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Current Path: /opt/golang/1.17.2/src/net

📁 ..
📄 addrselect.go(9.59 KB)
📄 addrselect_test.go(6.28 KB)
📄 cgo_aix.go(603 B)
📄 cgo_android.go(293 B)
📄 cgo_bsd.go(419 B)
📄 cgo_linux.go(672 B)
📄 cgo_netbsd.go(297 B)
📄 cgo_openbsd.go(297 B)
📄 cgo_resnew.go(668 B)
📄 cgo_resold.go(654 B)
📄 cgo_socknew.go(816 B)
📄 cgo_sockold.go(937 B)
📄 cgo_solaris.go(364 B)
📄 cgo_stub.go(1.08 KB)
📄 cgo_unix.go(9.65 KB)
📄 cgo_unix_test.go(2.01 KB)
📄 cgo_windows.go(423 B)
📄 conf.go(8.78 KB)
📄 conf_netcgo.go(387 B)
📄 conf_test.go(9.76 KB)
📄 conn_test.go(1.79 KB)
📄 dial.go(22.72 KB)
📄 dial_test.go(26.02 KB)
📄 dial_unix_test.go(2.83 KB)
📄 dnsclient.go(5.73 KB)
📄 dnsclient_test.go(1.51 KB)
📄 dnsclient_unix.go(22.12 KB)
📄 dnsclient_unix_test.go(54.46 KB)
📄 dnsconfig_unix.go(5.56 KB)
📄 dnsconfig_unix_test.go(6.83 KB)
📄 dnsname_test.go(1.99 KB)
📄 error_plan9.go(224 B)
📄 error_plan9_test.go(398 B)
📄 error_posix.go(700 B)
📄 error_posix_test.go(998 B)
📄 error_test.go(19.59 KB)
📄 error_unix.go(517 B)
📄 error_unix_test.go(702 B)
📄 error_windows.go(355 B)
📄 error_windows_test.go(483 B)
📄 example_test.go(3.88 KB)
📄 external_test.go(4.08 KB)
📄 fcntl_libc_test.go(400 B)
📄 fcntl_syscall_test.go(545 B)
📄 fd_plan9.go(3.56 KB)
📄 fd_posix.go(2.58 KB)
📄 fd_unix.go(5.54 KB)
📄 fd_windows.go(4.62 KB)
📄 file.go(1.69 KB)
📄 file_plan9.go(2.68 KB)
📄 file_stub.go(507 B)
📄 file_test.go(6.55 KB)
📄 file_unix.go(2.6 KB)
📄 file_windows.go(521 B)
📄 hook.go(628 B)
📄 hook_plan9.go(283 B)
📄 hook_unix.go(840 B)
📄 hook_windows.go(875 B)
📄 hosts.go(3.1 KB)
📄 hosts_test.go(4.59 KB)
📁 http
📄 interface.go(7.17 KB)
📄 interface_aix.go(4.41 KB)
📄 interface_bsd.go(2.8 KB)
📄 interface_bsd_test.go(1.48 KB)
📄 interface_bsdvar.go(753 B)
📄 interface_darwin.go(1.29 KB)
📄 interface_freebsd.go(1.42 KB)
📄 interface_linux.go(6.9 KB)
📄 interface_linux_test.go(3.65 KB)
📄 interface_plan9.go(4.68 KB)
📄 interface_solaris.go(2.07 KB)
📄 interface_stub.go(830 B)
📄 interface_test.go(9.68 KB)
📄 interface_unix_test.go(4.79 KB)
📄 interface_windows.go(5.41 KB)
📁 internal
📄 ip.go(17.66 KB)
📄 ip_test.go(25.33 KB)
📄 iprawsock.go(7.08 KB)
📄 iprawsock_plan9.go(874 B)
📄 iprawsock_posix.go(3.56 KB)
📄 iprawsock_test.go(5.63 KB)
📄 ipsock.go(8.97 KB)
📄 ipsock_plan9.go(7.5 KB)
📄 ipsock_plan9_test.go(645 B)
📄 ipsock_posix.go(6.28 KB)
📄 ipsock_test.go(6.81 KB)
📄 listen_test.go(21.34 KB)
📄 lookup.go(21.33 KB)
📄 lookup_fake.go(1.66 KB)
📄 lookup_plan9.go(7.68 KB)
📄 lookup_test.go(31.13 KB)
📄 lookup_unix.go(8.89 KB)
📄 lookup_windows.go(11.72 KB)
📄 lookup_windows_test.go(8.02 KB)
📄 mac.go(1.88 KB)
📄 mac_test.go(3.26 KB)
📁 mail
📄 main_cloexec_test.go(750 B)
📄 main_conf_test.go(952 B)
📄 main_noconf_test.go(537 B)
📄 main_plan9_test.go(392 B)
📄 main_posix_test.go(1.4 KB)
📄 main_test.go(7.13 KB)
📄 main_unix_test.go(1.33 KB)
📄 main_windows_test.go(1.08 KB)
📄 mockserver_test.go(11.39 KB)
📄 net.go(22.37 KB)
📄 net_fake.go(5.37 KB)
📄 net_test.go(13.88 KB)
📄 net_windows_test.go(15.94 KB)
📄 netgo_unix_test.go(741 B)
📄 nss.go(3.8 KB)
📄 nss_test.go(3.42 KB)
📄 packetconn_test.go(3.57 KB)
📄 parse.go(7.33 KB)
📄 parse_test.go(2.14 KB)
📄 pipe.go(5.43 KB)
📄 pipe_test.go(1.2 KB)
📄 platform_test.go(4.57 KB)
📄 port.go(1.46 KB)
📄 port_test.go(1.34 KB)
📄 port_unix.go(1.39 KB)
📄 protoconn_test.go(7.24 KB)
📄 rawconn.go(1.89 KB)
📄 rawconn_stub_test.go(655 B)
📄 rawconn_test.go(4.45 KB)
📄 rawconn_unix_test.go(3.1 KB)
📄 rawconn_windows_test.go(3.12 KB)
📁 rpc
📄 sendfile_linux.go(1.1 KB)
📄 sendfile_stub.go(391 B)
📄 sendfile_test.go(6.91 KB)
📄 sendfile_unix_alt.go(2.02 KB)
📄 sendfile_windows.go(1.02 KB)
📄 server_test.go(11.11 KB)
📁 smtp
📄 sock_bsd.go(968 B)
📄 sock_cloexec.go(1.53 KB)
📄 sock_linux.go(1.53 KB)
📄 sock_linux_test.go(545 B)
📄 sock_plan9.go(262 B)
📄 sock_posix.go(6.92 KB)
📄 sock_stub.go(420 B)
📄 sock_windows.go(1.16 KB)
📄 sockaddr_posix.go(1.05 KB)
📄 sockopt_aix.go(1.43 KB)
📄 sockopt_bsd.go(2.26 KB)
📄 sockopt_linux.go(1.25 KB)
📄 sockopt_plan9.go(406 B)
📄 sockopt_posix.go(2.76 KB)
📄 sockopt_solaris.go(1.25 KB)
📄 sockopt_stub.go(760 B)
📄 sockopt_windows.go(1.51 KB)
📄 sockoptip_bsdvar.go(929 B)
📄 sockoptip_linux.go(735 B)
📄 sockoptip_posix.go(1.53 KB)
📄 sockoptip_stub.go(971 B)
📄 sockoptip_windows.go(819 B)
📄 splice_linux.go(1.09 KB)
📄 splice_stub.go(304 B)
📄 splice_test.go(10.51 KB)
📄 sys_cloexec.go(1 KB)
📄 tcpsock.go(9.88 KB)
📄 tcpsock_plan9.go(2.13 KB)
📄 tcpsock_posix.go(5.39 KB)
📄 tcpsock_test.go(17.53 KB)
📄 tcpsock_unix_test.go(2.41 KB)
📄 tcpsockopt_darwin.go(770 B)
📄 tcpsockopt_dragonfly.go(698 B)
📄 tcpsockopt_openbsd.go(365 B)
📄 tcpsockopt_plan9.go(525 B)
📄 tcpsockopt_posix.go(592 B)
📄 tcpsockopt_solaris.go(1.15 KB)
📄 tcpsockopt_stub.go(415 B)
📄 tcpsockopt_unix.go(757 B)
📄 tcpsockopt_windows.go(741 B)
📁 testdata
📁 textproto
📄 timeout_test.go(23.39 KB)
📄 udpsock.go(9.19 KB)
📄 udpsock_plan9.go(3.79 KB)
📄 udpsock_plan9_test.go(1.31 KB)
📄 udpsock_posix.go(4.27 KB)
📄 udpsock_test.go(12.27 KB)
📄 unixsock.go(10.17 KB)
📄 unixsock_linux_test.go(2.29 KB)
📄 unixsock_plan9.go(1.24 KB)
📄 unixsock_posix.go(6.03 KB)
📄 unixsock_readmsg_cloexec.go(691 B)
📄 unixsock_readmsg_cmsg_cloexec.go(373 B)
📄 unixsock_readmsg_other.go(301 B)
📄 unixsock_readmsg_test.go(2.62 KB)
📄 unixsock_test.go(10.56 KB)
📄 unixsock_windows_test.go(2.09 KB)
📁 url
📄 write_unix_test.go(1.67 KB)
📄 writev_test.go(5.02 KB)
📄 writev_unix.go(797 B)

Editing: tcpsock_test.go

// Copyright 2012 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
// +build !js

package net

import (
	"fmt"
	"internal/testenv"
	"io"
	"os"
	"reflect"
	"runtime"
	"sync"
	"testing"
	"time"
)

func BenchmarkTCP4OneShot(b *testing.B) {
	benchmarkTCP(b, false, false, "127.0.0.1:0")
}

func BenchmarkTCP4OneShotTimeout(b *testing.B) {
	benchmarkTCP(b, false, true, "127.0.0.1:0")
}

func BenchmarkTCP4Persistent(b *testing.B) {
	benchmarkTCP(b, true, false, "127.0.0.1:0")
}

func BenchmarkTCP4PersistentTimeout(b *testing.B) {
	benchmarkTCP(b, true, true, "127.0.0.1:0")
}

func BenchmarkTCP6OneShot(b *testing.B) {
	if !supportsIPv6() {
		b.Skip("ipv6 is not supported")
	}
	benchmarkTCP(b, false, false, "[::1]:0")
}

func BenchmarkTCP6OneShotTimeout(b *testing.B) {
	if !supportsIPv6() {
		b.Skip("ipv6 is not supported")
	}
	benchmarkTCP(b, false, true, "[::1]:0")
}

func BenchmarkTCP6Persistent(b *testing.B) {
	if !supportsIPv6() {
		b.Skip("ipv6 is not supported")
	}
	benchmarkTCP(b, true, false, "[::1]:0")
}

func BenchmarkTCP6PersistentTimeout(b *testing.B) {
	if !supportsIPv6() {
		b.Skip("ipv6 is not supported")
	}
	benchmarkTCP(b, true, true, "[::1]:0")
}

func benchmarkTCP(b *testing.B, persistent, timeout bool, laddr string) {
	testHookUninstaller.Do(uninstallTestHooks)

func BenchmarkTCP4ConcurrentReadWrite(b *testing.B) {
	benchmarkTCPConcurrentReadWrite(b, "127.0.0.1:0")
}

func BenchmarkTCP6ConcurrentReadWrite(b *testing.B) {
	if !supportsIPv6() {
		b.Skip("ipv6 is not supported")
	}
	benchmarkTCPConcurrentReadWrite(b, "[::1]:0")
}

func benchmarkTCPConcurrentReadWrite(b *testing.B, laddr string) {
	testHookUninstaller.Do(uninstallTestHooks)

// The benchmark creates GOMAXPROCS client/server pairs.
	// Each pair creates 4 goroutines: client reader/writer and server reader/writer.
	// The benchmark stresses concurrent reading and writing to the same connection.
	// Such pattern is used in net/http and net/rpc.

b.StopTimer()

P := runtime.GOMAXPROCS(0)
	N := b.N / P
	W := 1000

// Setup P client/server connections.
	clients := make([]Conn, P)
	servers := make([]Conn, P)
	ln, err := Listen("tcp", laddr)
	if err != nil {
		b.Fatal(err)
	}
	defer ln.Close()
	done := make(chan bool)
	go func() {
		for p := 0; p < P; p++ {
			s, err := ln.Accept()
			if err != nil {
				b.Error(err)
				return
			}
			servers[p] = s
		}
		done <- true
	}()
	for p := 0; p < P; p++ {
		c, err := Dial("tcp", ln.Addr().String())
		if err != nil {
			b.Fatal(err)
		}
		clients[p] = c
	}
	<-done

b.StartTimer()

var wg sync.WaitGroup
	wg.Add(4 * P)
	for p := 0; p < P; p++ {
		// Client writer.
		go func(c Conn) {
			defer wg.Done()
			var buf [1]byte
			for i := 0; i < N; i++ {
				v := byte(i)
				for w := 0; w < W; w++ {
					v *= v
				}
				buf[0] = v
				_, err := c.Write(buf[:])
				if err != nil {
					b.Error(err)
					return
				}
			}
		}(clients[p])

// Pipe between server reader and server writer.
		pipe := make(chan byte, 128)

// Server reader.
		go func(s Conn) {
			defer wg.Done()
			var buf [1]byte
			for i := 0; i < N; i++ {
				_, err := s.Read(buf[:])
				if err != nil {
					b.Error(err)
					return
				}
				pipe <- buf[0]
			}
		}(servers[p])

// Server writer.
		go func(s Conn) {
			defer wg.Done()
			var buf [1]byte
			for i := 0; i < N; i++ {
				v := <-pipe
				for w := 0; w < W; w++ {
					v *= v
				}
				buf[0] = v
				_, err := s.Write(buf[:])
				if err != nil {
					b.Error(err)
					return
				}
			}
			s.Close()
		}(servers[p])

// Client reader.
		go func(c Conn) {
			defer wg.Done()
			var buf [1]byte
			for i := 0; i < N; i++ {
				_, err := c.Read(buf[:])
				if err != nil {
					b.Error(err)
					return
				}
			}
			c.Close()
		}(clients[p])
	}
	wg.Wait()
}

type resolveTCPAddrTest struct {
	network       string
	litAddrOrName string
	addr          *TCPAddr
	err           error
}

var resolveTCPAddrTests = []resolveTCPAddrTest{
	{"tcp", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil},
	{"tcp4", "127.0.0.1:65535", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 65535}, nil},

{"tcp", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil},
	{"tcp6", "[::1]:65535", &TCPAddr{IP: ParseIP("::1"), Port: 65535}, nil},

{"tcp", "[::1%en0]:1", &TCPAddr{IP: ParseIP("::1"), Port: 1, Zone: "en0"}, nil},
	{"tcp6", "[::1%911]:2", &TCPAddr{IP: ParseIP("::1"), Port: 2, Zone: "911"}, nil},

{"", "127.0.0.1:0", &TCPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil}, // Go 1.0 behavior
	{"", "[::1]:0", &TCPAddr{IP: ParseIP("::1"), Port: 0}, nil},         // Go 1.0 behavior

{"tcp", ":12345", &TCPAddr{Port: 12345}, nil},

{"http", "127.0.0.1:0", nil, UnknownNetworkError("http")},

{"tcp", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
	{"tcp", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("::ffff:127.0.0.1"), Port: 80}, nil},
	{"tcp", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},
	{"tcp4", "127.0.0.1:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
	{"tcp4", "[::ffff:127.0.0.1]:http", &TCPAddr{IP: ParseIP("127.0.0.1"), Port: 80}, nil},
	{"tcp6", "[2001:db8::1]:http", &TCPAddr{IP: ParseIP("2001:db8::1"), Port: 80}, nil},

{"tcp4", "[2001:db8::1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}},
	{"tcp6", "127.0.0.1:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "127.0.0.1"}},
	{"tcp6", "[::ffff:127.0.0.1]:http", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "::ffff:127.0.0.1"}},
}

func TestResolveTCPAddr(t *testing.T) {
	origTestHookLookupIP := testHookLookupIP
	defer func() { testHookLookupIP = origTestHookLookupIP }()
	testHookLookupIP = lookupLocalhost

for _, tt := range resolveTCPAddrTests {
		addr, err := ResolveTCPAddr(tt.network, tt.litAddrOrName)
		if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) {
			t.Errorf("ResolveTCPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err)
			continue
		}
		if err == nil {
			addr2, err := ResolveTCPAddr(addr.Network(), addr.String())
			if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err {
				t.Errorf("(%q, %q): ResolveTCPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr.Network(), addr.String(), addr2, err, tt.addr, tt.err)
			}
		}
	}
}

var tcpListenerNameTests = []struct {
	net   string
	laddr *TCPAddr
}{
	{"tcp4", &TCPAddr{IP: IPv4(127, 0, 0, 1)}},
	{"tcp4", &TCPAddr{}},
	{"tcp4", nil},
}

func TestTCPListenerName(t *testing.T) {
	testenv.MustHaveExternalNetwork(t)

for _, tt := range tcpListenerNameTests {
		ln, err := ListenTCP(tt.net, tt.laddr)
		if err != nil {
			t.Fatal(err)
		}
		defer ln.Close()
		la := ln.Addr()
		if a, ok := la.(*TCPAddr); !ok || a.Port == 0 {
			t.Fatalf("got %v; expected a proper address with non-zero port number", la)
		}
	}
}

func TestIPv6LinkLocalUnicastTCP(t *testing.T) {
	testenv.MustHaveExternalNetwork(t)

if !supportsIPv6() {
		t.Skip("IPv6 is not supported")
	}

for i, tt := range ipv6LinkLocalUnicastTCPTests {
		ln, err := Listen(tt.network, tt.address)
		if err != nil {
			// It might return "LookupHost returned no
			// suitable address" error on some platforms.
			t.Log(err)
			continue
		}
		ls, err := (&streamListener{Listener: ln}).newLocalServer()
		if err != nil {
			t.Fatal(err)
		}
		defer ls.teardown()
		ch := make(chan error, 1)
		handler := func(ls *localServer, ln Listener) { ls.transponder(ln, ch) }
		if err := ls.buildup(handler); err != nil {
			t.Fatal(err)
		}
		if la, ok := ln.Addr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
			t.Fatalf("got %v; expected a proper address with zone identifier", la)
		}

c, err := Dial(tt.network, ls.Listener.Addr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer c.Close()
		if la, ok := c.LocalAddr().(*TCPAddr); !ok || !tt.nameLookup && la.Zone == "" {
			t.Fatalf("got %v; expected a proper address with zone identifier", la)
		}
		if ra, ok := c.RemoteAddr().(*TCPAddr); !ok || !tt.nameLookup && ra.Zone == "" {
			t.Fatalf("got %v; expected a proper address with zone identifier", ra)
		}

if _, err := c.Write([]byte("TCP OVER IPV6 LINKLOCAL TEST")); err != nil {
			t.Fatal(err)
		}
		b := make([]byte, 32)
		if _, err := c.Read(b); err != nil {
			t.Fatal(err)
		}

for err := range ch {
			t.Errorf("#%d: %v", i, err)
		}
	}
}

func TestTCPConcurrentAccept(t *testing.T) {
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
	ln, err := Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	const N = 10
	var wg sync.WaitGroup
	wg.Add(N)
	for i := 0; i < N; i++ {
		go func() {
			for {
				c, err := ln.Accept()
				if err != nil {
					break
				}
				c.Close()
			}
			wg.Done()
		}()
	}
	attempts := 10 * N
	fails := 0
	d := &Dialer{Timeout: 200 * time.Millisecond}
	for i := 0; i < attempts; i++ {
		c, err := d.Dial("tcp", ln.Addr().String())
		if err != nil {
			fails++
		} else {
			c.Close()
		}
	}
	ln.Close()
	wg.Wait()
	if fails > attempts/9 { // see issues 7400 and 7541
		t.Fatalf("too many Dial failed: %v", fails)
	}
	if fails > 0 {
		t.Logf("# of failed Dials: %v", fails)
	}
}

func TestTCPReadWriteAllocs(t *testing.T) {
	switch runtime.GOOS {
	case "plan9":
		// The implementation of asynchronous cancelable
		// I/O on Plan 9 allocates memory.
		// See net/fd_io_plan9.go.
		t.Skipf("not supported on %s", runtime.GOOS)
	}

ln, err := Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer ln.Close()
	var server Conn
	errc := make(chan error, 1)
	go func() {
		var err error
		server, err = ln.Accept()
		errc <- err
	}()
	client, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer client.Close()
	if err := <-errc; err != nil {
		t.Fatal(err)
	}
	defer server.Close()

var buf [128]byte
	allocs := testing.AllocsPerRun(1000, func() {
		_, err := server.Write(buf[:])
		if err != nil {
			t.Fatal(err)
		}
		_, err = io.ReadFull(client, buf[:])
		if err != nil {
			t.Fatal(err)
		}
	})
	if allocs > 0 {
		t.Fatalf("got %v; want 0", allocs)
	}

var bufwrt [128]byte
	ch := make(chan bool)
	defer close(ch)
	go func() {
		for <-ch {
			_, err := server.Write(bufwrt[:])
			errc <- err
		}
	}()
	allocs = testing.AllocsPerRun(1000, func() {
		ch <- true
		if _, err = io.ReadFull(client, buf[:]); err != nil {
			t.Fatal(err)
		}
		if err := <-errc; err != nil {
			t.Fatal(err)
		}
	})
	if allocs > 0 {
		t.Fatalf("got %v; want 0", allocs)
	}
}

func TestTCPStress(t *testing.T) {
	const conns = 2
	const msgLen = 512
	msgs := int(1e4)
	if testing.Short() {
		msgs = 1e2
	}

sendMsg := func(c Conn, buf []byte) bool {
		n, err := c.Write(buf)
		if n != len(buf) || err != nil {
			t.Log(err)
			return false
		}
		return true
	}
	recvMsg := func(c Conn, buf []byte) bool {
		for read := 0; read != len(buf); {
			n, err := c.Read(buf)
			read += n
			if err != nil {
				t.Log(err)
				return false
			}
		}
		return true
	}

ln, err := Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	done := make(chan bool)
	// Acceptor.
	go func() {
		defer func() {
			done <- true
		}()
		for {
			c, err := ln.Accept()
			if err != nil {
				break
			}
			// Server connection.
			go func(c Conn) {
				defer c.Close()
				var buf [msgLen]byte
				for m := 0; m < msgs; m++ {
					if !recvMsg(c, buf[:]) || !sendMsg(c, buf[:]) {
						break
					}
				}
			}(c)
		}
	}()
	for i := 0; i < conns; i++ {
		// Client connection.
		go func() {
			defer func() {
				done <- true
			}()
			c, err := Dial("tcp", ln.Addr().String())
			if err != nil {
				t.Log(err)
				return
			}
			defer c.Close()
			var buf [msgLen]byte
			for m := 0; m < msgs; m++ {
				if !sendMsg(c, buf[:]) || !recvMsg(c, buf[:]) {
					break
				}
			}
		}()
	}
	for i := 0; i < conns; i++ {
		<-done
	}
	ln.Close()
	<-done
}

func TestTCPSelfConnect(t *testing.T) {
	if runtime.GOOS == "windows" {
		// TODO(brainman): do not know why it hangs.
		t.Skip("known-broken test on windows")
	}

ln, err := newLocalListener("tcp")
	if err != nil {
		t.Fatal(err)
	}
	var d Dialer
	c, err := d.Dial(ln.Addr().Network(), ln.Addr().String())
	if err != nil {
		ln.Close()
		t.Fatal(err)
	}
	network := c.LocalAddr().Network()
	laddr := *c.LocalAddr().(*TCPAddr)
	c.Close()
	ln.Close()

// Try to connect to that address repeatedly.
	n := 100000
	if testing.Short() {
		n = 1000
	}
	switch runtime.GOOS {
	case "darwin", "ios", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "illumos", "solaris", "windows":
		// Non-Linux systems take a long time to figure
		// out that there is nothing listening on localhost.
		n = 100
	}
	for i := 0; i < n; i++ {
		d.Timeout = time.Millisecond
		c, err := d.Dial(network, laddr.String())
		if err == nil {
			addr := c.LocalAddr().(*TCPAddr)
			if addr.Port == laddr.Port || addr.IP.Equal(laddr.IP) {
				t.Errorf("Dial %v should fail", addr)
			} else {
				t.Logf("Dial %v succeeded - possibly racing with other listener", addr)
			}
			c.Close()
		}
	}
}

// Test that >32-bit reads work on 64-bit systems.
// On 32-bit systems this tests that maxint reads work.
func TestTCPBig(t *testing.T) {
	if !*testTCPBig {
		t.Skip("test disabled; use -tcpbig to enable")
	}

for _, writev := range []bool{false, true} {
		t.Run(fmt.Sprintf("writev=%v", writev), func(t *testing.T) {
			ln, err := newLocalListener("tcp")
			if err != nil {
				t.Fatal(err)
			}
			defer ln.Close()

x := int(1 << 30)
			x = x*5 + 1<<20 // just over 5 GB on 64-bit, just over 1GB on 32-bit
			done := make(chan int)
			go func() {
				defer close(done)
				c, err := ln.Accept()
				if err != nil {
					t.Error(err)
					return
				}
				buf := make([]byte, x)
				var n int
				if writev {
					var n64 int64
					n64, err = (&Buffers{buf}).WriteTo(c)
					n = int(n64)
				} else {
					n, err = c.Write(buf)
				}
				if n != len(buf) || err != nil {
					t.Errorf("Write(buf) = %d, %v, want %d, nil", n, err, x)
				}
				c.Close()
			}()

c, err := Dial("tcp", ln.Addr().String())
			if err != nil {
				t.Fatal(err)
			}
			buf := make([]byte, x)
			n, err := io.ReadFull(c, buf)
			if n != len(buf) || err != nil {
				t.Errorf("Read(buf) = %d, %v, want %d, nil", n, err, x)
			}
			c.Close()
			<-done
		})
	}
}

func TestCopyPipeIntoTCP(t *testing.T) {
	ln, err := newLocalListener("tcp")
	if err != nil {
		t.Fatal(err)
	}
	defer ln.Close()

errc := make(chan error, 1)
	defer func() {
		if err := <-errc; err != nil {
			t.Error(err)
		}
	}()
	go func() {
		c, err := ln.Accept()
		if err != nil {
			errc <- err
			return
		}
		defer c.Close()

buf := make([]byte, 100)
		n, err := io.ReadFull(c, buf)
		if err != io.ErrUnexpectedEOF || n != 2 {
			errc <- fmt.Errorf("got err=%q n=%v; want err=%q n=2", err, n, io.ErrUnexpectedEOF)
			return
		}

errc <- nil
	}()

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

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

errc2 := make(chan error, 1)
	defer func() {
		if err := <-errc2; err != nil {
			t.Error(err)
		}
	}()

defer w.Close()

go func() {
		_, err := io.Copy(c, r)
		errc2 <- err
	}()

// Split write into 2 packets. That makes Windows TransmitFile
	// drop second packet.
	packet := make([]byte, 1)
	_, err = w.Write(packet)
	if err != nil {
		t.Fatal(err)
	}
	time.Sleep(100 * time.Millisecond)
	_, err = w.Write(packet)
	if err != nil {
		t.Fatal(err)
	}
}

func BenchmarkSetReadDeadline(b *testing.B) {
	ln, err := newLocalListener("tcp")
	if err != nil {
		b.Fatal(err)
	}
	defer ln.Close()
	var serv Conn
	done := make(chan error)
	go func() {
		var err error
		serv, err = ln.Accept()
		done <- err
	}()
	c, err := Dial("tcp", ln.Addr().String())
	if err != nil {
		b.Fatal(err)
	}
	defer c.Close()
	if err := <-done; err != nil {
		b.Fatal(err)
	}
	defer serv.Close()
	c.SetWriteDeadline(time.Now().Add(2 * time.Hour))
	deadline := time.Now().Add(time.Hour)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		c.SetReadDeadline(deadline)
		deadline = deadline.Add(1)
	}
}

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