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subprocess.py
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subprocess.py
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# subprocess - Subprocesses with accessible I/O streams
#
# For more information about this module, see PEP 324.
#
# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
#
# Licensed to PSF under a Contributor Agreement.
# See http://www.python.org/2.4/license for licensing details.
r"""Subprocesses with accessible I/O streams
This module allows you to spawn processes, connect to their
input/output/error pipes, and obtain their return codes.
For a complete description of this module see the Python documentation.
Main API
========
run(...): Runs a command, waits for it to complete, then returns a
CompletedProcess instance.
Popen(...): A class for flexibly executing a command in a new process
Constants
---------
DEVNULL: Special value that indicates that os.devnull should be used
PIPE: Special value that indicates a pipe should be created
STDOUT: Special value that indicates that stderr should go to stdout
Older API
=========
call(...): Runs a command, waits for it to complete, then returns
the return code.
check_call(...): Same as call() but raises CalledProcessError()
if return code is not 0
check_output(...): Same as check_call() but returns the contents of
stdout instead of a return code
getoutput(...): Runs a command in the shell, waits for it to complete,
then returns the output
getstatusoutput(...): Runs a command in the shell, waits for it to complete,
then returns a (exitcode, output) tuple
"""
import sys
_mswindows = (sys.platform == "win32")
import io
import os
import time
import signal
import builtins
import warnings
import errno
from time import monotonic as _time
# Exception classes used by this module.
class SubprocessError(Exception): pass
class CalledProcessError(SubprocessError):
"""Raised when run() is called with check=True and the process
returns a non-zero exit status.
Attributes:
cmd, returncode, stdout, stderr, output
"""
def __init__(self, returncode, cmd, output=None, stderr=None):
self.returncode = returncode
self.cmd = cmd
self.output = output
self.stderr = stderr
def __str__(self):
if self.returncode and self.returncode < 0:
try:
return "Command '%s' died with %r." % (
self.cmd, signal.Signals(-self.returncode))
except ValueError:
return "Command '%s' died with unknown signal %d." % (
self.cmd, -self.returncode)
else:
return "Command '%s' returned non-zero exit status %d." % (
self.cmd, self.returncode)
@property
def stdout(self):
"""Alias for output attribute, to match stderr"""
return self.output
@stdout.setter
def stdout(self, value):
# There's no obvious reason to set this, but allow it anyway so
# .stdout is a transparent alias for .output
self.output = value
class TimeoutExpired(SubprocessError):
"""This exception is raised when the timeout expires while waiting for a
child process.
Attributes:
cmd, output, stdout, stderr, timeout
"""
def __init__(self, cmd, timeout, output=None, stderr=None):
self.cmd = cmd
self.timeout = timeout
self.output = output
self.stderr = stderr
def __str__(self):
return ("Command '%s' timed out after %s seconds" %
(self.cmd, self.timeout))
@property
def stdout(self):
return self.output
@stdout.setter
def stdout(self, value):
# There's no obvious reason to set this, but allow it anyway so
# .stdout is a transparent alias for .output
self.output = value
if _mswindows:
import threading
import msvcrt
import _winapi
class STARTUPINFO:
dwFlags = 0
hStdInput = None
hStdOutput = None
hStdError = None
wShowWindow = 0
else:
import _posixsubprocess
import select
import selectors
try:
import threading
except ImportError:
import dummy_threading as threading
# When select or poll has indicated that the file is writable,
# we can write up to _PIPE_BUF bytes without risk of blocking.
# POSIX defines PIPE_BUF as >= 512.
_PIPE_BUF = getattr(select, 'PIPE_BUF', 512)
# poll/select have the advantage of not requiring any extra file
# descriptor, contrarily to epoll/kqueue (also, they require a single
# syscall).
if hasattr(selectors, 'PollSelector'):
_PopenSelector = selectors.PollSelector
else:
_PopenSelector = selectors.SelectSelector
__all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", "getstatusoutput",
"getoutput", "check_output", "run", "CalledProcessError", "DEVNULL",
"SubprocessError", "TimeoutExpired", "CompletedProcess"]
# NOTE: We intentionally exclude list2cmdline as it is
# considered an internal implementation detail. issue10838.
if _mswindows:
from _winapi import (CREATE_NEW_CONSOLE, CREATE_NEW_PROCESS_GROUP,
STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
STD_ERROR_HANDLE, SW_HIDE,
STARTF_USESTDHANDLES, STARTF_USESHOWWINDOW)
__all__.extend(["CREATE_NEW_CONSOLE", "CREATE_NEW_PROCESS_GROUP",
"STD_INPUT_HANDLE", "STD_OUTPUT_HANDLE",
"STD_ERROR_HANDLE", "SW_HIDE",
"STARTF_USESTDHANDLES", "STARTF_USESHOWWINDOW",
"STARTUPINFO"])
class Handle(int):
closed = False
def Close(self, CloseHandle=_winapi.CloseHandle):
if not self.closed:
self.closed = True
CloseHandle(self)
def Detach(self):
if not self.closed:
self.closed = True
return int(self)
raise ValueError("already closed")
def __repr__(self):
return "%s(%d)" % (self.__class__.__name__, int(self))
__del__ = Close
__str__ = __repr__
# This lists holds Popen instances for which the underlying process had not
# exited at the time its __del__ method got called: those processes are wait()ed
# for synchronously from _cleanup() when a new Popen object is created, to avoid
# zombie processes.
_active = []
def _cleanup():
for inst in _active[:]:
res = inst._internal_poll(_deadstate=sys.maxsize)
if res is not None:
try:
_active.remove(inst)
except ValueError:
# This can happen if two threads create a new Popen instance.
# It's harmless that it was already removed, so ignore.
pass
PIPE = -1
STDOUT = -2
DEVNULL = -3
# XXX This function is only used by multiprocessing and the test suite,
# but it's here so that it can be imported when Python is compiled without
# threads.
def _optim_args_from_interpreter_flags():
"""Return a list of command-line arguments reproducing the current
optimization settings in sys.flags."""
args = []
value = sys.flags.optimize
if value > 0:
args.append('-' + 'O' * value)
return args
def _args_from_interpreter_flags():
"""Return a list of command-line arguments reproducing the current
settings in sys.flags, sys.warnoptions and sys._xoptions."""
flag_opt_map = {
'debug': 'd',
# 'inspect': 'i',
# 'interactive': 'i',
'dont_write_bytecode': 'B',
'no_site': 'S',
'verbose': 'v',
'bytes_warning': 'b',
'quiet': 'q',
# -O is handled in _optim_args_from_interpreter_flags()
}
args = _optim_args_from_interpreter_flags()
for flag, opt in flag_opt_map.items():
v = getattr(sys.flags, flag)
if v > 0:
args.append('-' + opt * v)
if sys.flags.isolated:
args.append('-I')
else:
if sys.flags.ignore_environment:
args.append('-E')
if sys.flags.no_user_site:
args.append('-s')
for opt in sys.warnoptions:
args.append('-W' + opt)
# -X options
xoptions = getattr(sys, '_xoptions', {})
for opt in ('faulthandler', 'tracemalloc',
'showalloccount', 'showrefcount', 'utf8'):
if opt in xoptions:
value = xoptions[opt]
if value is True:
arg = opt
else:
arg = '%s=%s' % (opt, value)
args.extend(('-X', arg))
return args
def call(*popenargs, timeout=None, **kwargs):
"""Run command with arguments. Wait for command to complete or
timeout, then return the returncode attribute.
The arguments are the same as for the Popen constructor. Example:
retcode = call(["ls", "-l"])
"""
with Popen(*popenargs, **kwargs) as p:
try:
return p.wait(timeout=timeout)
except:
p.kill()
p.wait()
raise
def check_call(*popenargs, **kwargs):
"""Run command with arguments. Wait for command to complete. If
the exit code was zero then return, otherwise raise
CalledProcessError. The CalledProcessError object will have the
return code in the returncode attribute.
The arguments are the same as for the call function. Example:
check_call(["ls", "-l"])
"""
retcode = call(*popenargs, **kwargs)
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
raise CalledProcessError(retcode, cmd)
return 0
def check_output(*popenargs, timeout=None, **kwargs):
r"""Run command with arguments and return its output.
If the exit code was non-zero it raises a CalledProcessError. The
CalledProcessError object will have the return code in the returncode
attribute and output in the output attribute.
The arguments are the same as for the Popen constructor. Example:
>>> check_output(["ls", "-l", "/dev/null"])
b'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
The stdout argument is not allowed as it is used internally.
To capture standard error in the result, use stderr=STDOUT.
>>> check_output(["/bin/sh", "-c",
... "ls -l non_existent_file ; exit 0"],
... stderr=STDOUT)
b'ls: non_existent_file: No such file or directory\n'
There is an additional optional argument, "input", allowing you to
pass a string to the subprocess's stdin. If you use this argument
you may not also use the Popen constructor's "stdin" argument, as
it too will be used internally. Example:
>>> check_output(["sed", "-e", "s/foo/bar/"],
... input=b"when in the course of fooman events\n")
b'when in the course of barman events\n'
If universal_newlines=True is passed, the "input" argument must be a
string and the return value will be a string rather than bytes.
"""
if 'stdout' in kwargs:
raise ValueError('stdout argument not allowed, it will be overridden.')
if 'input' in kwargs and kwargs['input'] is None:
# Explicitly passing input=None was previously equivalent to passing an
# empty string. That is maintained here for backwards compatibility.
kwargs['input'] = '' if kwargs.get('universal_newlines', False) else b''
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
**kwargs).stdout
class CompletedProcess(object):
"""A process that has finished running.
This is returned by run().
Attributes:
args: The list or str args passed to run().
returncode: The exit code of the process, negative for signals.
stdout: The standard output (None if not captured).
stderr: The standard error (None if not captured).
"""
def __init__(self, args, returncode, stdout=None, stderr=None):
self.args = args
self.returncode = returncode
self.stdout = stdout
self.stderr = stderr
def __repr__(self):
args = ['args={!r}'.format(self.args),
'returncode={!r}'.format(self.returncode)]
if self.stdout is not None:
args.append('stdout={!r}'.format(self.stdout))
if self.stderr is not None:
args.append('stderr={!r}'.format(self.stderr))
return "{}({})".format(type(self).__name__, ', '.join(args))
def check_returncode(self):
"""Raise CalledProcessError if the exit code is non-zero."""
if self.returncode:
raise CalledProcessError(self.returncode, self.args, self.stdout,
self.stderr)
def run(*popenargs, input=None, timeout=None, check=False, **kwargs):
"""Run command with arguments and return a CompletedProcess instance.
The returned instance will have attributes args, returncode, stdout and
stderr. By default, stdout and stderr are not captured, and those attributes
will be None. Pass stdout=PIPE and/or stderr=PIPE in order to capture them.
If check is True and the exit code was non-zero, it raises a
CalledProcessError. The CalledProcessError object will have the return code
in the returncode attribute, and output & stderr attributes if those streams
were captured.
If timeout is given, and the process takes too long, a TimeoutExpired
exception will be raised.
There is an optional argument "input", allowing you to
pass a string to the subprocess's stdin. If you use this argument
you may not also use the Popen constructor's "stdin" argument, as
it will be used internally.
The other arguments are the same as for the Popen constructor.
If universal_newlines=True is passed, the "input" argument must be a
string and stdout/stderr in the returned object will be strings rather than
bytes.
"""
if input is not None:
if 'stdin' in kwargs:
raise ValueError('stdin and input arguments may not both be used.')
kwargs['stdin'] = PIPE
with Popen(*popenargs, **kwargs) as process:
try:
stdout, stderr = process.communicate(input, timeout=timeout)
except TimeoutExpired:
process.kill()
stdout, stderr = process.communicate()
raise TimeoutExpired(process.args, timeout, output=stdout,
stderr=stderr)
except:
process.kill()
process.wait()
raise
retcode = process.poll()
if check and retcode:
raise CalledProcessError(retcode, process.args,
output=stdout, stderr=stderr)
return CompletedProcess(process.args, retcode, stdout, stderr)
def list2cmdline(seq):
"""
Translate a sequence of arguments into a command line
string, using the same rules as the MS C runtime:
1) Arguments are delimited by white space, which is either a
space or a tab.
2) A string surrounded by double quotation marks is
interpreted as a single argument, regardless of white space
contained within. A quoted string can be embedded in an
argument.
3) A double quotation mark preceded by a backslash is
interpreted as a literal double quotation mark.
4) Backslashes are interpreted literally, unless they
immediately precede a double quotation mark.
5) If backslashes immediately precede a double quotation mark,
every pair of backslashes is interpreted as a literal
backslash. If the number of backslashes is odd, the last
backslash escapes the next double quotation mark as
described in rule 3.
"""
# See
# http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
# or search http://msdn.microsoft.com for
# "Parsing C++ Command-Line Arguments"
result = []
needquote = False
for arg in seq:
bs_buf = []
# Add a space to separate this argument from the others
if result:
result.append(' ')
needquote = (" " in arg) or ("\t" in arg) or not arg
if needquote:
result.append('"')
for c in arg:
if c == '\\':
# Don't know if we need to double yet.
bs_buf.append(c)
elif c == '"':
# Double backslashes.
result.append('\\' * len(bs_buf)*2)
bs_buf = []
result.append('\\"')
else:
# Normal char
if bs_buf:
result.extend(bs_buf)
bs_buf = []
result.append(c)
# Add remaining backslashes, if any.
if bs_buf:
result.extend(bs_buf)
if needquote:
result.extend(bs_buf)
result.append('"')
return ''.join(result)
# Various tools for executing commands and looking at their output and status.
#
def getstatusoutput(cmd):
"""Return (exitcode, output) of executing cmd in a shell.
Execute the string 'cmd' in a shell with 'check_output' and
return a 2-tuple (status, output). The locale encoding is used
to decode the output and process newlines.
A trailing newline is stripped from the output.
The exit status for the command can be interpreted
according to the rules for the function 'wait'. Example:
>>> import subprocess
>>> subprocess.getstatusoutput('ls /bin/ls')
(0, '/bin/ls')
>>> subprocess.getstatusoutput('cat /bin/junk')
(1, 'cat: /bin/junk: No such file or directory')
>>> subprocess.getstatusoutput('/bin/junk')
(127, 'sh: /bin/junk: not found')
>>> subprocess.getstatusoutput('/bin/kill $$')
(-15, '')
"""
try:
data = check_output(cmd, shell=True, universal_newlines=True, stderr=STDOUT)
exitcode = 0
except CalledProcessError as ex:
data = ex.output
exitcode = ex.returncode
if data[-1:] == '\n':
data = data[:-1]
return exitcode, data
def getoutput(cmd):
"""Return output (stdout or stderr) of executing cmd in a shell.
Like getstatusoutput(), except the exit status is ignored and the return
value is a string containing the command's output. Example:
>>> import subprocess
>>> subprocess.getoutput('ls /bin/ls')
'/bin/ls'
"""
return getstatusoutput(cmd)[1]
_PLATFORM_DEFAULT_CLOSE_FDS = object()
class Popen(object):
""" Execute a child program in a new process.
For a complete description of the arguments see the Python documentation.
Arguments:
args: A string, or a sequence of program arguments.
bufsize: supplied as the buffering argument to the open() function when
creating the stdin/stdout/stderr pipe file objects
executable: A replacement program to execute.
stdin, stdout and stderr: These specify the executed programs' standard
input, standard output and standard error file handles, respectively.
preexec_fn: (POSIX only) An object to be called in the child process
just before the child is executed.
close_fds: Controls closing or inheriting of file descriptors.
shell: If true, the command will be executed through the shell.
cwd: Sets the current directory before the child is executed.
env: Defines the environment variables for the new process.
universal_newlines: If true, use universal line endings for file
objects stdin, stdout and stderr.
startupinfo and creationflags (Windows only)
restore_signals (POSIX only)
start_new_session (POSIX only)
pass_fds (POSIX only)
encoding and errors: Text mode encoding and error handling to use for
file objects stdin, stdout and stderr.
Attributes:
stdin, stdout, stderr, pid, returncode
"""
_child_created = False # Set here since __del__ checks it
def __init__(self, args, bufsize=-1, executable=None,
stdin=None, stdout=None, stderr=None,
preexec_fn=None, close_fds=_PLATFORM_DEFAULT_CLOSE_FDS,
shell=False, cwd=None, env=None, universal_newlines=False,
startupinfo=None, creationflags=0,
restore_signals=True, start_new_session=False,
pass_fds=(), *, encoding=None, errors=None):
"""Create new Popen instance."""
_cleanup()
# Held while anything is calling waitpid before returncode has been
# updated to prevent clobbering returncode if wait() or poll() are
# called from multiple threads at once. After acquiring the lock,
# code must re-check self.returncode to see if another thread just
# finished a waitpid() call.
self._waitpid_lock = threading.Lock()
self._input = None
self._communication_started = False
if bufsize is None:
bufsize = -1 # Restore default
if not isinstance(bufsize, int):
raise TypeError("bufsize must be an integer")
if _mswindows:
if preexec_fn is not None:
raise ValueError("preexec_fn is not supported on Windows "
"platforms")
any_stdio_set = (stdin is not None or stdout is not None or
stderr is not None)
if close_fds is _PLATFORM_DEFAULT_CLOSE_FDS:
if any_stdio_set:
close_fds = False
else:
close_fds = True
elif close_fds and any_stdio_set:
raise ValueError(
"close_fds is not supported on Windows platforms"
" if you redirect stdin/stdout/stderr")
else:
# POSIX
if close_fds is _PLATFORM_DEFAULT_CLOSE_FDS:
close_fds = True
if pass_fds and not close_fds:
warnings.warn("pass_fds overriding close_fds.", RuntimeWarning)
close_fds = True
if startupinfo is not None:
raise ValueError("startupinfo is only supported on Windows "
"platforms")
if creationflags != 0:
raise ValueError("creationflags is only supported on Windows "
"platforms")
self.args = args
self.stdin = None
self.stdout = None
self.stderr = None
self.pid = None
self.returncode = None
self.universal_newlines = universal_newlines
self.encoding = encoding
self.errors = errors
# Input and output objects. The general principle is like
# this:
#
# Parent Child
# ------ -----
# p2cwrite ---stdin---> p2cread
# c2pread <--stdout--- c2pwrite
# errread <--stderr--- errwrite
#
# On POSIX, the child objects are file descriptors. On
# Windows, these are Windows file handles. The parent objects
# are file descriptors on both platforms. The parent objects
# are -1 when not using PIPEs. The child objects are -1
# when not redirecting.
(p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
# We wrap OS handles *before* launching the child, otherwise a
# quickly terminating child could make our fds unwrappable
# (see #8458).
if _mswindows:
if p2cwrite != -1:
p2cwrite = msvcrt.open_osfhandle(p2cwrite.Detach(), 0)
if c2pread != -1:
c2pread = msvcrt.open_osfhandle(c2pread.Detach(), 0)
if errread != -1:
errread = msvcrt.open_osfhandle(errread.Detach(), 0)
text_mode = encoding or errors or universal_newlines
self._closed_child_pipe_fds = False
try:
if p2cwrite != -1:
self.stdin = io.open(p2cwrite, 'wb', bufsize)
if text_mode:
self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
line_buffering=(bufsize == 1),
encoding=encoding, errors=errors)
if c2pread != -1:
self.stdout = io.open(c2pread, 'rb', bufsize)
if text_mode:
self.stdout = io.TextIOWrapper(self.stdout,
encoding=encoding, errors=errors)
if errread != -1:
self.stderr = io.open(errread, 'rb', bufsize)
if text_mode:
self.stderr = io.TextIOWrapper(self.stderr,
encoding=encoding, errors=errors)
self._execute_child(args, executable, preexec_fn, close_fds,
pass_fds, cwd, env,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite,
restore_signals, start_new_session)
except:
# Cleanup if the child failed starting.
for f in filter(None, (self.stdin, self.stdout, self.stderr)):
try:
f.close()
except OSError:
pass # Ignore EBADF or other errors.
if not self._closed_child_pipe_fds:
to_close = []
if stdin == PIPE:
to_close.append(p2cread)
if stdout == PIPE:
to_close.append(c2pwrite)
if stderr == PIPE:
to_close.append(errwrite)
if hasattr(self, '_devnull'):
to_close.append(self._devnull)
for fd in to_close:
try:
if _mswindows and isinstance(fd, Handle):
fd.Close()
else:
os.close(fd)
except OSError:
pass
raise
def _translate_newlines(self, data, encoding, errors):
data = data.decode(encoding, errors)
return data.replace("\r\n", "\n").replace("\r", "\n")
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if self.stdout:
self.stdout.close()
if self.stderr:
self.stderr.close()
try: # Flushing a BufferedWriter may raise an error
if self.stdin:
self.stdin.close()
finally:
# Wait for the process to terminate, to avoid zombies.
self.wait()
def __del__(self, _maxsize=sys.maxsize, _warn=warnings.warn):
if not self._child_created:
# We didn't get to successfully create a child process.
return
if self.returncode is None:
# Not reading subprocess exit status creates a zombi process which
# is only destroyed at the parent python process exit
_warn("subprocess %s is still running" % self.pid,
ResourceWarning, source=self)
# In case the child hasn't been waited on, check if it's done.
self._internal_poll(_deadstate=_maxsize)
if self.returncode is None and _active is not None:
# Child is still running, keep us alive until we can wait on it.
_active.append(self)
def _get_devnull(self):
if not hasattr(self, '_devnull'):
self._devnull = os.open(os.devnull, os.O_RDWR)
return self._devnull
def _stdin_write(self, input):
if input:
try:
self.stdin.write(input)
except BrokenPipeError:
pass # communicate() must ignore broken pipe errors.
except OSError as exc:
if exc.errno == errno.EINVAL:
# bpo-19612, bpo-30418: On Windows, stdin.write() fails
# with EINVAL if the child process exited or if the child
# process is still running but closed the pipe.
pass
else:
raise
try:
self.stdin.close()
except BrokenPipeError:
pass # communicate() must ignore broken pipe errors.
except OSError as exc:
if exc.errno == errno.EINVAL:
pass
else:
raise
def communicate(self, input=None, timeout=None):
"""Interact with process: Send data to stdin. Read data from
stdout and stderr, until end-of-file is reached. Wait for
process to terminate.
The optional "input" argument should be data to be sent to the
child process (if self.universal_newlines is True, this should
be a string; if it is False, "input" should be bytes), or
None, if no data should be sent to the child.
communicate() returns a tuple (stdout, stderr). These will be
bytes or, if self.universal_newlines was True, a string.
"""
if self._communication_started and input:
raise ValueError("Cannot send input after starting communication")
# Optimization: If we are not worried about timeouts, we haven't
# started communicating, and we have one or zero pipes, using select()
# or threads is unnecessary.
if (timeout is None and not self._communication_started and
[self.stdin, self.stdout, self.stderr].count(None) >= 2):
stdout = None
stderr = None
if self.stdin:
self._stdin_write(input)
elif self.stdout:
stdout = self.stdout.read()
self.stdout.close()
elif self.stderr:
stderr = self.stderr.read()
self.stderr.close()
self.wait()
else:
if timeout is not None:
endtime = _time() + timeout
else:
endtime = None
try:
stdout, stderr = self._communicate(input, endtime, timeout)
finally:
self._communication_started = True
sts = self.wait(timeout=self._remaining_time(endtime))
return (stdout, stderr)
def poll(self):
"""Check if child process has terminated. Set and return returncode
attribute."""
return self._internal_poll()
def _remaining_time(self, endtime):
"""Convenience for _communicate when computing timeouts."""
if endtime is None:
return None
else:
return endtime - _time()
def _check_timeout(self, endtime, orig_timeout):
"""Convenience for checking if a timeout has expired."""
if endtime is None:
return
if _time() > endtime:
raise TimeoutExpired(self.args, orig_timeout)
if _mswindows:
#
# Windows methods
#
def _get_handles(self, stdin, stdout, stderr):
"""Construct and return tuple with IO objects:
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
"""
if stdin is None and stdout is None and stderr is None:
return (-1, -1, -1, -1, -1, -1)
p2cread, p2cwrite = -1, -1
c2pread, c2pwrite = -1, -1
errread, errwrite = -1, -1
if stdin is None:
p2cread = _winapi.GetStdHandle(_winapi.STD_INPUT_HANDLE)
if p2cread is None:
p2cread, _ = _winapi.CreatePipe(None, 0)
p2cread = Handle(p2cread)
_winapi.CloseHandle(_)
elif stdin == PIPE:
p2cread, p2cwrite = _winapi.CreatePipe(None, 0)
p2cread, p2cwrite = Handle(p2cread), Handle(p2cwrite)
elif stdin == DEVNULL:
p2cread = msvcrt.get_osfhandle(self._get_devnull())
elif isinstance(stdin, int):
p2cread = msvcrt.get_osfhandle(stdin)
else:
# Assuming file-like object
p2cread = msvcrt.get_osfhandle(stdin.fileno())
p2cread = self._make_inheritable(p2cread)
if stdout is None:
c2pwrite = _winapi.GetStdHandle(_winapi.STD_OUTPUT_HANDLE)
if c2pwrite is None:
_, c2pwrite = _winapi.CreatePipe(None, 0)
c2pwrite = Handle(c2pwrite)
_winapi.CloseHandle(_)
elif stdout == PIPE:
c2pread, c2pwrite = _winapi.CreatePipe(None, 0)
c2pread, c2pwrite = Handle(c2pread), Handle(c2pwrite)
elif stdout == DEVNULL:
c2pwrite = msvcrt.get_osfhandle(self._get_devnull())
elif isinstance(stdout, int):
c2pwrite = msvcrt.get_osfhandle(stdout)
else:
# Assuming file-like object
c2pwrite = msvcrt.get_osfhandle(stdout.fileno())
c2pwrite = self._make_inheritable(c2pwrite)
if stderr is None:
errwrite = _winapi.GetStdHandle(_winapi.STD_ERROR_HANDLE)
if errwrite is None:
_, errwrite = _winapi.CreatePipe(None, 0)
errwrite = Handle(errwrite)
_winapi.CloseHandle(_)
elif stderr == PIPE:
errread, errwrite = _winapi.CreatePipe(None, 0)
errread, errwrite = Handle(errread), Handle(errwrite)
elif stderr == STDOUT:
errwrite = c2pwrite
elif stderr == DEVNULL:
errwrite = msvcrt.get_osfhandle(self._get_devnull())
elif isinstance(stderr, int):
errwrite = msvcrt.get_osfhandle(stderr)
else:
# Assuming file-like object
errwrite = msvcrt.get_osfhandle(stderr.fileno())
errwrite = self._make_inheritable(errwrite)
return (p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite)
def _make_inheritable(self, handle):
"""Return a duplicate of handle, which is inheritable"""
h = _winapi.DuplicateHandle(
_winapi.GetCurrentProcess(), handle,
_winapi.GetCurrentProcess(), 0, 1,
_winapi.DUPLICATE_SAME_ACCESS)
return Handle(h)
def _execute_child(self, args, executable, preexec_fn, close_fds,
pass_fds, cwd, env,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite,
unused_restore_signals, unused_start_new_session):
"""Execute program (MS Windows version)"""
assert not pass_fds, "pass_fds not supported on Windows."
if not isinstance(args, str):
args = list2cmdline(args)
# Process startup details
if startupinfo is None:
startupinfo = STARTUPINFO()
if -1 not in (p2cread, c2pwrite, errwrite):
startupinfo.dwFlags |= _winapi.STARTF_USESTDHANDLES
startupinfo.hStdInput = p2cread
startupinfo.hStdOutput = c2pwrite
startupinfo.hStdError = errwrite