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cpython/Lib/subprocess.py
Guido van Rossum 98297ee781 Merging the py3k-pep3137 branch back into the py3k branch. 
No detailed change log; just check out the change log for the py3k-pep3137
branch.  The most obvious changes:

  - str8 renamed to bytes (PyString at the C level);
  - bytes renamed to buffer (PyBytes at the C level);
  - PyString and PyUnicode are no longer compatible.

I.e. we now have an immutable bytes type and a mutable bytes type.

The behavior of PyString was modified quite a bit, to make it more
bytes-like.  Some changes are still on the to-do list.
2007-11-06 21:34:58 +00:00

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# subprocess - Subprocesses with accessible I/O streams
#
# For more information about this module, see PEP 324.
#
# This module should remain compatible with Python 2.2, see PEP 291.
#
# 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"""subprocess - 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. This module
intends to replace several other, older modules and functions, like:
os.system
os.spawn*
commands.*
Information about how the subprocess module can be used to replace these
modules and functions can be found below.
Using the subprocess module
===========================
This module defines one class called Popen:
class Popen(args, bufsize=0, executable=None,
stdin=None, stdout=None, stderr=None,
preexec_fn=None, close_fds=False, shell=False,
cwd=None, env=None, universal_newlines=False,
startupinfo=None, creationflags=0):
Arguments are:
args should be a string, or a sequence of program arguments. The
program to execute is normally the first item in the args sequence or
string, but can be explicitly set by using the executable argument.
On UNIX, with shell=False (default): In this case, the Popen class
uses os.execvp() to execute the child program. args should normally
be a sequence. A string will be treated as a sequence with the string
as the only item (the program to execute).
On UNIX, with shell=True: If args is a string, it specifies the
command string to execute through the shell. If args is a sequence,
the first item specifies the command string, and any additional items
will be treated as additional shell arguments.
On Windows: the Popen class uses CreateProcess() to execute the child
program, which operates on strings. If args is a sequence, it will be
converted to a string using the list2cmdline method. Please note that
not all MS Windows applications interpret the command line the same
way: The list2cmdline is designed for applications using the same
rules as the MS C runtime.
bufsize, if given, has the same meaning as the corresponding argument
to the built-in open() function: 0 means unbuffered, 1 means line
buffered, any other positive value means use a buffer of
(approximately) that size. A negative bufsize means to use the system
default, which usually means fully buffered. The default value for
bufsize is 0 (unbuffered).
stdin, stdout and stderr specify the executed programs' standard
input, standard output and standard error file handles, respectively.
Valid values are PIPE, an existing file descriptor (a positive
integer), an existing file object, and None. PIPE indicates that a
new pipe to the child should be created. With None, no redirection
will occur; the child's file handles will be inherited from the
parent. Additionally, stderr can be STDOUT, which indicates that the
stderr data from the applications should be captured into the same
file handle as for stdout.
If preexec_fn is set to a callable object, this object will be called
in the child process just before the child is executed.
If close_fds is true, all file descriptors except 0, 1 and 2 will be
closed before the child process is executed.
if shell is true, the specified command will be executed through the
shell.
If cwd is not None, the current directory will be changed to cwd
before the child is executed.
If env is not None, it defines the environment variables for the new
process.
If universal_newlines is true, the file objects stdout and stderr are
opened as a text files, but lines may be terminated by any of '\n',
the Unix end-of-line convention, '\r', the Macintosh convention or
'\r\n', the Windows convention. All of these external representations
are seen as '\n' by the Python program. Note: This feature is only
available if Python is built with universal newline support (the
default). Also, the newlines attribute of the file objects stdout,
stdin and stderr are not updated by the communicate() method.
The startupinfo and creationflags, if given, will be passed to the
underlying CreateProcess() function. They can specify things such as
appearance of the main window and priority for the new process.
(Windows only)
This module also defines two shortcut functions:
call(*popenargs, **kwargs):
Run command with arguments. Wait for command to complete, then
return the returncode attribute.
The arguments are the same as for the Popen constructor. Example:
retcode = call(["ls", "-l"])
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 Popen constructor. Example:
check_call(["ls", "-l"])
Exceptions
----------
Exceptions raised in the child process, before the new program has
started to execute, will be re-raised in the parent. Additionally,
the exception object will have one extra attribute called
'child_traceback', which is a string containing traceback information
from the childs point of view.
The most common exception raised is OSError. This occurs, for
example, when trying to execute a non-existent file. Applications
should prepare for OSErrors.
A ValueError will be raised if Popen is called with invalid arguments.
check_call() will raise CalledProcessError, if the called process
returns a non-zero return code.
Security
--------
Unlike some other popen functions, this implementation will never call
/bin/sh implicitly. This means that all characters, including shell
metacharacters, can safely be passed to child processes.
Popen objects
=============
Instances of the Popen class have the following methods:
poll()
Check if child process has terminated. Returns returncode
attribute.
wait()
Wait for child process to terminate. Returns returncode attribute.
communicate(input=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 a string to be
sent to the child process, or None, if no data should be sent to
the child.
communicate() returns a tuple (stdout, stderr).
Note: The data read is buffered in memory, so do not use this
method if the data size is large or unlimited.
The following attributes are also available:
stdin
If the stdin argument is PIPE, this attribute is a file object
that provides input to the child process. Otherwise, it is None.
stdout
If the stdout argument is PIPE, this attribute is a file object
that provides output from the child process. Otherwise, it is
None.
stderr
If the stderr argument is PIPE, this attribute is file object that
provides error output from the child process. Otherwise, it is
None.
pid
The process ID of the child process.
returncode
The child return code. A None value indicates that the process
hasn't terminated yet. A negative value -N indicates that the
child was terminated by signal N (UNIX only).
Replacing older functions with the subprocess module
====================================================
In this section, "a ==> b" means that b can be used as a replacement
for a.
Note: All functions in this section fail (more or less) silently if
the executed program cannot be found; this module raises an OSError
exception.
In the following examples, we assume that the subprocess module is
imported with "from subprocess import *".
Replacing /bin/sh shell backquote
---------------------------------
output=`mycmd myarg`
==>
output = Popen(["mycmd", "myarg"], stdout=PIPE).communicate()[0]
Replacing shell pipe line
-------------------------
output=`dmesg | grep hda`
==>
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
output = p2.communicate()[0]
Replacing os.system()
---------------------
sts = os.system("mycmd" + " myarg")
==>
p = Popen("mycmd" + " myarg", shell=True)
pid, sts = os.waitpid(p.pid, 0)
Note:
* Calling the program through the shell is usually not required.
* It's easier to look at the returncode attribute than the
exitstatus.
A more real-world example would look like this:
try:
retcode = call("mycmd" + " myarg", shell=True)
if retcode < 0:
print("Child was terminated by signal", -retcode, file=sys.stderr)
else:
print("Child returned", retcode, file=sys.stderr)
except OSError as e:
print("Execution failed:", e, file=sys.stderr)
Replacing os.spawn*
-------------------
P_NOWAIT example:
pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
==>
pid = Popen(["/bin/mycmd", "myarg"]).pid
P_WAIT example:
retcode = os.spawnlp(os.P_WAIT, "/bin/mycmd", "mycmd", "myarg")
==>
retcode = call(["/bin/mycmd", "myarg"])
Vector example:
os.spawnvp(os.P_NOWAIT, path, args)
==>
Popen([path] + args[1:])
Environment example:
os.spawnlpe(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg", env)
==>
Popen(["/bin/mycmd", "myarg"], env={"PATH": "/usr/bin"})
"""
import sys
mswindows = (sys.platform == "win32")
import io
import os
import traceback
# Exception classes used by this module.
class CalledProcessError(Exception):
"""This exception is raised when a process run by check_call() returns
a non-zero exit status. The exit status will be stored in the
returncode attribute."""
def __init__(self, returncode, cmd):
self.returncode = returncode
self.cmd = cmd
def __str__(self):
return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)
if mswindows:
import threading
import msvcrt
if 0: # <-- change this to use pywin32 instead of the _subprocess driver
import pywintypes
from win32api import GetStdHandle, STD_INPUT_HANDLE, \
STD_OUTPUT_HANDLE, STD_ERROR_HANDLE
from win32api import GetCurrentProcess, DuplicateHandle, \
GetModuleFileName, GetVersion
from win32con import DUPLICATE_SAME_ACCESS, SW_HIDE
from win32pipe import CreatePipe
from win32process import CreateProcess, STARTUPINFO, \
GetExitCodeProcess, STARTF_USESTDHANDLES, \
STARTF_USESHOWWINDOW, CREATE_NEW_CONSOLE
from win32event import WaitForSingleObject, INFINITE, WAIT_OBJECT_0
else:
from _subprocess import *
class STARTUPINFO:
dwFlags = 0
hStdInput = None
hStdOutput = None
hStdError = None
wShowWindow = 0
class pywintypes:
error = IOError
else:
import select
import errno
import fcntl
import pickle
__all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", "CalledProcessError"]
try:
MAXFD = os.sysconf("SC_OPEN_MAX")
except:
MAXFD = 256
_active = []
def _cleanup():
for inst in _active[:]:
res = inst.poll(_deadstate=sys.maxint)
if res is not None and res >= 0:
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
def call(*popenargs, **kwargs):
"""Run command with arguments. Wait for command to complete, then
return the returncode attribute.
The arguments are the same as for the Popen constructor. Example:
retcode = call(["ls", "-l"])
"""
return Popen(*popenargs, **kwargs).wait()
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 Popen constructor. Example:
check_call(["ls", "-l"])
"""
retcode = call(*popenargs, **kwargs)
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
if retcode:
raise CalledProcessError(retcode, cmd)
return retcode
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/library/en-us/vccelng/htm/progs_12.asp
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 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 backspaces.
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 backspaces, if any.
if bs_buf:
result.extend(bs_buf)
if needquote:
result.extend(bs_buf)
result.append('"')
return ''.join(result)
class Popen(object):
def __init__(self, args, bufsize=0, executable=None,
stdin=None, stdout=None, stderr=None,
preexec_fn=None, close_fds=False, shell=False,
cwd=None, env=None, universal_newlines=False,
startupinfo=None, creationflags=0):
"""Create new Popen instance."""
_cleanup()
self._child_created = False
if bufsize is None:
bufsize = 0 # 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")
if close_fds and (stdin is not None or stdout is not None or
stderr is not None):
raise ValueError("close_fds is not supported on Windows "
"platforms if you redirect stdin/stdout/stderr")
else:
# POSIX
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.stdin = None
self.stdout = None
self.stderr = None
self.pid = None
self.returncode = None
self.universal_newlines = universal_newlines
# 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 None when not using PIPEs. The child objects are None
# when not redirecting.
(p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
self._execute_child(args, executable, preexec_fn, close_fds,
cwd, env, universal_newlines,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite)
# On Windows, you cannot just redirect one or two handles: You
# either have to redirect all three or none. If the subprocess
# user has only redirected one or two handles, we are
# automatically creating PIPEs for the rest. We should close
# these after the process is started. See bug #1124861.
if mswindows:
if stdin is None and p2cwrite is not None:
os.close(p2cwrite)
p2cwrite = None
if stdout is None and c2pread is not None:
os.close(c2pread)
c2pread = None
if stderr is None and errread is not None:
os.close(errread)
errread = None
if bufsize == 0:
bufsize = 1 # Nearly unbuffered (XXX for now)
if p2cwrite is not None:
self.stdin = io.open(p2cwrite, 'wb', bufsize)
if self.universal_newlines:
self.stdin = io.TextIOWrapper(self.stdin)
if c2pread is not None:
self.stdout = io.open(c2pread, 'rb', bufsize)
if universal_newlines:
self.stdout = io.TextIOWrapper(self.stdout)
if errread is not None:
self.stderr = io.open(errread, 'rb', bufsize)
if universal_newlines:
self.stderr = io.TextIOWrapper(self.stderr)
def _translate_newlines(self, data, encoding):
data = data.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
return data.decode(encoding)
def __del__(self, sys=sys):
if not self._child_created:
# We didn't get to successfully create a child process.
return
# In case the child hasn't been waited on, check if it's done.
self.poll(_deadstate=sys.maxint)
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 communicate(self, input=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 a
string to be sent to the child process, or None, if no data
should be sent to the child.
communicate() returns a tuple (stdout, stderr)."""
# Optimization: If we are only using one pipe, or no pipe at
# all, using select() or threads is unnecessary.
if [self.stdin, self.stdout, self.stderr].count(None) >= 2:
stdout = None
stderr = None
if self.stdin:
if input:
self.stdin.write(input)
self.stdin.close()
elif self.stdout:
stdout = self.stdout.read()
elif self.stderr:
stderr = self.stderr.read()
self.wait()
return (stdout, stderr)
return self._communicate(input)
if mswindows:
#
# Windows methods
#
def _get_handles(self, stdin, stdout, stderr):
"""Construct and return tupel with IO objects:
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
"""
if stdin is None and stdout is None and stderr is None:
return (None, None, None, None, None, None)
p2cread, p2cwrite = None, None
c2pread, c2pwrite = None, None
errread, errwrite = None, None
if stdin is None:
p2cread = GetStdHandle(STD_INPUT_HANDLE)
if p2cread is not None:
pass
elif stdin is None or stdin == PIPE:
p2cread, p2cwrite = CreatePipe(None, 0)
# Detach and turn into fd
p2cwrite = p2cwrite.Detach()
p2cwrite = msvcrt.open_osfhandle(p2cwrite, 0)
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 = GetStdHandle(STD_OUTPUT_HANDLE)
if c2pwrite is not None:
pass
elif stdout is None or stdout == PIPE:
c2pread, c2pwrite = CreatePipe(None, 0)
# Detach and turn into fd
c2pread = c2pread.Detach()
c2pread = msvcrt.open_osfhandle(c2pread, 0)
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 = GetStdHandle(STD_ERROR_HANDLE)
if errwrite is not None:
pass
elif stderr is None or stderr == PIPE:
errread, errwrite = CreatePipe(None, 0)
# Detach and turn into fd
errread = errread.Detach()
errread = msvcrt.open_osfhandle(errread, 0)
elif stderr == STDOUT:
errwrite = c2pwrite
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"""
return DuplicateHandle(GetCurrentProcess(), handle,
GetCurrentProcess(), 0, 1,
DUPLICATE_SAME_ACCESS)
def _find_w9xpopen(self):
"""Find and return absolut path to w9xpopen.exe"""
w9xpopen = os.path.join(os.path.dirname(GetModuleFileName(0)),
"w9xpopen.exe")
if not os.path.exists(w9xpopen):
# Eeek - file-not-found - possibly an embedding
# situation - see if we can locate it in sys.exec_prefix
w9xpopen = os.path.join(os.path.dirname(sys.exec_prefix),
"w9xpopen.exe")
if not os.path.exists(w9xpopen):
raise RuntimeError("Cannot locate w9xpopen.exe, which is "
"needed for Popen to work with your "
"shell or platform.")
return w9xpopen
def _execute_child(self, args, executable, preexec_fn, close_fds,
cwd, env, universal_newlines,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite):
"""Execute program (MS Windows version)"""
if not isinstance(args, str):
args = list2cmdline(args)
# Process startup details
if startupinfo is None:
startupinfo = STARTUPINFO()
if None not in (p2cread, c2pwrite, errwrite):
startupinfo.dwFlags |= STARTF_USESTDHANDLES
startupinfo.hStdInput = p2cread
startupinfo.hStdOutput = c2pwrite
startupinfo.hStdError = errwrite
if shell:
startupinfo.dwFlags |= STARTF_USESHOWWINDOW
startupinfo.wShowWindow = SW_HIDE
comspec = os.environ.get("COMSPEC", "cmd.exe")
args = comspec + " /c " + args
if (GetVersion() >= 0x80000000 or
os.path.basename(comspec).lower() == "command.com"):
# Win9x, or using command.com on NT. We need to
# use the w9xpopen intermediate program. For more
# information, see KB Q150956
# (http://web.archive.org/web/20011105084002/http://support.microsoft.com/support/kb/articles/Q150/9/56.asp)
w9xpopen = self._find_w9xpopen()
args = '"%s" %s' % (w9xpopen, args)
# Not passing CREATE_NEW_CONSOLE has been known to
# cause random failures on win9x. Specifically a
# dialog: "Your program accessed mem currently in
# use at xxx" and a hopeful warning about the
# stability of your system. Cost is Ctrl+C wont
# kill children.
creationflags |= CREATE_NEW_CONSOLE
# Start the process
try:
hp, ht, pid, tid = CreateProcess(executable, args,
# no special security
None, None,
int(not close_fds),
creationflags,
env,
cwd,
startupinfo)
except pywintypes.error as e:
# Translate pywintypes.error to WindowsError, which is
# a subclass of OSError. FIXME: We should really
# translate errno using _sys_errlist (or simliar), but
# how can this be done from Python?
raise WindowsError(*e.args)
# Retain the process handle, but close the thread handle
self._child_created = True
self._handle = hp
self.pid = pid
ht.Close()
# Child is launched. Close the parent's copy of those pipe
# handles that only the child should have open. You need
# to make sure that no handles to the write end of the
# output pipe are maintained in this process or else the
# pipe will not close when the child process exits and the
# ReadFile will hang.
if p2cread is not None:
p2cread.Close()
if c2pwrite is not None:
c2pwrite.Close()
if errwrite is not None:
errwrite.Close()
def poll(self, _deadstate=None):
"""Check if child process has terminated. Returns returncode
attribute."""
if self.returncode is None:
if WaitForSingleObject(self._handle, 0) == WAIT_OBJECT_0:
self.returncode = GetExitCodeProcess(self._handle)
return self.returncode
def wait(self):
"""Wait for child process to terminate. Returns returncode
attribute."""
if self.returncode is None:
obj = WaitForSingleObject(self._handle, INFINITE)
self.returncode = GetExitCodeProcess(self._handle)
return self.returncode
def _readerthread(self, fh, buffer):
buffer.append(fh.read())
def _communicate(self, input):
stdout = None # Return
stderr = None # Return
if self.stdout:
stdout = []
stdout_thread = threading.Thread(target=self._readerthread,
args=(self.stdout, stdout))
stdout_thread.setDaemon(True)
stdout_thread.start()
if self.stderr:
stderr = []
stderr_thread = threading.Thread(target=self._readerthread,
args=(self.stderr, stderr))
stderr_thread.setDaemon(True)
stderr_thread.start()
if self.stdin:
if input is not None:
if isinstance(input, str):
input = input.encode()
self.stdin.write(input)
self.stdin.close()
if self.stdout:
stdout_thread.join()
if self.stderr:
stderr_thread.join()
# All data exchanged. Translate lists into strings.
if stdout is not None:
stdout = stdout[0]
if stderr is not None:
stderr = stderr[0]
self.wait()
return (stdout, stderr)
else:
#
# POSIX methods
#
def _get_handles(self, stdin, stdout, stderr):
"""Construct and return tupel with IO objects:
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
"""
p2cread, p2cwrite = None, None
c2pread, c2pwrite = None, None
errread, errwrite = None, None
if stdin is None:
pass
elif stdin == PIPE:
p2cread, p2cwrite = os.pipe()
elif isinstance(stdin, int):
p2cread = stdin
else:
# Assuming file-like object
p2cread = stdin.fileno()
if stdout is None:
pass
elif stdout == PIPE:
c2pread, c2pwrite = os.pipe()
elif isinstance(stdout, int):
c2pwrite = stdout
else:
# Assuming file-like object
c2pwrite = stdout.fileno()
if stderr is None:
pass
elif stderr == PIPE:
errread, errwrite = os.pipe()
elif stderr == STDOUT:
errwrite = c2pwrite
elif isinstance(stderr, int):
errwrite = stderr
else:
# Assuming file-like object
errwrite = stderr.fileno()
return (p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite)
def _set_cloexec_flag(self, fd):
try:
cloexec_flag = fcntl.FD_CLOEXEC
except AttributeError:
cloexec_flag = 1
old = fcntl.fcntl(fd, fcntl.F_GETFD)
fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)
def _close_fds(self, but):
for i in range(3, MAXFD):
if i == but:
continue
try:
os.close(i)
except:
pass
def _execute_child(self, args, executable, preexec_fn, close_fds,
cwd, env, universal_newlines,
startupinfo, creationflags, shell,
p2cread, p2cwrite,
c2pread, c2pwrite,
errread, errwrite):
"""Execute program (POSIX version)"""
if isinstance(args, str):
args = [args]
else:
args = list(args)
if shell:
args = ["/bin/sh", "-c"] + args
if executable is None:
executable = args[0]
# For transferring possible exec failure from child to parent
# The first char specifies the exception type: 0 means
# OSError, 1 means some other error.
errpipe_read, errpipe_write = os.pipe()
self._set_cloexec_flag(errpipe_write)
self.pid = os.fork()
self._child_created = True
if self.pid == 0:
# Child
try:
# Close parent's pipe ends
if p2cwrite is not None:
os.close(p2cwrite)
if c2pread is not None:
os.close(c2pread)
if errread is not None:
os.close(errread)
os.close(errpipe_read)
# Dup fds for child
if p2cread is not None:
os.dup2(p2cread, 0)
if c2pwrite is not None:
os.dup2(c2pwrite, 1)
if errwrite is not None:
os.dup2(errwrite, 2)
# Close pipe fds. Make sure we don't close the same
# fd more than once, or standard fds.
if p2cread is not None and p2cread not in (0,):
os.close(p2cread)
if c2pwrite is not None and c2pwrite not in (p2cread, 1):
os.close(c2pwrite)
if (errwrite is not None and
errwrite not in (p2cread, c2pwrite, 2)):
os.close(errwrite)
# Close all other fds, if asked for
if close_fds:
self._close_fds(but=errpipe_write)
if cwd is not None:
os.chdir(cwd)
if preexec_fn:
preexec_fn()
if env is None:
os.execvp(executable, args)
else:
os.execvpe(executable, args, env)
except:
exc_type, exc_value, tb = sys.exc_info()
# Save the traceback and attach it to the exception object
exc_lines = traceback.format_exception(exc_type,
exc_value,
tb)
exc_value.child_traceback = ''.join(exc_lines)
os.write(errpipe_write, pickle.dumps(exc_value))
# This exitcode won't be reported to applications, so it
# really doesn't matter what we return.
os._exit(255)
# Parent
os.close(errpipe_write)
if p2cread is not None and p2cwrite is not None:
os.close(p2cread)
if c2pwrite is not None and c2pread is not None:
os.close(c2pwrite)
if errwrite is not None and errread is not None:
os.close(errwrite)
# Wait for exec to fail or succeed; possibly raising exception
data = os.read(errpipe_read, 1048576) # Exceptions limited to 1 MB
os.close(errpipe_read)
if data:
os.waitpid(self.pid, 0)
child_exception = pickle.loads(data)
raise child_exception
def _handle_exitstatus(self, sts):
if os.WIFSIGNALED(sts):
self.returncode = -os.WTERMSIG(sts)
elif os.WIFEXITED(sts):
self.returncode = os.WEXITSTATUS(sts)
else:
# Should never happen
raise RuntimeError("Unknown child exit status!")
def poll(self, _deadstate=None):
"""Check if child process has terminated. Returns returncode
attribute."""
if self.returncode is None:
try:
pid, sts = os.waitpid(self.pid, os.WNOHANG)
if pid == self.pid:
self._handle_exitstatus(sts)
except os.error:
if _deadstate is not None:
self.returncode = _deadstate
return self.returncode
def wait(self):
"""Wait for child process to terminate. Returns returncode
attribute."""
if self.returncode is None:
pid, sts = os.waitpid(self.pid, 0)
self._handle_exitstatus(sts)
return self.returncode
def _communicate(self, input):
if self.stdin:
if isinstance(input, str): # Unicode
input = input.encode("utf-8") # XXX What else?
input = bytes(input)
read_set = []
write_set = []
stdout = None # Return
stderr = None # Return
if self.stdin:
# Flush stdio buffer. This might block, if the user has
# been writing to .stdin in an uncontrolled fashion.
self.stdin.flush()
if input:
write_set.append(self.stdin)
else:
self.stdin.close()
if self.stdout:
read_set.append(self.stdout)
stdout = []
if self.stderr:
read_set.append(self.stderr)
stderr = []
input_offset = 0
while read_set or write_set:
rlist, wlist, xlist = select.select(read_set, write_set, [])
# XXX Rewrite these to use non-blocking I/O on the
# file objects; they are no longer using C stdio!
if self.stdin in wlist:
# When select has indicated that the file is writable,
# we can write up to PIPE_BUF bytes without risk
# blocking. POSIX defines PIPE_BUF >= 512
chunk = input[input_offset : input_offset + 512]
bytes_written = os.write(self.stdin.fileno(), chunk)
input_offset += bytes_written
if input_offset >= len(input):
self.stdin.close()
write_set.remove(self.stdin)
if self.stdout in rlist:
data = os.read(self.stdout.fileno(), 1024)
if not data:
self.stdout.close()
read_set.remove(self.stdout)
stdout.append(data)
if self.stderr in rlist:
data = os.read(self.stderr.fileno(), 1024)
if not data:
self.stderr.close()
read_set.remove(self.stderr)
stderr.append(data)
# All data exchanged. Translate lists into strings.
if stdout is not None:
stdout = b"".join(stdout)
if stderr is not None:
stderr = b"".join(stderr)
# Translate newlines, if requested.
# This also turns bytes into strings.
if self.universal_newlines:
if stdout is not None:
stdout = self._translate_newlines(stdout,
self.stdout.encoding)
if stderr is not None:
stderr = self._translate_newlines(stderr,
self.stderr.encoding)
self.wait()
return (stdout, stderr)
def _demo_posix():
#
# Example 1: Simple redirection: Get process list
#
plist = Popen(["ps"], stdout=PIPE).communicate()[0]
print("Process list:")
print(plist)
#
# Example 2: Change uid before executing child
#
if os.getuid() == 0:
p = Popen(["id"], preexec_fn=lambda: os.setuid(100))
p.wait()
#
# Example 3: Connecting several subprocesses
#
print("Looking for 'hda'...")
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
print(repr(p2.communicate()[0]))
#
# Example 4: Catch execution error
#
print()
print("Trying a weird file...")
try:
print(Popen(["/this/path/does/not/exist"]).communicate())
except OSError as e:
if e.errno == errno.ENOENT:
print("The file didn't exist. I thought so...")
print("Child traceback:")
print(e.child_traceback)
else:
print("Error", e.errno)
else:
print("Gosh. No error.", file=sys.stderr)
def _demo_windows():
#
# Example 1: Connecting several subprocesses
#
print("Looking for 'PROMPT' in set output...")
p1 = Popen("set", stdout=PIPE, shell=True)
p2 = Popen('find "PROMPT"', stdin=p1.stdout, stdout=PIPE)
print(repr(p2.communicate()[0]))
#
# Example 2: Simple execution of program
#
print("Executing calc...")
p = Popen("calc")
p.wait()
if __name__ == "__main__":
if mswindows:
_demo_windows()
else:
_demo_posix()
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