limitations under the License.
==============================================================================*/
#ifndef TENSORFLOW_C_EXPERIMENTAL_FILESYSTEM_PLUGINS_POSIX_COPY_FILE_H_
#define TENSORFLOW_C_EXPERIMENTAL_FILESYSTEM_PLUGINS_POSIX_COPY_FILE_H_

#include <sys/stat.h>

namespace tf_posix_filesystem {

// Transfers up to `size` bytes from `dst_fd` to `src_fd`.
//

==============================================================================*/
#include <limits.h>
#include <stdint.h>
#include <sys/sendfile.h>

#include "tensorflow/c/experimental/filesystem/plugins/posix/copy_file.h"

namespace tf_posix_filesystem {

// Transfers up to `size` bytes from `dst_fd` to `src_fd`.
//
// This method uses `sendfile` specific to linux after 2.6.33.

==============================================================================*/
#include <stdint.h>
#include <unistd.h>

#include <memory>

#include "tensorflow/c/experimental/filesystem/plugins/posix/copy_file.h"

namespace tf_posix_filesystem {

// Transfers up to `size` bytes from `dst_fd` to `src_fd`.
//
// This method uses a temporary buffer to hold contents.
int CopyFileContents(int dst_fd, int src_fd, off_t size) {

    hdrs = ["posix_filesystem_helper.h"],
    deps = [":copy_file"],
)

# On Linux, we can copy files faster using `sendfile`. But not elsewhere.
# Hence, this private library to select which implementation to use.
cc_library(
    name = "copy_file",
    srcs = select({
        "//tensorflow:linux_x86_64": ["copy_file_linux.cc"],
        "//conditions:default": ["copy_file_portable.cc"],
    }),
    hdrs = ["copy_file.h"],

  return StatusFromTF_Status(plugin_status.get());
}

Status ModularFileSystem::CopyFile(const std::string& src,
                                   const std::string& target,
                                   TransactionToken* token) {
  if (ops_->copy_file == nullptr)
    return FileSystem::CopyFile(src, target, token);

  UniquePtrTo_TF_Status plugin_status(TF_NewStatus(), TF_DeleteStatus);

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tensorflow/c/experimental/filesystem/plugins/posix/copy_file.h"

namespace tf_posix_filesystem {

int TransferFileContents(const char* src, const char* dst, mode_t mode,
                         off_t size) {
  int src_fd = open(src, O_RDONLY);
  if (src_fd < 0) return -1;

  ops->filesystem_ops->delete_dir = tf_posix_filesystem::DeleteDir;
  ops->filesystem_ops->rename_file = tf_posix_filesystem::RenameFile;
  ops->filesystem_ops->copy_file = tf_posix_filesystem::CopyFile;
  ops->filesystem_ops->path_exists = tf_posix_filesystem::PathExists;
  ops->filesystem_ops->stat = tf_posix_filesystem::Stat;
  ops->filesystem_ops->get_children = tf_posix_filesystem::GetChildren;
}

# load("@rules_license//rules:license.bzl", "license")
# # buildifier: enable=out-of-order-load
# copybara:uncomment_end

# copybara:comment_begin(oss-only)
load("@bazel_skylib//rules:copy_file.bzl", "copy_file")
load(
    "//tensorflow/python/tools/api/generator:api_gen.bzl",
    "get_compat_files",
    "get_nested_compat_files",
)
load(
    "//tensorflow/python/tools/api/generator:api_init_files.bzl",

  ops->filesystem_ops->delete_dir = tf_gcs_filesystem::DeleteDir;
  ops->filesystem_ops->delete_recursively =
      tf_gcs_filesystem::DeleteRecursively;
  ops->filesystem_ops->copy_file = tf_gcs_filesystem::CopyFile;
  ops->filesystem_ops->path_exists = tf_gcs_filesystem::PathExists;
  ops->filesystem_ops->is_directory = tf_gcs_filesystem::IsDirectory;
  ops->filesystem_ops->stat = tf_gcs_filesystem::Stat;

    GTEST_SKIP() << "NewWritableFile() not supported: " << status;

  const std::string new_filepath = GetURIForPath("a_new_file");
  status = env_->CopyFile(filepath, new_filepath);
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
  if (!status.ok()) GTEST_SKIP() << "CopyFile() not supported: " << status;

  status = env_->FileExists(filepath);
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);