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, 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]

            # 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 = self.pipe_cloexec()
            try:
                try:
                    gc_was_enabled = gc.isenabled()
                    # Disable gc to avoid bug where gc -> file_dealloc ->
                    # write to stderr -> hang.  http://bugs.python.org/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
                        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)

                            # 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:
                                    self._set_cloexec_flag(a, False)
                                elif a is not None:
                                    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([None])
                            for fd in [p2cread, c2pwrite, errwrite]:
                                if closed not in fd and fd > 2:
                                    os.close(fd)
                                    closed.add(fd)

                            # 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
                    if gc_was_enabled:
                        gc.enable()
                finally:
                    # be sure the FD is closed no matter what
                    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
                # Exception limited to 1M
                data = _eintr_retry_call(os.read, errpipe_read, 1048576)
            finally:
                # be sure the FD is closed no matter what
                os.close(errpipe_read)

            if data != "":
                try:
                    _eintr_retry_call(os.waitpid, self.pid, 0)
                except OSError as e:
                    if e.errno != errno.ECHILD:
                        raise
                child_exception = pickle.loads(data)
                for fd in (p2cwrite, c2pread, errread):
                    if fd is not None:
                        os.close(fd)
                raise child_exception
dataset/ETHPy150Open clips/pattern/pattern/server/cherrypy/cherrypy/_cpcompat_subprocess.py/Popen._execute_child/swapped operands of `not in`