code: def _set_nonblock(self, fd):
      flag = fcntl.fcntl(fd, fcntl.F_GETFL)
      fcntl.fcntl(fd, fcntl.F_SETFL, flag | os.O_NONBLOCK)
      new_flag = fcntl.fcntl(fd, fcntl.F_GETFL)
      assert (
          new_flag & os.O_NONBLOCK
      ) != 0, "Cannot set file descriptor {fd} to non-blocking"
  
imports: import fcntl
  import os
  import os.path
  import pathlib
  import select
  import shutil
  import subprocess
  import tarfile
  import time
  import re
  from tvm.micro.project_api import server
label_desc: Use image node_id 7 for calling the Handler obj's underlying member method code with example usage: obj._set_nonblock(fd) without return types