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lib64/python3.8/distutils/spawn.py 0000644 00000017243 15204173037 0012775 0 ustar 00 """distutils.spawn Provides the 'spawn()' function, a front-end to various platform- specific functions for launching another program in a sub-process. Also provides the 'find_executable()' to search the path for a given executable name. """ import sys import os from distutils.errors import DistutilsPlatformError, DistutilsExecError from distutils.debug import DEBUG from distutils import log def spawn(cmd, search_path=1, verbose=0, dry_run=0): """Run another program, specified as a command list 'cmd', in a new process. 'cmd' is just the argument list for the new process, ie. cmd[0] is the program to run and cmd[1:] are the rest of its arguments. There is no way to run a program with a name different from that of its executable. If 'search_path' is true (the default), the system's executable search path will be used to find the program; otherwise, cmd[0] must be the exact path to the executable. If 'dry_run' is true, the command will not actually be run. Raise DistutilsExecError if running the program fails in any way; just return on success. """ # cmd is documented as a list, but just in case some code passes a tuple # in, protect our %-formatting code against horrible death cmd = list(cmd) if os.name == 'posix': _spawn_posix(cmd, search_path, dry_run=dry_run) elif os.name == 'nt': _spawn_nt(cmd, search_path, dry_run=dry_run) else: raise DistutilsPlatformError( "don't know how to spawn programs on platform '%s'" % os.name) def _nt_quote_args(args): """Quote command-line arguments for DOS/Windows conventions. Just wraps every argument which contains blanks in double quotes, and returns a new argument list. """ # XXX this doesn't seem very robust to me -- but if the Windows guys # say it'll work, I guess I'll have to accept it. (What if an arg # contains quotes? What other magic characters, other than spaces, # have to be escaped? Is there an escaping mechanism other than # quoting?) for i, arg in enumerate(args): if ' ' in arg: args[i] = '"%s"' % arg return args def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0): executable = cmd[0] cmd = _nt_quote_args(cmd) if search_path: # either we find one or it stays the same executable = find_executable(executable) or executable log.info(' '.join([executable] + cmd[1:])) if not dry_run: # spawn for NT requires a full path to the .exe try: rc = os.spawnv(os.P_WAIT, executable, cmd) except OSError as exc: # this seems to happen when the command isn't found if not DEBUG: cmd = executable raise DistutilsExecError( "command %r failed: %s" % (cmd, exc.args[-1])) if rc != 0: # and this reflects the command running but failing if not DEBUG: cmd = executable raise DistutilsExecError( "command %r failed with exit status %d" % (cmd, rc)) if sys.platform == 'darwin': _cfg_target = None _cfg_target_split = None def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0): log.info(' '.join(cmd)) if dry_run: return executable = cmd[0] exec_fn = search_path and os.execvp or os.execv env = None if sys.platform == 'darwin': global _cfg_target, _cfg_target_split if _cfg_target is None: from distutils import sysconfig _cfg_target = sysconfig.get_config_var( 'MACOSX_DEPLOYMENT_TARGET') or '' if _cfg_target: _cfg_target_split = [int(x) for x in _cfg_target.split('.')] if _cfg_target: # ensure that the deployment target of build process is not less # than that used when the interpreter was built. This ensures # extension modules are built with correct compatibility values cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target) if _cfg_target_split > [int(x) for x in cur_target.split('.')]: my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: ' 'now "%s" but "%s" during configure' % (cur_target, _cfg_target)) raise DistutilsPlatformError(my_msg) env = dict(os.environ, MACOSX_DEPLOYMENT_TARGET=cur_target) exec_fn = search_path and os.execvpe or os.execve pid = os.fork() if pid == 0: # in the child try: if env is None: exec_fn(executable, cmd) else: exec_fn(executable, cmd, env) except OSError as e: if not DEBUG: cmd = executable sys.stderr.write("unable to execute %r: %s\n" % (cmd, e.strerror)) os._exit(1) if not DEBUG: cmd = executable sys.stderr.write("unable to execute %r for unknown reasons" % cmd) os._exit(1) else: # in the parent # Loop until the child either exits or is terminated by a signal # (ie. keep waiting if it's merely stopped) while True: try: pid, status = os.waitpid(pid, 0) except OSError as exc: if not DEBUG: cmd = executable raise DistutilsExecError( "command %r failed: %s" % (cmd, exc.args[-1])) if os.WIFSIGNALED(status): if not DEBUG: cmd = executable raise DistutilsExecError( "command %r terminated by signal %d" % (cmd, os.WTERMSIG(status))) elif os.WIFEXITED(status): exit_status = os.WEXITSTATUS(status) if exit_status == 0: return # hey, it succeeded! else: if not DEBUG: cmd = executable raise DistutilsExecError( "command %r failed with exit status %d" % (cmd, exit_status)) elif os.WIFSTOPPED(status): continue else: if not DEBUG: cmd = executable raise DistutilsExecError( "unknown error executing %r: termination status %d" % (cmd, status)) def find_executable(executable, path=None): """Tries to find 'executable' in the directories listed in 'path'. A string listing directories separated by 'os.pathsep'; defaults to os.environ['PATH']. Returns the complete filename or None if not found. """ _, ext = os.path.splitext(executable) if (sys.platform == 'win32') and (ext != '.exe'): executable = executable + '.exe' if os.path.isfile(executable): return executable if path is None: path = os.environ.get('PATH', None) if path is None: try: path = os.confstr("CS_PATH") except (AttributeError, ValueError): # os.confstr() or CS_PATH is not available path = os.defpath # bpo-35755: Don't use os.defpath if the PATH environment variable is # set to an empty string # PATH='' doesn't match, whereas PATH=':' looks in the current directory if not path: return None paths = path.split(os.pathsep) for p in paths: f = os.path.join(p, executable) if os.path.isfile(f): # the file exists, we have a shot at spawn working return f return None lib64/python3.8/multiprocessing/spawn.py 0000644 00000022120 15204253364 0014170 0 ustar 00 # # Code used to start processes when using the spawn or forkserver # start methods. # # multiprocessing/spawn.py # # Copyright (c) 2006-2008, R Oudkerk # Licensed to PSF under a Contributor Agreement. # import os import sys import runpy import types from . import get_start_method, set_start_method from . import process from .context import reduction from . import util __all__ = ['_main', 'freeze_support', 'set_executable', 'get_executable', 'get_preparation_data', 'get_command_line', 'import_main_path'] # # _python_exe is the assumed path to the python executable. # People embedding Python want to modify it. # if sys.platform != 'win32': WINEXE = False WINSERVICE = False else: WINEXE = getattr(sys, 'frozen', False) WINSERVICE = sys.executable.lower().endswith("pythonservice.exe") if WINSERVICE: _python_exe = os.path.join(sys.exec_prefix, 'python.exe') else: _python_exe = sys.executable def set_executable(exe): global _python_exe _python_exe = exe def get_executable(): return _python_exe # # # def is_forking(argv): ''' Return whether commandline indicates we are forking ''' if len(argv) >= 2 and argv[1] == '--multiprocessing-fork': return True else: return False def freeze_support(): ''' Run code for process object if this in not the main process ''' if is_forking(sys.argv): kwds = {} for arg in sys.argv[2:]: name, value = arg.split('=') if value == 'None': kwds[name] = None else: kwds[name] = int(value) spawn_main(**kwds) sys.exit() def get_command_line(**kwds): ''' Returns prefix of command line used for spawning a child process ''' if getattr(sys, 'frozen', False): return ([sys.executable, '--multiprocessing-fork'] + ['%s=%r' % item for item in kwds.items()]) else: prog = 'from multiprocessing.spawn import spawn_main; spawn_main(%s)' prog %= ', '.join('%s=%r' % item for item in kwds.items()) opts = util._args_from_interpreter_flags() return [_python_exe] + opts + ['-c', prog, '--multiprocessing-fork'] def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None): ''' Run code specified by data received over pipe ''' assert is_forking(sys.argv), "Not forking" if sys.platform == 'win32': import msvcrt import _winapi if parent_pid is not None: source_process = _winapi.OpenProcess( _winapi.SYNCHRONIZE | _winapi.PROCESS_DUP_HANDLE, False, parent_pid) else: source_process = None new_handle = reduction.duplicate(pipe_handle, source_process=source_process) fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY) parent_sentinel = source_process else: from . import resource_tracker resource_tracker._resource_tracker._fd = tracker_fd fd = pipe_handle parent_sentinel = os.dup(pipe_handle) exitcode = _main(fd, parent_sentinel) sys.exit(exitcode) def _main(fd, parent_sentinel): with os.fdopen(fd, 'rb', closefd=True) as from_parent: process.current_process()._inheriting = True try: preparation_data = reduction.pickle.load(from_parent) prepare(preparation_data) self = reduction.pickle.load(from_parent) finally: del process.current_process()._inheriting return self._bootstrap(parent_sentinel) def _check_not_importing_main(): if getattr(process.current_process(), '_inheriting', False): raise RuntimeError(''' An attempt has been made to start a new process before the current process has finished its bootstrapping phase. This probably means that you are not using fork to start your child processes and you have forgotten to use the proper idiom in the main module: if __name__ == '__main__': freeze_support() ... The "freeze_support()" line can be omitted if the program is not going to be frozen to produce an executable.''') def get_preparation_data(name): ''' Return info about parent needed by child to unpickle process object ''' _check_not_importing_main() d = dict( log_to_stderr=util._log_to_stderr, authkey=process.current_process().authkey, ) if util._logger is not None: d['log_level'] = util._logger.getEffectiveLevel() sys_path=sys.path.copy() try: i = sys_path.index('') except ValueError: pass else: sys_path[i] = process.ORIGINAL_DIR d.update( name=name, sys_path=sys_path, sys_argv=sys.argv, orig_dir=process.ORIGINAL_DIR, dir=os.getcwd(), start_method=get_start_method(), ) # Figure out whether to initialise main in the subprocess as a module # or through direct execution (or to leave it alone entirely) main_module = sys.modules['__main__'] main_mod_name = getattr(main_module.__spec__, "name", None) if main_mod_name is not None: d['init_main_from_name'] = main_mod_name elif sys.platform != 'win32' or (not WINEXE and not WINSERVICE): main_path = getattr(main_module, '__file__', None) if main_path is not None: if (not os.path.isabs(main_path) and process.ORIGINAL_DIR is not None): main_path = os.path.join(process.ORIGINAL_DIR, main_path) d['init_main_from_path'] = os.path.normpath(main_path) return d # # Prepare current process # old_main_modules = [] def prepare(data): ''' Try to get current process ready to unpickle process object ''' if 'name' in data: process.current_process().name = data['name'] if 'authkey' in data: process.current_process().authkey = data['authkey'] if 'log_to_stderr' in data and data['log_to_stderr']: util.log_to_stderr() if 'log_level' in data: util.get_logger().setLevel(data['log_level']) if 'sys_path' in data: sys.path = data['sys_path'] if 'sys_argv' in data: sys.argv = data['sys_argv'] if 'dir' in data: os.chdir(data['dir']) if 'orig_dir' in data: process.ORIGINAL_DIR = data['orig_dir'] if 'start_method' in data: set_start_method(data['start_method'], force=True) if 'init_main_from_name' in data: _fixup_main_from_name(data['init_main_from_name']) elif 'init_main_from_path' in data: _fixup_main_from_path(data['init_main_from_path']) # Multiprocessing module helpers to fix up the main module in # spawned subprocesses def _fixup_main_from_name(mod_name): # __main__.py files for packages, directories, zip archives, etc, run # their "main only" code unconditionally, so we don't even try to # populate anything in __main__, nor do we make any changes to # __main__ attributes current_main = sys.modules['__main__'] if mod_name == "__main__" or mod_name.endswith(".__main__"): return # If this process was forked, __main__ may already be populated if getattr(current_main.__spec__, "name", None) == mod_name: return # Otherwise, __main__ may contain some non-main code where we need to # support unpickling it properly. We rerun it as __mp_main__ and make # the normal __main__ an alias to that old_main_modules.append(current_main) main_module = types.ModuleType("__mp_main__") main_content = runpy.run_module(mod_name, run_name="__mp_main__", alter_sys=True) main_module.__dict__.update(main_content) sys.modules['__main__'] = sys.modules['__mp_main__'] = main_module def _fixup_main_from_path(main_path): # If this process was forked, __main__ may already be populated current_main = sys.modules['__main__'] # Unfortunately, the main ipython launch script historically had no # "if __name__ == '__main__'" guard, so we work around that # by treating it like a __main__.py file # See https://github.com/ipython/ipython/issues/4698 main_name = os.path.splitext(os.path.basename(main_path))[0] if main_name == 'ipython': return # Otherwise, if __file__ already has the setting we expect, # there's nothing more to do if getattr(current_main, '__file__', None) == main_path: return # If the parent process has sent a path through rather than a module # name we assume it is an executable script that may contain # non-main code that needs to be executed old_main_modules.append(current_main) main_module = types.ModuleType("__mp_main__") main_content = runpy.run_path(main_path, run_name="__mp_main__") main_module.__dict__.update(main_content) sys.modules['__main__'] = sys.modules['__mp_main__'] = main_module def import_main_path(main_path): ''' Set sys.modules['__main__'] to module at main_path ''' _fixup_main_from_path(main_path)
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