mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-10 00:13:43 +00:00
44 lines
768 B
Go
44 lines
768 B
Go
|
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
|
||
|
|
// See page 219.
|
||
|
|
//!+
|
||
|
|
|
||
|
|
// Clock1 is a TCP server that periodically writes the time.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"io"
|
||
|
|
"log"
|
||
|
|
"net"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
listener, err := net.Listen("tcp", "localhost:8000")
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
for {
|
||
|
|
conn, err := listener.Accept()
|
||
|
|
if err != nil {
|
||
|
|
log.Print(err) // e.g., connection aborted
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
handleConn(conn) // handle one connection at a time
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func handleConn(c net.Conn) {
|
||
|
|
defer c.Close()
|
||
|
|
for {
|
||
|
|
_, err := io.WriteString(c, time.Now().Format("15:04:05\n"))
|
||
|
|
if err != nil {
|
||
|
|
return // e.g., client disconnected
|
||
|
|
}
|
||
|
|
time.Sleep(1 * time.Second)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//!-
|