| # 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/3.3/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 |
| """ |
| |
| # because ambari_commons also has 'exceptions' module |
| from __future__ import absolute_import |
| |
| import sys |
| mswindows = (sys.platform == "win32") |
| |
| import os |
| import exceptions |
| import types |
| import time |
| import traceback |
| import gc |
| import signal |
| |
| # 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_getter(self): |
| """Alias for output attribute, to match stderr""" |
| return self.output |
| |
| #@stdout.setter # Required Python 2.6 |
| def __stdout_setter(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 |
| |
| stdout = property(__stdout_getter, __stdout_setter) # Python 2.4 |
| |
| |
| 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_getter(self): |
| return self.output |
| |
| #@stdout.setter # Required Python 2.6 |
| def __stdout_setter(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 |
| |
| stdout = property(__stdout_getter, __stdout_setter) # Python 2.4 |
| |
| |
| if mswindows: |
| import threading |
| import msvcrt |
| import _subprocess |
| class STARTUPINFO: |
| dwFlags = 0 |
| hStdInput = None |
| hStdOutput = None |
| hStdError = None |
| wShowWindow = 0 |
| class pywintypes: |
| error = IOError |
| else: |
| import select |
| _has_poll = hasattr(select, 'poll') |
| import errno |
| import fcntl |
| import pickle |
| import platform |
| import importlib |
| |
| posixsubprocess_package = "ambari_commons.libs.{0}".format(platform.machine()) |
| try: |
| _posixsubprocess = importlib.import_module('._posixsubprocess', posixsubprocess_package) |
| except ImportError: |
| _posixsubprocess = None |
| import warnings |
| warnings.warn("The _posixsubprocess module is not being used. Could not import it from " + posixsubprocess_package + " " |
| "Child process reliability may suffer if your " |
| "program uses threads.", RuntimeWarning) |
| 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) |
| |
| _FD_CLOEXEC = getattr(fcntl, 'FD_CLOEXEC', 1) |
| |
| def _set_cloexec(fd, cloexec): |
| old = fcntl.fcntl(fd, fcntl.F_GETFD) |
| if cloexec: |
| fcntl.fcntl(fd, fcntl.F_SETFD, old | _FD_CLOEXEC) |
| else: |
| fcntl.fcntl(fd, fcntl.F_SETFD, old & ~_FD_CLOEXEC) |
| |
| if _posixsubprocess: |
| _create_pipe = _posixsubprocess.cloexec_pipe |
| else: |
| def _create_pipe(): |
| fds = os.pipe() |
| _set_cloexec(fds[0], True) |
| _set_cloexec(fds[1], True) |
| return fds |
| |
| __all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", |
| "check_output", "CalledProcessError"] |
| |
| if mswindows: |
| from _subprocess import (CREATE_NEW_CONSOLE, CREATE_NEW_PROCESS_GROUP, |
| STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, |
| STD_ERROR_HANDLE, SW_HIDE, |
| STARTF_USESTDHANDLES, STARTF_USESHOWWINDOW) |
| # https://msdn.microsoft.com/en-us/library/windows/desktop/ms687032(v=vs.85).aspx |
| # Note: In Python 3.3 this constant is found in the _winapi module. |
| _WAIT_TIMEOUT = 0x102 |
| |
| __all__.extend(["CREATE_NEW_CONSOLE", "CREATE_NEW_PROCESS_GROUP", |
| "STD_INPUT_HANDLE", "STD_OUTPUT_HANDLE", |
| "STD_ERROR_HANDLE", "SW_HIDE", |
| "STARTF_USESTDHANDLES", "STARTF_USESHOWWINDOW"]) |
| try: |
| MAXFD = os.sysconf("SC_OPEN_MAX") |
| except: |
| MAXFD = 256 |
| |
| # 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.maxint) |
| 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 |
| |
| # This function is only used by multiprocessing, it is here so that people |
| # can drop subprocess32 in as a replacement for the stdlib subprocess module. |
| |
| def _args_from_interpreter_flags(): |
| """Return a list of command-line arguments reproducing the current |
| settings in sys.flags and sys.warnoptions.""" |
| flag_opt_map = { |
| 'debug': 'd', |
| # 'inspect': 'i', |
| # 'interactive': 'i', |
| 'optimize': 'O', |
| 'dont_write_bytecode': 'B', |
| 'no_user_site': 's', |
| 'no_site': 'S', |
| 'ignore_environment': 'E', |
| 'verbose': 'v', |
| 'bytes_warning': 'b', |
| 'py3k_warning': '3', |
| } |
| args = [] |
| for flag, opt in flag_opt_map.items(): |
| v = getattr(sys.flags, flag) |
| if v > 0: |
| args.append('-' + opt * v) |
| if getattr(sys.flags, 'hash_randomization') != 0: |
| args.append('-R') |
| for opt in sys.warnoptions: |
| args.append('-W' + opt) |
| return args |
| |
| |
| def _eintr_retry_call(func, *args): |
| while True: |
| try: |
| return func(*args) |
| except (OSError, IOError), e: |
| if e.errno == errno.EINTR: |
| continue |
| raise |
| |
| |
| def _get_exec_path(env=None): |
| """Returns the sequence of directories that will be searched for the |
| named executable (similar to a shell) when launching a process. |
| |
| *env* must be an environment variable dict or None. If *env* is None, |
| os.environ will be used. |
| """ |
| if env is None: |
| env = os.environ |
| return env.get('PATH', os.defpath).split(os.pathsep) |
| |
| |
| if hasattr(os, 'get_exec_path'): |
| _get_exec_path = os.get_exec_path |
| |
| |
| def call(*popenargs, **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"]) |
| """ |
| timeout = kwargs.pop('timeout', None) |
| p = Popen(*popenargs, **kwargs) |
| try: |
| return p.wait(timeout=timeout) |
| except TimeoutExpired: |
| 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, **kwargs): |
| r"""Run command with arguments and return its output as a byte string. |
| |
| 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"]) |
| '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) |
| 'ls: non_existent_file: No such file or directory\n' |
| """ |
| timeout = kwargs.pop('timeout', None) |
| if 'stdout' in kwargs: |
| raise ValueError('stdout argument not allowed, it will be overridden.') |
| process = Popen(stdout=PIPE, *popenargs, **kwargs) |
| try: |
| output, unused_err = process.communicate(timeout=timeout) |
| except TimeoutExpired: |
| process.kill() |
| output, unused_err = process.communicate() |
| raise TimeoutExpired(process.args, timeout, output=output) |
| retcode = process.poll() |
| if retcode: |
| raise CalledProcessError(retcode, process.args, output=output) |
| return output |
| |
| |
| 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, **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. |
| """ |
| input = kwargs.pop('input', None) |
| timeout = kwargs.pop('timeout', None) |
| check = kwargs.pop('check', False) |
| if input is not None: |
| if 'stdin' in kwargs: |
| raise ValueError('stdin and input arguments may not both be used.') |
| kwargs['stdin'] = PIPE |
| |
| process = Popen(*popenargs, **kwargs) |
| try: |
| process.__enter__() # No-Op really... illustrate "with in 2.4" |
| 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) |
| finally: |
| # None because our context manager __exit__ does not use them. |
| process.__exit__(None, None, None) |
| 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) |
| |
| |
| _PLATFORM_DEFAULT_CLOSE_FDS = object() |
| |
| |
| class Popen(object): |
| def __init__(self, args, bufsize=0, 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=()): |
| """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._child_created = False |
| self._input = None |
| self._communication_started = False |
| if not isinstance(bufsize, (int, long)): |
| 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 |
| |
| # 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) |
| |
| 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) |
| |
| if p2cwrite != -1: |
| self.stdin = os.fdopen(p2cwrite, 'wb', bufsize) |
| if c2pread != -1: |
| if universal_newlines: |
| self.stdout = os.fdopen(c2pread, 'rU', bufsize) |
| else: |
| self.stdout = os.fdopen(c2pread, 'rb', bufsize) |
| if errread != -1: |
| if universal_newlines: |
| self.stderr = os.fdopen(errread, 'rU', bufsize) |
| else: |
| self.stderr = os.fdopen(errread, 'rb', bufsize) |
| |
| self._closed_child_pipe_fds = False |
| exception_cleanup_needed = False |
| try: |
| try: |
| self._execute_child(args, executable, preexec_fn, close_fds, |
| pass_fds, cwd, env, universal_newlines, |
| startupinfo, creationflags, shell, |
| p2cread, p2cwrite, |
| c2pread, c2pwrite, |
| errread, errwrite, |
| restore_signals, start_new_session) |
| except: |
| # The cleanup is performed within the finally block rather |
| # than simply within this except block before the raise so |
| # that any exceptions raised and handled within it do not |
| # clobber the exception context we want to propagate upwards. |
| # This is only necessary in Python 2. |
| exception_cleanup_needed = True |
| raise |
| finally: |
| if exception_cleanup_needed: |
| for f in filter(None, (self.stdin, self.stdout, self.stderr)): |
| try: |
| f.close() |
| except EnvironmentError: |
| 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: |
| os.close(fd) |
| except EnvironmentError: |
| pass |
| |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, type, value, traceback): |
| if self.stdout: |
| self.stdout.close() |
| if self.stderr: |
| self.stderr.close() |
| if self.stdin: |
| self.stdin.close() |
| # Wait for the process to terminate, to avoid zombies. |
| self.wait() |
| |
| def _translate_newlines(self, data): |
| data = data.replace("\r\n", "\n") |
| data = data.replace("\r", "\n") |
| return data |
| |
| |
| def __del__(self, _maxint=sys.maxint, _active=_active): |
| # If __init__ hasn't had a chance to execute (e.g. if it |
| # was passed an undeclared keyword argument), we don't |
| # have a _child_created attribute at all. |
| if not getattr(self, '_child_created', False): |
| # 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._internal_poll(_deadstate=_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 _get_devnull(self): |
| if not hasattr(self, '_devnull'): |
| self._devnull = os.open(os.devnull, os.O_RDWR) |
| return self._devnull |
| |
| |
| 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 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).""" |
| |
| if self._communication_started and input: |
| raise ValueError("Cannot send input after starting communication") |
| |
| if timeout is not None: |
| endtime = time.time() + timeout |
| else: |
| endtime = None |
| |
| # 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 (endtime is None and not self._communication_started and |
| [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 = _eintr_retry_call(self.stdout.read) |
| self.stdout.close() |
| elif self.stderr: |
| stderr = _eintr_retry_call(self.stderr.read) |
| self.stderr.close() |
| self.wait() |
| return (stdout, stderr) |
| |
| 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): |
| 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.time() |
| |
| |
| def _check_timeout(self, endtime, orig_timeout): |
| """Convenience for checking if a timeout has expired.""" |
| if endtime is None: |
| return |
| if time.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 = _subprocess.GetStdHandle(_subprocess.STD_INPUT_HANDLE) |
| if p2cread is None: |
| p2cread, _ = _subprocess.CreatePipe(None, 0) |
| elif stdin == PIPE: |
| p2cread, p2cwrite = _subprocess.CreatePipe(None, 0) |
| 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 = _subprocess.GetStdHandle(_subprocess.STD_OUTPUT_HANDLE) |
| if c2pwrite is None: |
| _, c2pwrite = _subprocess.CreatePipe(None, 0) |
| elif stdout == PIPE: |
| c2pread, c2pwrite = _subprocess.CreatePipe(None, 0) |
| 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 = _subprocess.GetStdHandle(_subprocess.STD_ERROR_HANDLE) |
| if errwrite is None: |
| _, errwrite = _subprocess.CreatePipe(None, 0) |
| elif stderr == PIPE: |
| errread, errwrite = _subprocess.CreatePipe(None, 0) |
| 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""" |
| return _subprocess.DuplicateHandle(_subprocess.GetCurrentProcess(), |
| handle, _subprocess.GetCurrentProcess(), 0, 1, |
| _subprocess.DUPLICATE_SAME_ACCESS) |
| |
| |
| def _find_w9xpopen(self): |
| """Find and return absolut path to w9xpopen.exe""" |
| w9xpopen = os.path.join( |
| os.path.dirname(_subprocess.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, |
| pass_fds, cwd, env, universal_newlines, |
| 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, types.StringTypes): |
| args = list2cmdline(args) |
| |
| # Process startup details |
| if startupinfo is None: |
| startupinfo = STARTUPINFO() |
| if -1 not in (p2cread, c2pwrite, errwrite): |
| startupinfo.dwFlags |= _subprocess.STARTF_USESTDHANDLES |
| startupinfo.hStdInput = p2cread |
| startupinfo.hStdOutput = c2pwrite |
| startupinfo.hStdError = errwrite |
| |
| if shell: |
| startupinfo.dwFlags |= _subprocess.STARTF_USESHOWWINDOW |
| startupinfo.wShowWindow = _subprocess.SW_HIDE |
| comspec = os.environ.get("COMSPEC", "cmd.exe") |
| args = comspec + " /c " + '"%s"' % args |
| if (_subprocess.GetVersion() >= 0x80000000L 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 |= _subprocess.CREATE_NEW_CONSOLE |
| |
| # Start the process |
| try: |
| try: |
| hp, ht, pid, tid = _subprocess.CreateProcess(executable, args, |
| # no special security |
| None, None, |
| int(not close_fds), |
| creationflags, |
| env, |
| cwd, |
| startupinfo) |
| except pywintypes.error, e: |
| # Translate pywintypes.error to WindowsError, which is |
| # a subclass of OSError. FIXME: We should really |
| # translate errno using _sys_errlist (or similar), but |
| # how can this be done from Python? |
| raise WindowsError(*e.args) |
| finally: |
| # 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 != -1: |
| p2cread.Close() |
| if c2pwrite != -1: |
| c2pwrite.Close() |
| if errwrite != -1: |
| errwrite.Close() |
| if hasattr(self, '_devnull'): |
| os.close(self._devnull) |
| |
| # Retain the process handle, but close the thread handle |
| self._child_created = True |
| self._handle = hp |
| self.pid = pid |
| ht.Close() |
| |
| def _internal_poll(self, _deadstate=None, |
| _WaitForSingleObject=_subprocess.WaitForSingleObject, |
| _WAIT_OBJECT_0=_subprocess.WAIT_OBJECT_0, |
| _GetExitCodeProcess=_subprocess.GetExitCodeProcess): |
| """Check if child process has terminated. Returns returncode |
| attribute. |
| |
| This method is called by __del__, so it can only refer to objects |
| in its local scope. |
| |
| """ |
| if self.returncode is None: |
| if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0: |
| self.returncode = _GetExitCodeProcess(self._handle) |
| return self.returncode |
| |
| |
| def wait(self, timeout=None, endtime=None): |
| """Wait for child process to terminate. Returns returncode |
| attribute.""" |
| if endtime is not None: |
| timeout = self._remaining_time(endtime) |
| if timeout is None: |
| timeout = _subprocess.INFINITE |
| else: |
| timeout = int(timeout * 1000) |
| if self.returncode is None: |
| result = _subprocess.WaitForSingleObject(self._handle, timeout) |
| if result == _WAIT_TIMEOUT: |
| raise TimeoutExpired(self.args, timeout) |
| self.returncode = _subprocess.GetExitCodeProcess(self._handle) |
| return self.returncode |
| |
| |
| def _readerthread(self, fh, buffer): |
| buffer.append(fh.read()) |
| fh.close() |
| |
| |
| def _communicate(self, input, endtime, orig_timeout): |
| # Start reader threads feeding into a list hanging off of this |
| # object, unless they've already been started. |
| if self.stdout and not hasattr(self, "_stdout_buff"): |
| self._stdout_buff = [] |
| self.stdout_thread = \ |
| threading.Thread(target=self._readerthread, |
| args=(self.stdout, self._stdout_buff)) |
| self.stdout_thread.daemon = True |
| self.stdout_thread.start() |
| if self.stderr and not hasattr(self, "_stderr_buff"): |
| self._stderr_buff = [] |
| self.stderr_thread = \ |
| threading.Thread(target=self._readerthread, |
| args=(self.stderr, self._stderr_buff)) |
| self.stderr_thread.daemon = True |
| self.stderr_thread.start() |
| |
| if self.stdin: |
| if input is not None: |
| self.stdin.write(input) |
| self.stdin.close() |
| |
| # Wait for the reader threads, or time out. If we time out, the |
| # threads remain reading and the fds left open in case the user |
| # calls communicate again. |
| if self.stdout is not None: |
| self.stdout_thread.join(self._remaining_time(endtime)) |
| if self.stdout_thread.isAlive(): |
| raise TimeoutExpired(self.args, orig_timeout) |
| if self.stderr is not None: |
| self.stderr_thread.join(self._remaining_time(endtime)) |
| if self.stderr_thread.isAlive(): |
| raise TimeoutExpired(self.args, orig_timeout) |
| |
| # Collect the output from and close both pipes, now that we know |
| # both have been read successfully. |
| stdout = None |
| stderr = None |
| if self.stdout: |
| stdout = self._stdout_buff |
| self.stdout.close() |
| if self.stderr: |
| stderr = self._stderr_buff |
| self.stderr.close() |
| |
| # All data exchanged. Translate lists into strings. |
| if stdout is not None: |
| stdout = stdout[0] |
| if stderr is not None: |
| stderr = stderr[0] |
| |
| # Translate newlines, if requested. We cannot let the file |
| # object do the translation: It is based on stdio, which is |
| # impossible to combine with select (unless forcing no |
| # buffering). |
| if self.universal_newlines and hasattr(file, 'newlines'): |
| if stdout: |
| stdout = self._translate_newlines(stdout) |
| if stderr: |
| stderr = self._translate_newlines(stderr) |
| |
| return (stdout, stderr) |
| |
| def send_signal(self, sig): |
| """Send a signal to the process.""" |
| # Don't signal a process that we know has already died. |
| if self.returncode is not None: |
| return |
| if sig == signal.SIGTERM: |
| self.terminate() |
| elif sig == signal.CTRL_C_EVENT: |
| os.kill(self.pid, signal.CTRL_C_EVENT) |
| elif sig == signal.CTRL_BREAK_EVENT: |
| os.kill(self.pid, signal.CTRL_BREAK_EVENT) |
| else: |
| raise ValueError("Unsupported signal: %s" % sig) |
| |
| def terminate(self): |
| """Terminates the process.""" |
| # Don't terminate a process that we know has already died. |
| if self.returncode is not None: |
| return |
| _subprocess.TerminateProcess(self._handle, 1) |
| |
| kill = terminate |
| |
| else: |
| # |
| # POSIX methods |
| # |
| def _get_handles(self, stdin, stdout, stderr): |
| """Construct and return tuple with IO objects: |
| p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite |
| """ |
| p2cread, p2cwrite = -1, -1 |
| c2pread, c2pwrite = -1, -1 |
| errread, errwrite = -1, -1 |
| |
| if stdin is None: |
| pass |
| elif stdin == PIPE: |
| p2cread, p2cwrite = _create_pipe() |
| elif stdin == DEVNULL: |
| p2cread = self._get_devnull() |
| elif isinstance(stdin, int): |
| p2cread = stdin |
| else: |
| # Assuming file-like object |
| p2cread = stdin.fileno() |
| |
| if stdout is None: |
| pass |
| elif stdout == PIPE: |
| c2pread, c2pwrite = _create_pipe() |
| elif stdout == DEVNULL: |
| c2pwrite = self._get_devnull() |
| elif isinstance(stdout, int): |
| c2pwrite = stdout |
| else: |
| # Assuming file-like object |
| c2pwrite = stdout.fileno() |
| |
| if stderr is None: |
| pass |
| elif stderr == PIPE: |
| errread, errwrite = _create_pipe() |
| elif stderr == STDOUT: |
| if c2pwrite != -1: |
| errwrite = c2pwrite |
| else: # child's stdout is not set, use parent's stdout |
| errwrite = sys.__stdout__.fileno() |
| elif stderr == DEVNULL: |
| errwrite = self._get_devnull() |
| elif isinstance(stderr, int): |
| errwrite = stderr |
| else: |
| # Assuming file-like object |
| errwrite = stderr.fileno() |
| |
| return (p2cread, p2cwrite, |
| c2pread, c2pwrite, |
| errread, errwrite) |
| |
| |
| if hasattr(os, 'closerange'): # Introduced in 2.6 |
| @staticmethod |
| def _closerange(fd_low, fd_high): |
| os.closerange(fd_low, fd_high) |
| else: |
| @staticmethod |
| def _closerange(fd_low, fd_high): |
| for fd in xrange(fd_low, fd_high): |
| while True: |
| try: |
| os.close(fd) |
| except (OSError, IOError), e: |
| if e.errno == errno.EINTR: |
| continue |
| break |
| |
| |
| def _close_fds(self, but): |
| self._closerange(3, but) |
| self._closerange(but + 1, MAXFD) |
| |
| |
| def _close_all_but_a_sorted_few_fds(self, fds_to_keep): |
| # precondition: fds_to_keep must be sorted and unique |
| start_fd = 3 |
| for fd in fds_to_keep: |
| if fd >= start_fd: |
| self._closerange(start_fd, fd) |
| start_fd = fd + 1 |
| if start_fd <= MAXFD: |
| self._closerange(start_fd, MAXFD) |
| |
| |
| def _execute_child(self, args, executable, preexec_fn, close_fds, |
| pass_fds, cwd, env, universal_newlines, |
| startupinfo, creationflags, shell, |
| p2cread, p2cwrite, |
| c2pread, c2pwrite, |
| errread, errwrite, |
| restore_signals, start_new_session): |
| """Execute program (POSIX version)""" |
| |
| if isinstance(args, types.StringTypes): |
| args = [args] |
| else: |
| args = list(args) |
| |
| if shell: |
| args = ["/bin/sh", "-c"] + args |
| if executable: |
| args[0] = executable |
| |
| if executable is None: |
| executable = args[0] |
| orig_executable = executable |
| |
| # For transferring possible exec failure from child to parent. |
| # Data format: "exception name:hex errno:description" |
| # Pickle is not used; it is complex and involves memory allocation. |
| errpipe_read, errpipe_write = _create_pipe() |
| try: |
| try: |
| |
| if _posixsubprocess: |
| fs_encoding = sys.getfilesystemencoding() |
| def fs_encode(s): |
| """Encode s for use in the env, fs or cmdline.""" |
| if isinstance(s, str): |
| return s |
| else: |
| return s.encode(fs_encoding, 'strict') |
| |
| # We must avoid complex work that could involve |
| # malloc or free in the child process to avoid |
| # potential deadlocks, thus we do all this here. |
| # and pass it to fork_exec() |
| |
| if env is not None: |
| env_list = [fs_encode(k) + '=' + fs_encode(v) |
| for k, v in env.items()] |
| else: |
| env_list = None # Use execv instead of execve. |
| if os.path.dirname(executable): |
| executable_list = (fs_encode(executable),) |
| else: |
| # This matches the behavior of os._execvpe(). |
| path_list = _get_exec_path(env) |
| executable_list = (os.path.join(dir, executable) |
| for dir in path_list) |
| executable_list = tuple(fs_encode(exe) |
| for exe in executable_list) |
| fds_to_keep = set(pass_fds) |
| fds_to_keep.add(errpipe_write) |
| self.pid = _posixsubprocess.fork_exec( |
| args, executable_list, |
| close_fds, sorted(fds_to_keep), cwd, env_list, |
| p2cread, p2cwrite, c2pread, c2pwrite, |
| errread, errwrite, |
| errpipe_read, errpipe_write, |
| restore_signals, start_new_session, preexec_fn) |
| self._child_created = True |
| else: |
| # Pure Python implementation: It is not thread safe. |
| # This implementation may deadlock in the child if your |
| # parent process has any other threads running. |
| |
| gc_was_enabled = gc.isenabled() |
| # Disable gc to avoid bug where gc -> file_dealloc -> |
| # write to stderr -> hang. See issue1336 |
| gc.disable() |
| try: |
| self.pid = os.fork() |
| except: |
| if gc_was_enabled: |
| gc.enable() |
| raise |
| self._child_created = True |
| if self.pid == 0: |
| # Child |
| reached_preexec = False |
| try: |
| # Close parent's pipe ends |
| if p2cwrite != -1: |
| os.close(p2cwrite) |
| if c2pread != -1: |
| os.close(c2pread) |
| if errread != -1: |
| os.close(errread) |
| os.close(errpipe_read) |
| |
| # When duping fds, if there arises a situation |
| # where one of the fds is either 0, 1 or 2, it |
| # is possible that it is overwritten (#12607). |
| if c2pwrite == 0: |
| c2pwrite = os.dup(c2pwrite) |
| if errwrite == 0 or errwrite == 1: |
| errwrite = os.dup(errwrite) |
| |
| # Dup fds for child |
| def _dup2(a, b): |
| # dup2() removes the CLOEXEC flag but |
| # we must do it ourselves if dup2() |
| # would be a no-op (issue #10806). |
| if a == b: |
| _set_cloexec(a, False) |
| elif a != -1: |
| os.dup2(a, b) |
| _dup2(p2cread, 0) |
| _dup2(c2pwrite, 1) |
| _dup2(errwrite, 2) |
| |
| # Close pipe fds. Make sure we don't close the |
| # same fd more than once, or standard fds. |
| closed = set() |
| for fd in [p2cread, c2pwrite, errwrite]: |
| if fd > 2 and fd not in closed: |
| os.close(fd) |
| closed.add(fd) |
| |
| if cwd is not None: |
| os.chdir(cwd) |
| |
| # This is a copy of Python/pythonrun.c |
| # _Py_RestoreSignals(). If that were exposed |
| # as a sys._py_restoresignals func it would be |
| # better.. but this pure python implementation |
| # isn't likely to be used much anymore. |
| if restore_signals: |
| signals = ('SIGPIPE', 'SIGXFZ', 'SIGXFSZ') |
| for sig in signals: |
| if hasattr(signal, sig): |
| signal.signal(getattr(signal, sig), |
| signal.SIG_DFL) |
| |
| if start_new_session and hasattr(os, 'setsid'): |
| os.setsid() |
| |
| reached_preexec = True |
| if preexec_fn: |
| preexec_fn() |
| |
| # Close all other fds, if asked for - after |
| # preexec_fn(), which may open FDs. |
| if close_fds: |
| if pass_fds: |
| fds_to_keep = set(pass_fds) |
| fds_to_keep.add(errpipe_write) |
| self._close_all_but_a_sorted_few_fds( |
| sorted(fds_to_keep)) |
| else: |
| self._close_fds(but=errpipe_write) |
| |
| if env is None: |
| os.execvp(executable, args) |
| else: |
| os.execvpe(executable, args, env) |
| |
| except: |
| try: |
| exc_type, exc_value = sys.exc_info()[:2] |
| if isinstance(exc_value, OSError): |
| errno_num = exc_value.errno |
| else: |
| errno_num = 0 |
| if not reached_preexec: |
| exc_value = "noexec" |
| message = '%s:%x:%s' % (exc_type.__name__, |
| errno_num, exc_value) |
| os.write(errpipe_write, message) |
| except Exception: |
| # We MUST not allow anything odd happening |
| # above to prevent us from exiting below. |
| pass |
| |
| # This exitcode won't be reported to applications |
| # so it really doesn't matter what we return. |
| os._exit(255) |
| |
| # Parent |
| if gc_was_enabled: |
| gc.enable() |
| finally: |
| # be sure the FD is closed no matter what |
| os.close(errpipe_write) |
| |
| # A pair of non -1s means we created both fds and are |
| # responsible for closing them. |
| # self._devnull is not always defined. |
| devnull_fd = getattr(self, '_devnull', None) |
| if p2cread != -1 and p2cwrite != -1 and p2cread != devnull_fd: |
| os.close(p2cread) |
| if c2pwrite != -1 and c2pread != -1 and c2pwrite != devnull_fd: |
| os.close(c2pwrite) |
| if errwrite != -1 and errread != -1 and errwrite != devnull_fd: |
| os.close(errwrite) |
| if devnull_fd is not None: |
| os.close(devnull_fd) |
| # Prevent a double close of these fds from __init__ on error. |
| self._closed_child_pipe_fds = True |
| |
| # Wait for exec to fail or succeed; possibly raising exception |
| # exception (limited in size) |
| errpipe_data = '' |
| while True: |
| part = _eintr_retry_call(os.read, errpipe_read, 50000) |
| errpipe_data += part |
| if not part or len(errpipe_data) > 50000: |
| break |
| finally: |
| # be sure the FD is closed no matter what |
| os.close(errpipe_read) |
| |
| if errpipe_data != "": |
| try: |
| _eintr_retry_call(os.waitpid, self.pid, 0) |
| except OSError, e: |
| if e.errno != errno.ECHILD: |
| raise |
| try: |
| exception_name, hex_errno, err_msg = ( |
| errpipe_data.split(':', 2)) |
| except ValueError: |
| exception_name = 'RuntimeError' |
| hex_errno = '0' |
| err_msg = ('Bad exception data from child: ' + |
| repr(errpipe_data)) |
| child_exception_type = getattr( |
| exceptions, exception_name, RuntimeError) |
| if issubclass(child_exception_type, OSError) and hex_errno: |
| errno_num = int(hex_errno, 16) |
| child_exec_never_called = (err_msg == "noexec") |
| if child_exec_never_called: |
| err_msg = "" |
| if errno_num != 0: |
| err_msg = os.strerror(errno_num) |
| if errno_num == errno.ENOENT: |
| if child_exec_never_called: |
| # The error must be from chdir(cwd). |
| err_msg += ': ' + repr(cwd) |
| else: |
| err_msg += ': ' + repr(orig_executable) |
| raise child_exception_type(errno_num, err_msg) |
| try: |
| exception = child_exception_type(err_msg) |
| except Exception: |
| exception = RuntimeError( |
| 'Could not re-raise %r exception from the' |
| ' child with error message %r' % |
| (child_exception_type, err_msg)) |
| raise exception |
| |
| |
| def _handle_exitstatus(self, sts, _WIFSIGNALED=os.WIFSIGNALED, |
| _WTERMSIG=os.WTERMSIG, _WIFEXITED=os.WIFEXITED, |
| _WEXITSTATUS=os.WEXITSTATUS, _WIFSTOPPED=os.WIFSTOPPED, |
| _WSTOPSIG=os.WSTOPSIG): |
| """All callers to this function MUST hold self._waitpid_lock.""" |
| # This method is called (indirectly) by __del__, so it cannot |
| # refer to anything outside of its local scope.""" |
| if _WIFSIGNALED(sts): |
| self.returncode = -_WTERMSIG(sts) |
| elif _WIFEXITED(sts): |
| self.returncode = _WEXITSTATUS(sts) |
| elif _WIFSTOPPED(sts): |
| self.returncode = -_WSTOPSIG(sts) |
| else: |
| # Should never happen |
| raise RuntimeError("Unknown child exit status!") |
| |
| |
| 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: |
| if not self._waitpid_lock.acquire(False): |
| # Something else is busy calling waitpid. Don't allow two |
| # at once. We know nothing yet. |
| return None |
| try: |
| try: |
| if self.returncode is not None: |
| return self.returncode # Another thread waited. |
| pid, sts = _waitpid(self.pid, _WNOHANG) |
| if pid == self.pid: |
| self._handle_exitstatus(sts) |
| except _os_error, 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 |
| finally: |
| self._waitpid_lock.release() |
| return self.returncode |
| |
| |
| def _try_wait(self, wait_flags): |
| """All callers to this function MUST hold self._waitpid_lock.""" |
| try: |
| (pid, sts) = _eintr_retry_call(os.waitpid, self.pid, wait_flags) |
| except OSError, 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 |
| return (pid, sts) |
| |
| |
| def wait(self, timeout=None, endtime=None): |
| """Wait for child process to terminate. Returns returncode |
| attribute.""" |
| if self.returncode is not None: |
| return self.returncode |
| |
| # endtime is preferred to timeout. timeout is only used for |
| # printing. |
| if endtime is not None or timeout is not None: |
| if endtime is None: |
| endtime = time.time() + timeout |
| elif timeout is None: |
| timeout = self._remaining_time(endtime) |
| |
| if endtime is not None: |
| # Enter a busy loop if we have a timeout. This busy loop was |
| # cribbed from Lib/threading.py in Thread.wait() at r71065. |
| delay = 0.0005 # 500 us -> initial delay of 1 ms |
| while True: |
| if self._waitpid_lock.acquire(False): |
| try: |
| if self.returncode is not None: |
| break # Another thread waited. |
| (pid, sts) = self._try_wait(os.WNOHANG) |
| assert pid == self.pid or pid == 0 |
| if pid == self.pid: |
| self._handle_exitstatus(sts) |
| break |
| finally: |
| self._waitpid_lock.release() |
| remaining = self._remaining_time(endtime) |
| if remaining <= 0: |
| raise TimeoutExpired(self.args, timeout) |
| delay = min(delay * 2, remaining, .05) |
| time.sleep(delay) |
| else: |
| while self.returncode is None: |
| self._waitpid_lock.acquire() |
| try: |
| if self.returncode is not None: |
| break # Another thread waited. |
| (pid, sts) = self._try_wait(0) |
| # Check the pid and loop as waitpid has been known to |
| # return 0 even without WNOHANG in odd situations. |
| # http://bugs.python.org/issue14396. |
| if pid == self.pid: |
| self._handle_exitstatus(sts) |
| finally: |
| self._waitpid_lock.release() |
| return self.returncode |
| |
| |
| def _communicate(self, input, endtime, orig_timeout): |
| if self.stdin and not self._communication_started: |
| # Flush stdio buffer. This might block, if the user has |
| # been writing to .stdin in an uncontrolled fashion. |
| self.stdin.flush() |
| if not input: |
| self.stdin.close() |
| |
| if _has_poll: |
| stdout, stderr = self._communicate_with_poll(input, endtime, |
| orig_timeout) |
| else: |
| stdout, stderr = self._communicate_with_select(input, endtime, |
| orig_timeout) |
| |
| self.wait(timeout=self._remaining_time(endtime)) |
| |
| # All data exchanged. Translate lists into strings. |
| if stdout is not None: |
| stdout = ''.join(stdout) |
| if stderr is not None: |
| stderr = ''.join(stderr) |
| |
| # Translate newlines, if requested. We cannot let the file |
| # object do the translation: It is based on stdio, which is |
| # impossible to combine with select (unless forcing no |
| # buffering). |
| if self.universal_newlines and hasattr(file, 'newlines'): |
| if stdout: |
| stdout = self._translate_newlines(stdout) |
| if stderr: |
| stderr = self._translate_newlines(stderr) |
| |
| return (stdout, stderr) |
| |
| |
| def _communicate_with_poll(self, input, endtime, orig_timeout): |
| stdout = None # Return |
| stderr = None # Return |
| |
| if not self._communication_started: |
| self._fd2file = {} |
| |
| poller = select.poll() |
| def register_and_append(file_obj, eventmask): |
| poller.register(file_obj.fileno(), eventmask) |
| self._fd2file[file_obj.fileno()] = file_obj |
| |
| def close_unregister_and_remove(fd): |
| poller.unregister(fd) |
| self._fd2file[fd].close() |
| self._fd2file.pop(fd) |
| |
| if self.stdin and input: |
| register_and_append(self.stdin, select.POLLOUT) |
| |
| # Only create this mapping if we haven't already. |
| if not self._communication_started: |
| self._fd2output = {} |
| if self.stdout: |
| self._fd2output[self.stdout.fileno()] = [] |
| if self.stderr: |
| self._fd2output[self.stderr.fileno()] = [] |
| |
| select_POLLIN_POLLPRI = select.POLLIN | select.POLLPRI |
| if self.stdout: |
| register_and_append(self.stdout, select_POLLIN_POLLPRI) |
| stdout = self._fd2output[self.stdout.fileno()] |
| if self.stderr: |
| register_and_append(self.stderr, select_POLLIN_POLLPRI) |
| stderr = self._fd2output[self.stderr.fileno()] |
| |
| # Save the input here so that if we time out while communicating, |
| # we can continue sending input if we retry. |
| if self.stdin and self._input is None: |
| self._input_offset = 0 |
| self._input = input |
| if self.universal_newlines and isinstance(self._input, unicode): |
| self._input = self._input.encode( |
| self.stdin.encoding or sys.getdefaultencoding()) |
| |
| while self._fd2file: |
| try: |
| ready = poller.poll(self._remaining_time(endtime)) |
| except select.error, e: |
| if e.args[0] == errno.EINTR: |
| continue |
| raise |
| self._check_timeout(endtime, orig_timeout) |
| |
| for fd, mode in ready: |
| if mode & select.POLLOUT: |
| chunk = self._input[self._input_offset : |
| self._input_offset + _PIPE_BUF] |
| self._input_offset += os.write(fd, chunk) |
| if self._input_offset >= len(self._input): |
| close_unregister_and_remove(fd) |
| elif mode & select_POLLIN_POLLPRI: |
| data = os.read(fd, 4096) |
| if not data: |
| close_unregister_and_remove(fd) |
| self._fd2output[fd].append(data) |
| else: |
| # Ignore hang up or errors. |
| close_unregister_and_remove(fd) |
| |
| return (stdout, stderr) |
| |
| |
| def _communicate_with_select(self, input, endtime, orig_timeout): |
| if not self._communication_started: |
| self._read_set = [] |
| self._write_set = [] |
| if self.stdin and input: |
| self._write_set.append(self.stdin) |
| if self.stdout: |
| self._read_set.append(self.stdout) |
| if self.stderr: |
| self._read_set.append(self.stderr) |
| |
| if self.stdin and self._input is None: |
| self._input_offset = 0 |
| self._input = input |
| if self.universal_newlines and isinstance(self._input, unicode): |
| self._input = self._input.encode( |
| self.stdin.encoding or sys.getdefaultencoding()) |
| |
| stdout = None # Return |
| stderr = None # Return |
| |
| if self.stdout: |
| if not self._communication_started: |
| self._stdout_buff = [] |
| stdout = self._stdout_buff |
| if self.stderr: |
| if not self._communication_started: |
| self._stderr_buff = [] |
| stderr = self._stderr_buff |
| |
| while self._read_set or self._write_set: |
| try: |
| (rlist, wlist, xlist) = \ |
| select.select(self._read_set, self._write_set, [], |
| self._remaining_time(endtime)) |
| except select.error, e: |
| if e.args[0] == errno.EINTR: |
| continue |
| raise |
| |
| # According to the docs, returning three empty lists indicates |
| # that the timeout expired. |
| if not (rlist or wlist or xlist): |
| raise TimeoutExpired(self.args, orig_timeout) |
| # We also check what time it is ourselves for good measure. |
| self._check_timeout(endtime, orig_timeout) |
| |
| if self.stdin in wlist: |
| chunk = self._input[self._input_offset : |
| self._input_offset + _PIPE_BUF] |
| bytes_written = os.write(self.stdin.fileno(), chunk) |
| self._input_offset += bytes_written |
| if self._input_offset >= len(self._input): |
| self.stdin.close() |
| self._write_set.remove(self.stdin) |
| |
| if self.stdout in rlist: |
| data = os.read(self.stdout.fileno(), 1024) |
| if data == "": |
| self.stdout.close() |
| self._read_set.remove(self.stdout) |
| stdout.append(data) |
| |
| if self.stderr in rlist: |
| data = os.read(self.stderr.fileno(), 1024) |
| if data == "": |
| self.stderr.close() |
| self._read_set.remove(self.stderr) |
| stderr.append(data) |
| |
| return (stdout, stderr) |
| |
| |
| def send_signal(self, sig): |
| """Send a signal to the process |
| """ |
| # Skip signalling a process that we know has already died. |
| if self.returncode is None: |
| os.kill(self.pid, sig) |
| |
| def terminate(self): |
| """Terminate the process with SIGTERM |
| """ |
| self.send_signal(signal.SIGTERM) |
| |
| def kill(self): |
| """Kill the process with SIGKILL |
| """ |
| self.send_signal(signal.SIGKILL) |
