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      1 // Copyright 2012 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package net_test
      6 
      7 import (
      8 	"io"
      9 	"log"
     10 	"net"
     11 )
     12 
     13 func ExampleListener() {
     14 	// Listen on TCP port 2000 on all interfaces.
     15 	l, err := net.Listen("tcp", ":2000")
     16 	if err != nil {
     17 		log.Fatal(err)
     18 	}
     19 	defer l.Close()
     20 	for {
     21 		// Wait for a connection.
     22 		conn, err := l.Accept()
     23 		if err != nil {
     24 			log.Fatal(err)
     25 		}
     26 		// Handle the connection in a new goroutine.
     27 		// The loop then returns to accepting, so that
     28 		// multiple connections may be served concurrently.
     29 		go func(c net.Conn) {
     30 			// Echo all incoming data.
     31 			io.Copy(c, c)
     32 			// Shut down the connection.
     33 			c.Close()
     34 		}(conn)
     35 	}
     36 }
     37