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https://github.com/gopl-zh/gopl-zh.github.com.git
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44 lines
768 B
Go
44 lines
768 B
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 219.
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//!+
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// Clock1 is a TCP server that periodically writes the time.
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package main
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import (
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"io"
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"log"
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"net"
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"time"
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)
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func main() {
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listener, err := net.Listen("tcp", "localhost:8000")
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if err != nil {
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log.Fatal(err)
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}
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Print(err) // e.g., connection aborted
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continue
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}
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handleConn(conn) // handle one connection at a time
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}
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}
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func handleConn(c net.Conn) {
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defer c.Close()
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for {
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_, err := io.WriteString(c, time.Now().Format("15:04:05\n"))
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if err != nil {
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return // e.g., client disconnected
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}
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time.Sleep(1 * time.Second)
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}
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}
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//!-
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