"io"
	"os"
	"syscall"
)

const supportsSendfile = true

// sendFile copies the contents of r to c using the TransmitFile
// system call to minimize copies.
//
// if handled == true, sendFile returns the number of bytes copied and any
// non-EOF error.
//
// if handled == false, sendFile performed no work.
func sendFile(fd *netFD, r io.Reader) (written int64, err error, handled bool) {

#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.
int CopyFileContents(int dst_fd, int src_fd, off_t size) {
  off_t offset = 0;

    def "downloads distribution with valid user-agent information"() {
        given:
        server.expect(server.get("/custom-dist.zip").expectUserAgent(matchesNameAndVersion("Gradle Tooling API", GradleVersion.current().getVersion())).sendFile(distribution.binDistribution))

        and:
        toolingApi.withConnector {
            it.useDistribution(URI.create("http://localhost:${server.port}/custom-dist.zip"))
        }

        when:

        given:
        server.expect(server.head("/$TEST_DISTRIBUTION_URL"))
        prepareWrapper(getDefaultBaseUrl())
        server.expect(server.get("/$TEST_DISTRIBUTION_URL").sendFile(distribution.binDistribution))

        when:
        def result = wrapperExecuter.withTasks('hello').run()

        then:
        assertThat(result.output, containsString('hello'))

        when:

        prepareWrapper(getAuthenticatedBaseUrl())
        server.expect(server.get("/$TEST_DISTRIBUTION_URL")
            .expectUserAgent(matchesNameAndVersion("gradlew", Download.UNKNOWN_VERSION))
            .sendFile(distribution.binDistribution))

        when:
        result = wrapperExecuter.withTasks('hello').run()

        then:

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package poll

import (
	"io"
	"syscall"
)

// SendFile wraps the TransmitFile call.
func SendFile(fd *FD, src syscall.Handle, n int64) (written int64, err error) {
	defer func() {
		TestHookDidSendFile(fd, 0, written, err, written > 0)
	}()
	if fd.kind == kindPipe {

	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = uint32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = uint32(length)
}

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	var length = uint64(count)

	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = uint32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = uint32(length)
}

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	var length = uint64(count)

// license that can be found in the LICENSE file.

//go:build !(linux || (darwin && !ios) || dragonfly || freebsd || solaris || windows)

package net

import "io"

const supportsSendfile = false

func sendFile(c *netFD, r io.Reader) (n int64, err error, handled bool) {
	return 0, nil, false

#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`.
//
// This method uses `sendfile` if available (i.e., linux 2.6.33 or later) or an
// intermediate buffer if not.
//
// Returns number of bytes transferred or -1 on failure.
int CopyFileContents(int dst_fd, int src_fd, off_t size);