How to Detach a Child Process in Go: Why os.SysProcAttr is the Wrong Tool for the Job?

Forking a Process: Handling Detachment and Error Messages

In Go, process forking allows you to create a child process that runs independently of its parent. This can be useful for various reasons, such as background processing or service creation.

Your provided code creates a child process using os.StartProcess but struggles with detaching the child from the command line, keeping them connected. To address this issue, you attempt to hide the child's window using procAttr.Sys.HideWindow, but encounter an error related to a memory pointer.

The error you encountered is due to setting the Sys field of the ProcAttr struct incorrectly. In Go, os.StartProcess expects the Sys field to be of the type corresponding to the underlying operating system. For Windows, the correct type is syscall.SysProcAttr.

To resolve the error, modify the code to use syscall.SysProcAttr instead of os.SysProcAttr:

package main

import (
    "fmt"
    "os"
    "os/exec"
    "syscall"
)

func start() {
    var procAttr syscall.SysProcAttr
    procAttr.Files = []*os.File{nil, nil, nil}
    cmd := exec.Command("c:\Path\to\program.exe")
    cmd.SysProcAttr = &procAttr
    if err := cmd.Start(); err != nil {
        fmt.Printf("%v", err)
    }
}

func main() {
    start()
}

By using a dedicated syscall type for the operating system-specific settings, you can avoid the error and successfully detach the child process from the command line.

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