相关疑难解决方法(0)

我有以下程序:

package main

import "bytes"
import "io"
import "log"
import "os"
import "os/exec"
import "time"

func main() {
    runCatFromStdinWorks(populateStdin("aaa\n"))
    runCatFromStdinWorks(populateStdin("bbb\n"))
}

func populateStdin(str string) func(io.WriteCloser) {
    return func(stdin io.WriteCloser) {
        defer stdin.Close()
        io.Copy(stdin, bytes.NewBufferString(str))
    }
}

func runCatFromStdinWorks(populate_stdin_func func(io.WriteCloser)) {
    cmd := exec.Command("cat")
    stdin, err := cmd.StdinPipe()
    if err != nil {
        log.Panic(err)
    }
    stdout, err := cmd.StdoutPipe()
    if err != nil {
        log.Panic(err)
    }
    err = cmd.Start()
    if err != nil {
        log.Panic(err)
    }
    go populate_stdin_func(stdin)
    go func() { …