__init__.py 文件源码

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                if self.logfile is not None:
                    self.logfile.write(data)
                    self.logfile.flush()
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    self.__interact_writen(self.child_fd, data)
                    break
                self.__interact_writen(self.child_fd, data)