code: def exec_command(self, cmd, in_data='', sudoable=True, mitogen_chdir=None):
          
          emulate_tty = (not in_data and sudoable)
          rc, stdout, stderr = self.get_chain().call(
              ansible_mitogen.target.exec_command,
              cmd=mitogen.utils.cast(cmd),
              in_data=mitogen.utils.cast(in_data),
              chdir=mitogen_chdir or self.get_default_cwd(),
              emulate_tty=emulate_tty,
          )
  
          stderr += b'Shared connection to %s closed.%s' % (
              self._play_context.remote_addr.encode(),
              (b'\r\n' if emulate_tty else b'\n'),
          )
          return rc, stdout, stderr
docs: Implement exec_command() by calling the corresponding
          ansible_mitogen.target function in the target.
  
          :param str cmd:
              Shell command to execute.
          :param bytes in_data:
              Data to supply on ``stdin`` of the process.
          :returns:
              (return code, stdout bytes, stderr bytes)