How to Decouple a Go Process from the Command Prompt?

Decoupling a Process from the Command Prompt in Go

In Go, decoupling a forked process from the command prompt can be achieved through low-level operating system interactions. One option is to employ the ProcAttr type provided by the os package. However, simply hiding the window using procAttr.Sys.HideWindow may lead to unexpected errors.

To overcome this issue, an alternative approach is available. Go language provides a linker option -Hwindowsgui that can be used in conjunction with the 8l tool. This option explicitly sets the process as a graphical user interface (GUI) application, enabling the creation of a detached process without the need for additional window manipulation.

To illustrate this technique, consider the following code snippet:

<code class="go">package main

import (
   "fmt"
   "os/exec"
)

func main() {
   cmd := exec.Command("go", "run", "my_program.go")
   cmd.SysProcAttr = &syscall.SysProcAttr{
      CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
   }
   err := cmd.Start()
   if err != nil {
      fmt.Printf("Error starting process: %v", err)
      return
   }
}</code>

In this modified example, we use the SysProcAttr field to set the CreationFlags parameter. By specifying CREATE_NEW_PROCESS_GROUP, we ensure that the newly created process does not share a console with the parent process, thereby detaching it from the command prompt. This allows the program to run independently without being tied to the terminal session.

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