = port
if xrep_port <= 0:
xrep_port = ports.pop(0)
if pub_port <= 0:
pub_port = ports.pop(0)
if req_port <= 0:
req_port = ports.pop(0)
if hb_port <= 0:
hb_port = ports.pop(0)
# Build the kernel launch command.
arguments = [ sys.executable, '-c', code, '--xrep', str(xrep_port),
'--pub', str(pub_port), '--req', str(req_port),
'--hb', str(hb_port) ]
arguments.extend(extra_arguments)
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += [ '--interrupt', str(int(interrupt_event)) ]
# If using pythonw, stdin, stdout, and stderr are invalid. Popen will
# fail unless they are suitably redirected. We don't read from the
# pipes, but they must exist.
redirect = PIPE if sys.executable.endswith('pythonw.exe') else None
if independent:
proc = Popen(arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdout=redirect, stderr=redirect, stdin=redirect)
else:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(pid, pid, pid, 0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent', str(int(handle))],
stdout=redirect, stderr=redirect, stdin=redirect)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect is not None:
proc.stdout.close()
proc.stderr.close()
proc.stdin.close()
else:
if independent:
proc = Popen(arguments, preexec_fn=lambda: os.setsid())
else:
proc = Popen(arguments + ['--parent'])
return proc, xrep_port, pub_port, req_port, hb_port
def bin_launch_kernel(executable,
fname,
stdin=None,
stdout=None,
stderr=None,
independent=False,
extra_arguments=[],
cwd=None):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
fname : unicode, optional
The JSON connector file, containing ip/port/hmac key information.
key : str, optional
The Session key used for HMAC authentication.
executable : str, optional (default sys.executable)
The Python executable to use for the kernel process.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments : list, optional
A list of extra arguments to pass when executing the launch code.
cwd : path, optional
The working dir of the kernel process (default: cwd of this process).
Returns
-------
A tuple of form:
(kernel_process, shell_port, iopub_port, stdin_port, hb_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Build the kernel launch command.
arguments = [executable, '-f', fname]
arguments.extend(extra_arguments)
print("entry_point - launching kernel %s" % arguments)
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
redirect_out = False
_stdin = PIPE if stdin is None else stdin
_stdout, _stderr = stdout, stderr
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += ['--interrupt=%i' % interrupt_event]
# If the kernel is running on pythonw and stdout/stderr are not been
# re-directed, it will crash when more than 4KB of data is written to
# stdout or stderr. This is a bug that has been with Python for a very
# long time; see http://bugs.python.org/issue706263.
# A cleaner solution to this problem would be to pass os.devnull to
# Popen directly. Unfortunately, that does not work.
if executable.endswith('pythonw.exe'):
if stdout is None:
arguments.append('--no-stdout')
if stderr is None:
arguments.append('--no-stderr')
# Launch the kernel process.
if independent:
proc = Popen(
arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdin=_stdin,
stdout=_stdout,
stderr=_stderr)
else:
try:
from _winapi import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
except:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent=%i' % int(handle)],
stdin=_stdin,
stdout=_stdout,
stderr=_stderr)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
else:
if independent:
proc = Popen(arguments,
preexec_fn=lambda: os.setsid(),
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd)
else:
proc = Popen(arguments + ['--parent=1'],
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd)
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
if redirect_out:
if stdout is None:
proc.stdout.close()
if stderr is None:
proc.stderr.close()
return proc
def base_launch_kernel(code, fname, stdin=None, stdout=None, stderr=None,
executable=None, independent=False, extra_arguments=[]):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
fname : unicode, optional
The JSON connector file, containing ip/port/hmac key information.
key : str, optional
The Session key used for HMAC authentication.
executable : str, optional (default sys.executable)
The Python executable to use for the kernel process.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments = list, optional
A list of extra arguments to pass when executing the launch code.
Returns
-------
A tuple of form:
(kernel_process, shell_port, iopub_port, stdin_port, hb_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Build the kernel launch command.
if executable is None:
executable = sys.executable
arguments = [ executable, '-c', code, '-f', fname ]
arguments.extend(extra_arguments)
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
_stdin = PIPE if stdin is None else stdin
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith('pythonw.exe')
if redirect_out:
_stdout = PIPE if stdout is None else stdout
_stderr = PIPE if stderr is None else stderr
else:
_stdout, _stderr = stdout, stderr
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += [ '--interrupt=%i'%interrupt_event ]
# If the kernel is running on pythonw and stdout/stderr are not been
# re-directed, it will crash when more than 4KB of data is written to
# stdout or stderr. This is a bug that has been with Python for a very
# long time; see http://bugs.python.org/issue706263.
# A cleaner solution to this problem would be to pass os.devnull to
# Popen directly. Unfortunately, that does not work.
if executable.endswith('pythonw.exe'):
if stdout is None:
arguments.append('--no-stdout')
if stderr is None:
arguments.append('--no-stderr')
# Launch the kernel process.
if independent:
proc = Popen(arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdin=_stdin, stdout=_stdout, stderr=_stderr)
else:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(pid, pid, pid, 0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent=%i'%int(handle)],
stdin=_stdin, stdout=_stdout, stderr=_stderr)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
else:
if independent:
proc = Popen(arguments, preexec_fn=lambda: os.setsid(),
stdin=_stdin, stdout=_stdout, stderr=_stderr)
else:
proc = Popen(arguments + ['--parent=1'],
stdin=_stdin, stdout=_stdout, stderr=_stderr)
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
if redirect_out:
if stdout is None:
proc.stdout.close()
if stderr is None:
proc.stderr.close()
return proc
def base_launch_kernel(code,
shell_port=0,
iopub_port=0,
stdin_port=0,
hb_port=0,
ip=None,
stdin=None,
stdout=None,
stderr=None,
executable=None,
independent=False,
extra_arguments=[]):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
shell_port : int, optional
The port to use for XREP channel.
iopub_port : int, optional
The port to use for the SUB channel.
stdin_port : int, optional
The port to use for the REQ (raw input) channel.
hb_port : int, optional
The port to use for the hearbeat REP channel.
ip : str, optional
The ip address the kernel will bind to.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
executable : str, optional (default sys.executable)
The Python executable to use for the kernel process.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments = list, optional
A list of extra arguments to pass when executing the launch code.
Returns
-------
A tuple of form:
(kernel_process, shell_port, iopub_port, stdin_port, hb_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Find open ports as necessary.
ports = []
ports_needed = int(shell_port <= 0) + int(iopub_port <= 0) + \
int(stdin_port <= 0) + int(hb_port <= 0)
for i in xrange(ports_needed):
sock = socket.socket()
sock.bind(('', 0))
ports.append(sock)
for i, sock in enumerate(ports):
port = sock.getsockname()[1]
sock.close()
ports[i] = port
if shell_port <= 0:
shell_port = ports.pop(0)
if iopub_port <= 0:
iopub_port = ports.pop(0)
if stdin_port <= 0:
stdin_port = ports.pop(0)
if hb_port <= 0:
hb_port = ports.pop(0)
# Build the kernel launch command.
if executable is None:
executable = sys.executable
arguments = [
executable, '-c', code,
'--shell=%i' % shell_port,
'--iopub=%i' % iopub_port,
'--stdin=%i' % stdin_port,
'--hb=%i' % hb_port
]
if ip is not None:
arguments.append('--ip=%s' % ip)
arguments.extend(extra_arguments)
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += ['--interrupt=%i' % interrupt_event]
# If this process in running on pythonw, stdin, stdout, and stderr are
# invalid. Popen will fail unless they are suitably redirected. We don't
# read from the pipes, but they must exist.
if sys.executable.endswith('pythonw.exe'):
redirect = True
_stdin = PIPE if stdin is None else stdin
_stdout = PIPE if stdout is None else stdout
_stderr = PIPE if stderr is None else stderr
else:
redirect = False
_stdin, _stdout, _stderr = stdin, stdout, stderr
# If the kernel is running on pythonw and stdout/stderr are not been
# re-directed, it will crash when more than 4KB of data is written to
# stdout or stderr. This is a bug that has been with Python for a very
# long time; see http://bugs.python.org/issue706263.
# A cleaner solution to this problem would be to pass os.devnull to
# Popen directly. Unfortunately, that does not work.
if executable.endswith('pythonw.exe'):
if stdout is None:
arguments.append('--no-stdout')
if stderr is None:
arguments.append('--no-stderr')
# Launch the kernel process.
if independent:
proc = Popen(
arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdin=_stdin,
stdout=_stdout,
stderr=_stderr)
else:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent=%i' % int(handle)],
stdin=_stdin,
stdout=_stdout,
stderr=_stderr)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect:
if stdin is None:
proc.stdin.close()
if stdout is None:
proc.stdout.close()
if stderr is None:
proc.stderr.close()
else:
if independent:
proc = Popen(arguments,
preexec_fn=lambda: os.setsid(),
stdin=stdin,
stdout=stdout,
stderr=stderr)
else:
proc = Popen(arguments + ['--parent=1'],
stdin=stdin,
stdout=stdout,
stderr=stderr)
return proc, shell_port, iopub_port, stdin_port, hb_port
def base_launch_kernel(code,
xrep_port=0,
pub_port=0,
req_port=0,
hb_port=0,
independent=False,
extra_arguments=[]):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
xrep_port : int, optional
The port to use for XREP channel.
pub_port : int, optional
The port to use for the SUB channel.
req_port : int, optional
The port to use for the REQ (raw input) channel.
hb_port : int, optional
The port to use for the hearbeat REP channel.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments = list, optional
A list of extra arguments to pass when executing the launch code.
Returns
-------
A tuple of form:
(kernel_process, xrep_port, pub_port, req_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Find open ports as necessary.
ports = []
ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + \
int(req_port <= 0) + int(hb_port <= 0)
for i in xrange(ports_needed):
sock = socket.socket()
sock.bind(('', 0))
ports.append(sock)
for i, sock in enumerate(ports):
port = sock.getsockname()[1]
sock.close()
ports[i] = port
if xrep_port <= 0:
xrep_port = ports.pop(0)
if pub_port <= 0:
pub_port = ports.pop(0)
if req_port <= 0:
req_port = ports.pop(0)
if hb_port <= 0:
hb_port = ports.pop(0)
# Build the kernel launch command.
arguments = [
sys.executable, '-c', code, '--xrep',
str(xrep_port), '--pub',
str(pub_port), '--req',
str(req_port), '--hb',
str(hb_port)
]
arguments.extend(extra_arguments)
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += ['--interrupt', str(int(interrupt_event))]
# If using pythonw, stdin, stdout, and stderr are invalid. Popen will
# fail unless they are suitably redirected. We don't read from the
# pipes, but they must exist.
redirect = PIPE if sys.executable.endswith('pythonw.exe') else None
if independent:
proc = Popen(
arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdout=redirect,
stderr=redirect,
stdin=redirect)
else:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent', str(int(handle))],
stdout=redirect,
stderr=redirect,
stdin=redirect)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect is not None:
proc.stdout.close()
proc.stderr.close()
proc.stdin.close()
else:
if independent:
proc = Popen(arguments, preexec_fn=lambda: os.setsid())
else:
proc = Popen(arguments + ['--parent'])
return proc, xrep_port, pub_port, req_port, hb_port
def base_launch_kernel(code, xrep_port=0, pub_port=0, req_port=0, hb_port=0,
stdin=None, stdout=None, stderr=None,
executable=None, independent=False, extra_arguments=[]):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
code : str,
A string of Python code that imports and executes a kernel entry point.
xrep_port : int, optional
The port to use for XREP channel.
pub_port : int, optional
The port to use for the SUB channel.
req_port : int, optional
The port to use for the REQ (raw input) channel.
hb_port : int, optional
The port to use for the hearbeat REP channel.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
executable : str, optional (default sys.executable)
The Python executable to use for the kernel process.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
extra_arguments = list, optional
A list of extra arguments to pass when executing the launch code.
Returns
-------
A tuple of form:
(kernel_process, xrep_port, pub_port, req_port)
where kernel_process is a Popen object and the ports are integers.
"""
# Find open ports as necessary.
ports = []
ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + \
int(req_port <= 0) + int(hb_port <= 0)
for i in xrange(ports_needed):
sock = socket.socket()
sock.bind(('', 0))
ports.append(sock)
for i, sock in enumerate(ports):
port = sock.getsockname()[1]
sock.close()
ports[i] = port
if xrep_port <= 0:
xrep_port = ports.pop(0)
if pub_port <= 0:
pub_port = ports.pop(0)
if req_port <= 0:
req_port = ports.pop(0)
if hb_port <= 0:
hb_port = ports.pop(0)
# Build the kernel launch command.
if executable is None:
executable = sys.executable
arguments = [ executable, '-c', code, '--xrep', str(xrep_port),
'--pub', str(pub_port), '--req', str(req_port),
'--hb', str(hb_port) ]
arguments.extend(extra_arguments)
# Spawn a kernel.
if sys.platform == 'win32':
# Create a Win32 event for interrupting the kernel.
interrupt_event = ParentPollerWindows.create_interrupt_event()
arguments += [ '--interrupt', str(int(interrupt_event)) ]
# If this process in running on pythonw, stdin, stdout, and stderr are
# invalid. Popen will fail unless they are suitably redirected. We don't
# read from the pipes, but they must exist.
if sys.executable.endswith('pythonw.exe'):
redirect = True
_stdin = PIPE if stdin is None else stdin
_stdout = PIPE if stdout is None else stdout
_stderr = PIPE if stderr is None else stderr
else:
redirect = False
_stdin, _stdout, _stderr = stdin, stdout, stderr
# If the kernel is running on pythonw and stdout/stderr are not been
# re-directed, it will crash when more than 4KB of data is written to
# stdout or stderr. This is a bug that has been with Python for a very
# long time; see http://bugs.python.org/issue706263.
# A cleaner solution to this problem would be to pass os.devnull to
# Popen directly. Unfortunately, that does not work.
if executable.endswith('pythonw.exe'):
if stdout is None:
arguments.append('--no-stdout')
if stderr is None:
arguments.append('--no-stderr')
# Launch the kernel process.
if independent:
proc = Popen(arguments,
creationflags=512, # CREATE_NEW_PROCESS_GROUP
stdin=_stdin, stdout=_stdout, stderr=_stderr)
else:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS
pid = GetCurrentProcess()
handle = DuplicateHandle(pid, pid, pid, 0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
proc = Popen(arguments + ['--parent', str(int(handle))],
stdin=_stdin, stdout=_stdout, stderr=_stderr)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect:
if stdin is None:
proc.stdin.close()
if stdout is None:
proc.stdout.close()
if stderr is None:
proc.stderr.close()
else:
if independent:
proc = Popen(arguments, preexec_fn=lambda: os.setsid(),
stdin=stdin, stdout=stdout, stderr=stderr)
else:
proc = Popen(arguments + ['--parent'],
stdin=stdin, stdout=stdout, stderr=stderr)
return proc, xrep_port, pub_port, req_port, hb_port