code: # Copyright 2020 The TensorFlow Authors. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # =============================================================================
  """A Python wrapper that loads _pywrap_tensorflow_internal.so."""
  
  import ctypes
  import sys
  import traceback
  
  from tensorflow.python.platform import self_check
  
  # TODO(mdan): Cleanup antipattern: import for side effects.
  
  # Perform pre-load sanity checks in order to produce a more actionable error.
  self_check.preload_check()
  
  # pylint: disable=wildcard-import,g-import-not-at-top,unused-import,line-too-long
  
  try:
    # This import is expected to fail if there is an explicit shared object
    # dependency (with_framework_lib=true), since we do not need RTLD_GLOBAL.
    from tensorflow.python import pywrap_dlopen_global_flags
    _use_dlopen_global_flags = True
  except ImportError:
    _use_dlopen_global_flags = False
  
  # On UNIX-based platforms, pywrap_tensorflow is a python library that
  # dynamically loads _pywrap_tensorflow.so.
  _can_set_rtld_local = (
      hasattr(sys, 'getdlopenflags') and hasattr(sys, 'setdlopenflags'))
  if _can_set_rtld_local:
    _default_dlopen_flags = sys.getdlopenflags()
  
  try:
    if _use_dlopen_global_flags:
      pywrap_dlopen_global_flags.set_dlopen_flags()
    elif _can_set_rtld_local:
      # Ensure RTLD_LOCAL behavior for platforms where it isn't the default
      # (macOS). On Linux RTLD_LOCAL is 0, so this does nothing (and would not
      # override an RTLD_GLOBAL in _default_dlopen_flags).
      sys.setdlopenflags(_default_dlopen_flags | ctypes.RTLD_LOCAL)
  
    # Python2.7 does not have a ModuleNotFoundError.
    try:
      ModuleNotFoundError
    except NameError:
      ModuleNotFoundError = ImportError  # pylint: disable=redefined-builtin
  
    # pylint: disable=wildcard-import,g-import-not-at-top,line-too-long,undefined-variable
    try:
      from tensorflow.python._pywrap_tensorflow_internal import *
    # This try catch logic is because there is no bazel equivalent for py_extension.
    # Externally in opensource we must enable exceptions to load the shared object
    # by exposing the PyInit symbols with pybind. This error will only be
    # caught internally or if someone changes the name of the target _pywrap_tensorflow_internal.
  
    # This logic is used in other internal projects using py_extension.
    except ModuleNotFoundError:
      pass
  
    if _use_dlopen_global_flags:
      pywrap_dlopen_global_flags.reset_dlopen_flags()
    elif _can_set_rtld_local:
      sys.setdlopenflags(_default_dlopen_flags)
  except ImportError:
    raise ImportError(
        f'{traceback.format_exc()}'
        f'\n\nFailed to load the native TensorFlow runtime.\n'
        f'See https://www.tensorflow.org/install/errors '
        f'for some common causes and solutions.\n'
        f'If you need help, create an issue '
        f'at https://github.com/tensorflow/tensorflow/issues '
        f'and include the entire stack trace above this error message.')
  
  # pylint: enable=wildcard-import,g-import-not-at-top,unused-import,line-too-long
  
apis: tensorflow.python.pywrap_dlopen_global_flags.reset_dlopen_flags tensorflow.python.pywrap_dlopen_global_flags.set_dlopen_flags tensorflow.python.platform.self_check.preload_check