OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	12/01/2022 06:13:58 PM	rwxr-xr-x
📄 addrselect.go	9.44 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 addrselect_test.go	6.22 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_aix.go	582 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_android.go	272 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_bsd.go	353 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_linux.go	642 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_netbsd.go	276 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_openbsd.go	276 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_resnew.go	590 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_resold.go	579 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_socknew.go	753 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_sockold.go	852 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_solaris.go	343 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_stub.go	1.03 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_unix.go	9.49 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_unix_test.go	1.84 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 cgo_windows.go	402 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 conf.go	9.65 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 conf_netcgo.go	370 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 conf_test.go	9.7 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 conn_test.go	1.73 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dial.go	22.73 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dial_test.go	26.1 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dial_unix_test.go	2.77 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsclient.go	5.57 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsclient_test.go	1.51 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsclient_unix.go	22.72 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsclient_unix_test.go	57.08 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsconfig.go	1.61 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsconfig_unix.go	4.01 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsconfig_unix_test.go	6.69 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsconfig_windows.go	1.42 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 dnsname_test.go	1.98 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_plan9.go	224 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_plan9_test.go	476 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_posix.go	542 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_posix_test.go	981 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_test.go	19.72 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_unix.go	372 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_unix_test.go	762 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_windows.go	355 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 error_windows_test.go	796 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 example_test.go	8.45 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 external_test.go	4.07 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 fcntl_libc_test.go	374 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 fcntl_syscall_test.go	496 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 fd_plan9.go	3.56 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 fd_posix.go	4.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 fd_unix.go	5.37 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 fd_windows.go	4.62 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 file.go	1.69 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 file_plan9.go	2.68 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 file_stub.go	489 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 file_test.go	6.38 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 file_unix.go	2.46 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 file_windows.go	521 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 hook.go	628 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 hook_plan9.go	283 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 hook_unix.go	690 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 hook_windows.go	875 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 hosts.go	3.02 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 hosts_test.go	4.58 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 http	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 interface.go	7.17 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_aix.go	4.4 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_bsd.go	2.76 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_bsd_test.go	1.44 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_bsdvar.go	718 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_darwin.go	1.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_freebsd.go	1.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_linux.go	6.9 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_linux_test.go	3.65 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_plan9.go	4.68 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_solaris.go	2.07 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_stub.go	812 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_test.go	9.67 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_unix_test.go	4.73 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 interface_windows.go	5.41 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 internal	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 ip.go	17.72 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 ip_test.go	25.33 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 iprawsock.go	7.08 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 iprawsock_plan9.go	874 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 iprawsock_posix.go	3.41 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 iprawsock_test.go	5.62 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 ipsock.go	8.97 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 ipsock_plan9.go	7.5 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 ipsock_plan9_test.go	645 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 ipsock_posix.go	7.66 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 ipsock_test.go	6.81 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 listen_test.go	20.51 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup.go	27.82 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_fake.go	1.64 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_plan9.go	8.86 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_test.go	35.13 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_unix.go	4.46 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_windows.go	12.53 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 lookup_windows_test.go	8.5 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 mac.go	1.88 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 mac_test.go	3.26 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 mail	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 main_cloexec_test.go	693 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_conf_test.go	922 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_noconf_test.go	505 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_plan9_test.go	392 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_posix_test.go	1.38 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_test.go	7.08 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_unix_test.go	1.19 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 main_windows_test.go	1.08 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 mockserver_test.go	10.79 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 net.go	23.25 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 net_fake.go	6.59 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 net_test.go	13.88 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 net_windows_test.go	16.28 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 netgo.go	427 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 netgo_unix_test.go	656 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📁 netip	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 nss.go	3.64 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 nss_test.go	3.35 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 packetconn_test.go	3.03 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 parse.go	7.06 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 parse_test.go	1.46 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 pipe.go	5.43 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 pipe_test.go	1.2 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 platform_test.go	4.57 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 port.go	1.46 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 port_test.go	1.34 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 port_unix.go	1.24 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 protoconn_test.go	7.19 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 rawconn.go	1.89 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 rawconn_stub_test.go	631 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 rawconn_test.go	4.32 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 rawconn_unix_test.go	2.96 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 rawconn_windows_test.go	3.12 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 resolverdialfunc_test.go	8.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 rpc	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 sendfile_linux.go	1.1 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sendfile_stub.go	344 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sendfile_test.go	6.72 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sendfile_unix_alt.go	2.01 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sendfile_windows.go	1.02 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 server_test.go	11.01 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 smtp	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 sock_bsd.go	918 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_cloexec.go	741 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_linux.go	1.53 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_linux_test.go	545 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_plan9.go	262 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_posix.go	6.78 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_stub.go	390 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sock_windows.go	1.16 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockaddr_posix.go	914 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_aix.go	1.43 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_bsd.go	2.21 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_linux.go	1.25 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_plan9.go	406 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_posix.go	2.62 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_solaris.go	1.25 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_stub.go	742 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockopt_windows.go	1.51 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockoptip_bsdvar.go	867 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockoptip_linux.go	735 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockoptip_posix.go	1.38 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockoptip_stub.go	767 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 sockoptip_windows.go	819 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 splice_linux.go	1.09 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 splice_stub.go	287 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 splice_test.go	10.05 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 sys_cloexec.go	962 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsock.go	10.61 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsock_plan9.go	2.21 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsock_posix.go	5.31 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsock_test.go	17.32 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsock_unix_test.go	2.35 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_darwin.go	770 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_dragonfly.go	698 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_openbsd.go	365 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_plan9.go	525 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_posix.go	442 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_solaris.go	1.15 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_stub.go	397 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_unix.go	722 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 tcpsockopt_windows.go	741 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📁 testdata	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📁 textproto	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 timeout_test.go	28.56 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 udpsock.go	11.83 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 udpsock_plan9.go	4.64 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 udpsock_plan9_test.go	1.31 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 udpsock_posix.go	6.78 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 udpsock_test.go	16.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock.go	10.17 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_linux_test.go	2.29 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_plan9.go	1.24 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_posix.go	5.87 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_readmsg_cloexec.go	654 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_readmsg_cmsg_cloexec.go	332 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_readmsg_other.go	275 bytes	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_readmsg_test.go	2.48 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_test.go	10.42 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 unixsock_windows_test.go	2.03 KB	12/01/2022 06:12:59 PM	rw-r--r--
📁 url	-	12/01/2022 06:13:56 PM	rwxr-xr-x
📄 write_unix_test.go	1.61 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 writev_test.go	4.97 KB	12/01/2022 06:12:59 PM	rw-r--r--
📄 writev_unix.go	733 bytes	12/01/2022 06:12:59 PM	rw-r--r--

Editing: sendfile_test.go

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !js

package net

import (
	"bytes"
	"crypto/sha256"
	"encoding/hex"
	"errors"
	"fmt"
	"io"
	"os"
	"runtime"
	"sync"
	"testing"
	"time"
)

const (
	newton       = "../testdata/Isaac.Newton-Opticks.txt"
	newtonLen    = 567198
	newtonSHA256 = "d4a9ac22462b35e7821a4f2706c211093da678620a8f9997989ee7cf8d507bbd"
)

func TestSendfile(t *testing.T) {
	ln := newLocalListener(t, "tcp")
	defer ln.Close()

errc := make(chan error, 1)
	go func(ln Listener) {
		// Wait for a connection.
		conn, err := ln.Accept()
		if err != nil {
			errc <- err
			close(errc)
			return
		}

go func() {
			defer close(errc)
			defer conn.Close()

f, err := os.Open(newton)
			if err != nil {
				errc <- err
				return
			}
			defer f.Close()

// Return file data using io.Copy, which should use
			// sendFile if available.
			sbytes, err := io.Copy(conn, f)
			if err != nil {
				errc <- err
				return
			}

if sbytes != newtonLen {
				errc <- fmt.Errorf("sent %d bytes; expected %d", sbytes, newtonLen)
				return
			}
		}()
	}(ln)

// Connect to listener to retrieve file and verify digest matches
	// expected.
	c, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer c.Close()

h := sha256.New()
	rbytes, err := io.Copy(h, c)
	if err != nil {
		t.Error(err)
	}

if rbytes != newtonLen {
		t.Errorf("received %d bytes; expected %d", rbytes, newtonLen)
	}

if res := hex.EncodeToString(h.Sum(nil)); res != newtonSHA256 {
		t.Error("retrieved data hash did not match")
	}

for err := range errc {
		t.Error(err)
	}
}

func TestSendfileParts(t *testing.T) {
	ln := newLocalListener(t, "tcp")
	defer ln.Close()

errc := make(chan error, 1)
	go func(ln Listener) {
		// Wait for a connection.
		conn, err := ln.Accept()
		if err != nil {
			errc <- err
			close(errc)
			return
		}

go func() {
			defer close(errc)
			defer conn.Close()

f, err := os.Open(newton)
			if err != nil {
				errc <- err
				return
			}
			defer f.Close()

for i := 0; i < 3; i++ {
				// Return file data using io.CopyN, which should use
				// sendFile if available.
				_, err = io.CopyN(conn, f, 3)
				if err != nil {
					errc <- err
					return
				}
			}
		}()
	}(ln)

c, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer c.Close()

buf := new(bytes.Buffer)
	buf.ReadFrom(c)

if want, have := "Produced ", buf.String(); have != want {
		t.Errorf("unexpected server reply %q, want %q", have, want)
	}

for err := range errc {
		t.Error(err)
	}
}

func TestSendfileSeeked(t *testing.T) {
	ln := newLocalListener(t, "tcp")
	defer ln.Close()

const seekTo = 65 << 10
	const sendSize = 10 << 10

errc := make(chan error, 1)
	go func(ln Listener) {
		// Wait for a connection.
		conn, err := ln.Accept()
		if err != nil {
			errc <- err
			close(errc)
			return
		}

go func() {
			defer close(errc)
			defer conn.Close()

f, err := os.Open(newton)
			if err != nil {
				errc <- err
				return
			}
			defer f.Close()
			if _, err := f.Seek(seekTo, os.SEEK_SET); err != nil {
				errc <- err
				return
			}

_, err = io.CopyN(conn, f, sendSize)
			if err != nil {
				errc <- err
				return
			}
		}()
	}(ln)

c, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer c.Close()

buf := new(bytes.Buffer)
	buf.ReadFrom(c)

if buf.Len() != sendSize {
		t.Errorf("Got %d bytes; want %d", buf.Len(), sendSize)
	}

for err := range errc {
		t.Error(err)
	}
}

// Test that sendfile doesn't put a pipe into blocking mode.
func TestSendfilePipe(t *testing.T) {
	switch runtime.GOOS {
	case "plan9", "windows":
		// These systems don't support deadlines on pipes.
		t.Skipf("skipping on %s", runtime.GOOS)
	}

t.Parallel()

ln := newLocalListener(t, "tcp")
	defer ln.Close()

r, w, err := os.Pipe()
	if err != nil {
		t.Fatal(err)
	}
	defer w.Close()
	defer r.Close()

copied := make(chan bool)

var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		// Accept a connection and copy 1 byte from the read end of
		// the pipe to the connection. This will call into sendfile.
		defer wg.Done()
		conn, err := ln.Accept()
		if err != nil {
			t.Error(err)
			return
		}
		defer conn.Close()
		_, err = io.CopyN(conn, r, 1)
		if err != nil {
			t.Error(err)
			return
		}
		// Signal the main goroutine that we've copied the byte.
		close(copied)
	}()

wg.Add(1)
	go func() {
		// Write 1 byte to the write end of the pipe.
		defer wg.Done()
		_, err := w.Write([]byte{'a'})
		if err != nil {
			t.Error(err)
		}
	}()

wg.Add(1)
	go func() {
		// Connect to the server started two goroutines up and
		// discard any data that it writes.
		defer wg.Done()
		conn, err := Dial("tcp", ln.Addr().String())
		if err != nil {
			t.Error(err)
			return
		}
		defer conn.Close()
		io.Copy(io.Discard, conn)
	}()

// Wait for the byte to be copied, meaning that sendfile has
	// been called on the pipe.
	<-copied

// Set a very short deadline on the read end of the pipe.
	if err := r.SetDeadline(time.Now().Add(time.Microsecond)); err != nil {
		t.Fatal(err)
	}

wg.Add(1)
	go func() {
		// Wait for much longer than the deadline and write a byte
		// to the pipe.
		defer wg.Done()
		time.Sleep(50 * time.Millisecond)
		w.Write([]byte{'b'})
	}()

// If this read does not time out, the pipe was incorrectly
	// put into blocking mode.
	_, err = r.Read(make([]byte, 1))
	if err == nil {
		t.Error("Read did not time out")
	} else if !os.IsTimeout(err) {
		t.Errorf("got error %v, expected a time out", err)
	}

wg.Wait()
}

// Issue 43822: tests that returns EOF when conn write timeout.
func TestSendfileOnWriteTimeoutExceeded(t *testing.T) {
	ln := newLocalListener(t, "tcp")
	defer ln.Close()

errc := make(chan error, 1)
	go func(ln Listener) (retErr error) {
		defer func() {
			errc <- retErr
			close(errc)
		}()

conn, err := ln.Accept()
		if err != nil {
			return err
		}
		defer conn.Close()

// Set the write deadline in the past(1h ago). It makes
		// sure that it is always write timeout.
		if err := conn.SetWriteDeadline(time.Now().Add(-1 * time.Hour)); err != nil {
			return err
		}

f, err := os.Open(newton)
		if err != nil {
			return err
		}
		defer f.Close()

_, err = io.Copy(conn, f)
		if errors.Is(err, os.ErrDeadlineExceeded) {
			return nil
		}

if err == nil {
			err = fmt.Errorf("expected ErrDeadlineExceeded, but got nil")
		}
		return err
	}(ln)

conn, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()

n, err := io.Copy(io.Discard, conn)
	if err != nil {
		t.Fatalf("expected nil error, but got %v", err)
	}
	if n != 0 {
		t.Fatalf("expected receive zero, but got %d byte(s)", n)
	}

if err := <-errc; err != nil {
		t.Fatal(err)
	}
}