1 files changed, 181 insertions, 0 deletions
diff --git a/src/net/example_test.go b/src/net/example_test.go
new file mode 100644
index 0000000..72c7183
--- /dev/null
+++ b/src/net/example_test.go
@@ -0,0 +1,181 @@
+// 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.
+
+package net_test
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"time"
+)
+
+func ExampleListener() {
+	// Listen on TCP port 2000 on all available unicast and
+	// anycast IP addresses of the local system.
+	l, err := net.Listen("tcp", ":2000")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer l.Close()
+	for {
+		// Wait for a connection.
+		conn, err := l.Accept()
+		if err != nil {
+			log.Fatal(err)
+		}
+		// Handle the connection in a new goroutine.
+		// The loop then returns to accepting, so that
+		// multiple connections may be served concurrently.
+		go func(c net.Conn) {
+			// Echo all incoming data.
+			io.Copy(c, c)
+			// Shut down the connection.
+			c.Close()
+		}(conn)
+	}
+}
+
+func ExampleDialer() {
+	var d net.Dialer
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	conn, err := d.DialContext(ctx, "tcp", "localhost:12345")
+	if err != nil {
+		log.Fatalf("Failed to dial: %v", err)
+	}
+	defer conn.Close()
+
+	if _, err := conn.Write([]byte("Hello, World!")); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleDialer_unix() {
+	// DialUnix does not take a context.Context parameter. This example shows
+	// how to dial a Unix socket with a Context. Note that the Context only
+	// applies to the dial operation; it does not apply to the connection once
+	// it has been established.
+	var d net.Dialer
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	d.LocalAddr = nil // if you have a local addr, add it here
+	raddr := net.UnixAddr{Name: "/path/to/unix.sock", Net: "unix"}
+	conn, err := d.DialContext(ctx, "unix", raddr.String())
+	if err != nil {
+		log.Fatalf("Failed to dial: %v", err)
+	}
+	defer conn.Close()
+	if _, err := conn.Write([]byte("Hello, socket!")); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleIPv4() {
+	fmt.Println(net.IPv4(8, 8, 8, 8))
+
+	// Output:
+	// 8.8.8.8
+}
+
+func ExampleParseCIDR() {
+	ipv4Addr, ipv4Net, err := net.ParseCIDR("192.0.2.1/24")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(ipv4Addr)
+	fmt.Println(ipv4Net)
+
+	ipv6Addr, ipv6Net, err := net.ParseCIDR("2001:db8:a0b:12f0::1/32")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(ipv6Addr)
+	fmt.Println(ipv6Net)
+
+	// Output:
+	// 192.0.2.1
+	// 192.0.2.0/24
+	// 2001:db8:a0b:12f0::1
+	// 2001:db8::/32
+}
+
+func ExampleParseIP() {
+	fmt.Println(net.ParseIP("192.0.2.1"))
+	fmt.Println(net.ParseIP("2001:db8::68"))
+	fmt.Println(net.ParseIP("192.0.2"))
+
+	// Output:
+	// 192.0.2.1
+	// 2001:db8::68
+	// <nil>
+}
+
+func ExampleIP_DefaultMask() {
+	ip := net.ParseIP("192.0.2.1")
+	fmt.Println(ip.DefaultMask())
+
+	// Output:
+	// ffffff00
+}
+
+func ExampleIP_Mask() {
+	ipv4Addr := net.ParseIP("192.0.2.1")
+	// This mask corresponds to a /24 subnet for IPv4.
+	ipv4Mask := net.CIDRMask(24, 32)
+	fmt.Println(ipv4Addr.Mask(ipv4Mask))
+
+	ipv6Addr := net.ParseIP("2001:db8:a0b:12f0::1")
+	// This mask corresponds to a /32 subnet for IPv6.
+	ipv6Mask := net.CIDRMask(32, 128)
+	fmt.Println(ipv6Addr.Mask(ipv6Mask))
+
+	// Output:
+	// 192.0.2.0
+	// 2001:db8::
+}
+
+func ExampleCIDRMask() {
+	// This mask corresponds to a /31 subnet for IPv4.
+	fmt.Println(net.CIDRMask(31, 32))
+
+	// This mask corresponds to a /64 subnet for IPv6.
+	fmt.Println(net.CIDRMask(64, 128))
+
+	// Output:
+	// fffffffe
+	// ffffffffffffffff0000000000000000
+}
+
+func ExampleIPv4Mask() {
+	fmt.Println(net.IPv4Mask(255, 255, 255, 0))
+
+	// Output:
+	// ffffff00
+}
+
+func ExampleUDPConn_WriteTo() {
+	// Unlike Dial, ListenPacket creates a connection without any
+	// association with peers.
+	conn, err := net.ListenPacket("udp", ":0")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer conn.Close()
+
+	dst, err := net.ResolveUDPAddr("udp", "192.0.2.1:2000")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// The connection can write data to the desired address.
+	_, err = conn.WriteTo([]byte("data"), dst)
+	if err != nil {
+		log.Fatal(err)
+	}
+}