golang exec后台进程并得到它的pid

我想运行一个将自己置于后台的命令(或者如果它使事情变得更有可能,在前台模式下运行命令并自己运行它),并获得后台进程的pid.我怎么在Go中这样做？我试过了：

cmd := exec.Command("ssh","-i",keyFile,"-o","ExitOnForwardFailure yes","-fqnNTL",fmt.Sprintf("%d:127.0.0.1:%d",port,port),fmt.Sprintf("%s@%s",serverUser,serverIP))
cmd.Start()
pid := cmd.Process.Pid
cmd.Wait()

这会立即返回〜,让ssh在后台运行,但是pid不是正在运行的ssh进程的pid(可能是它在分叉和后台自身之前的父ssh进程的pid).

我该怎么做呢？

你不需要任何特殊的东西,只是不要告诉ssh到背景本身而不是Wait().例：

$cat script.sh
#!/bin/sh
sleep 1
echo "I'm the script with pid $$"
for i in 1 2 3; do
        sleep 1
        echo "Still running $$"
done
$cat proc.go
package main

import (
       "log"
       "os"
       "os/exec"
)

func main() {
     cmd := exec.Command("./script.sh")
     cmd.Stdout = os.Stdout
     err := cmd.Start()
     if err != nil {
        log.Fatal(err)
     }
     log.Printf("Just ran subprocess %d,exiting\n",cmd.Process.Pid)
}
$go run proc.go
2016/09/15 17:01:03 Just ran subprocess 3794,exiting
$I'm the script with pid 3794
Still running 3794
Still running 3794
Still running 3794