copy_interrupt.go

package main

import (
	"os"
	"io"
	"syscall"
	"time"
	"bytes"
)

func main() {
	fd2, err := syscall.Dup(int(os.Stdin.Fd()))
	if err != nil {
		panic(err)
	}
	stdin2 := os.NewFile(uintptr(fd2), "stdin2")
	go io.Copy(os.Stdout, stdin2)

	time.Sleep(5 * time.Second)

	stdin2.Close()
	os.Stdout.WriteString("\n--- stdin2 closed ---\n")
	var buf = make([]byte, 128)
	for {
		n, _ := os.Stdin.Read(buf)
		os.Stdout.Write( bytes.ToUpper(buf[:n]) )
	}
}