// Step 2: Initialize the opaque filesystem structure
  auto filesystem = std::make_unique<TF_Filesystem>();
  TF_Status* c_status = TF_NewStatus();
  Status status = OkStatus();
  core_filesystem_ops->init(filesystem.get(), c_status);
  status = Status(c_status->status);
  TF_DeleteStatus(c_status);
  if (!status.ok()) return status;

  // Step 3: Actual registration
  return Env::Default()->RegisterFileSystem(

                                                TF_Status* status);

TF_CAPI_EXPORT extern void TF_AllocateTempForVariableInfo(
    TF_OpKernelContext* ctx, TF_VariableInfo* var_info, TF_Status* status);

TF_CAPI_EXPORT extern TF_Tensor* TF_GetTensorFromVariableInfo(
    TF_VariableInfo* var_info, TF_Status* status);

TF_CAPI_EXPORT extern void TF_DeleteVariableInfo(TF_VariableInfo* var_info);

                            TF_Status* s);
// `op_name` must outlive `op`.
void TF_AbstractOpSetOpName(TF_AbstractOp* op, const char* const op_name,
                            TF_Status* s);
// `attr_name` must outlive `op`.
void TF_AbstractOpSetAttrType(TF_AbstractOp* op, const char* const attr_name,
                              TF_DataType value, TF_Status* s);

void TF_DeleteAbstractTensor(TF_AbstractTensor*);

                   TF_Status* status) {
  auto posix_file = static_cast<PosixFile*>(file->plugin_file);

  size_t r = fwrite(buffer, 1, n, posix_file->handle);
  if (r != n)
    TF_SetStatusFromIOError(status, errno, posix_file->filename);
  else
    TF_SetStatus(status, TF_OK, "");
}

static int64_t Tell(const TF_WritableFile* file, TF_Status* status) {

    int num_dims, TF_StringView* var_name,
    void (*plugin_allocator)(TF_OpKernelContext*, TF_Tensor*, TF_DataType,
                             const int64_t*, int, TF_Status*),
    TF_Status* tf_status);

// Expose higher level temporary variable operator for Pluggable vendors to
// implement in the plugin for destroying temporary variables. The API takes in

TF_CAPI_EXPORT extern void TF_CreateDir(const char* dirname, TF_Status* status);

// Deletes the specified directory. Typical status codes are:
//  * TF_OK - successfully deleted the directory
//  * TF_FAILED_PRECONDITION - the directory is not empty
TF_CAPI_EXPORT extern void TF_DeleteDir(const char* dirname, TF_Status* status);

// Deletes the specified directory and all subdirectories and files underneath

        std::string value_str(value);
        TF_SetPayload(tf_status, key_str.c_str(), value_str.c_str());
      });
}

absl::Status StatusFromTF_Status(const TF_Status* tf_status) {
  absl::Status status(StatusCodeFromTSLCode(TF_GetCode(tf_status)),
                      TF_Message(tf_status));
  TF_ForEachPayload(
      tf_status,
      [](const char* key, const char* value, void* capture) {

                                                 TF_Status* s) {
  TFE_Context* c_ctx = TFE_NewContext(options, s);
  if (TF_GetCode(s) != TF_OK) {
    return nullptr;
  }
  return wrap(static_cast<AbstractContext*>(unwrap(c_ctx)));
}

TF_AbstractTensor* TF_CreateAbstractTensorFromEagerTensor(TFE_TensorHandle* t,
                                                          TF_Status* s) {

void Append(const TF_WritableFile* file, const char* buffer, size_t n,
            TF_Status* status);
int64_t Tell(const TF_WritableFile* file, TF_Status* status);
void Flush(const TF_WritableFile* file, TF_Status* status);
void Sync(const TF_WritableFile* file, TF_Status* status);
void Close(const TF_WritableFile* file, TF_Status* status);
}  // namespace tf_writable_file

namespace tf_read_only_memory_region {

Safe_TFE_TensorHandlePtr make_safe(TFE_TensorHandle* handle);

// Safe containers for an owned TF_Status. On destruction, the handle
// will be deleted by TF_DeleteStatus.
using Safe_TF_StatusPtr = std::unique_ptr<TF_Status, detail::TFStatusDeleter>;
Safe_TF_StatusPtr make_safe(TF_Status* status);

// Safe containers for an owned TF_Buffer. On destruction, the handle
// will be deleted by TF_DeleteBuffer.