TCP echo server/client to be used with strace

echo_client.go

package main

import (
	"log"
	"net"
)

func main() {
	conn, err := net.Dial("tcp", "localhost:8080")
	if err != nil {
		log.Fatal(err)
	}

	_, err = conn.Write([]byte("test"))
	if err != nil {
		log.Fatal(err)
	}

	buff := make([]byte, 64)
	_, err = conn.Read(buff)
	if err != nil {
		log.Fatal(err)
	}

	err = conn.Close()
	if err != nil {
		log.Fatal(err)
	}
}

echo_server.go

package main

import (
	"fmt"
	"io"
	"log"
	"net"
)

func main() {
	fmt.Println("\n===== net.Listen() =====")
	ln, err := net.Listen("tcp", ":8080")
	if err != nil {
		log.Fatal(err)
	}

	for {
		fmt.Println("\n===== ln.Accept() =====")
		conn, err := ln.Accept()
		if err != nil {
			log.Print(err)
			continue
		}

		// Not start go routine here for the readability of the strace output.

		fmt.Println("\n===== io.Copy() =====")
		_, err = io.Copy(conn, conn) // blocked until the client closes the conn.
		if err != nil {
			log.Print(err)
			continue
		}

		fmt.Println("\n===== conn.Close() =====")
		if err = conn.Close(); err != nil {
			log.Print(err)
		}
	}
}