// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan. // License: https://creativecommons.org/licenses/by-nc-sa/4.0/ // See page 227. // Netcat is a simple read/write client for TCP servers. package main import ( "io" "log" "net" "os" ) //!+ func main() { conn, err := net.Dial("tcp", "localhost:8000") if err != nil { log.Fatal(err) } done := make(chan struct{}) go func() { io.Copy(os.Stdout, conn) // NOTE: ignoring errors log.Println("done") done <- struct{}{} // signal the main goroutine }() mustCopy(conn, os.Stdin) conn.Close() <-done // wait for background goroutine to finish } //!- func mustCopy(dst io.Writer, src io.Reader) { if _, err := io.Copy(dst, src); err != nil { log.Fatal(err) } }