How do I detach a child process from its parent in Go?

Forking a Process in Go

When running a process in Go, it is possible to keep the main program waiting for the child process to complete or to detach it from the parent process. To detach a process, it is necessary to use the fork system call, which creates a new process that shares the same memory space with the parent process.

Here is an example of how to demonize a process in Go:

package main

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

func main() {
    // Create a new process using fork
    cmd := exec.Command("/Path/prog")

    // Hide the window for Windows OS
    if os.Getenv("OS") == "Windows_NT" {
        cmd.SysProcAttr = &os.ProcAttr{Sys: &syscall.SysProcAttr{HideWindow: true}}
    }

    // Start the process
    if err := cmd.Start(); err != nil {
        fmt.Printf("%v", err)
        return
    }

    // Detach the child process from the parent process
    if err := cmd.Process.Release(); err != nil {
        fmt.Printf("%v", err)
        return
    }

    // The parent process can now continue executing
    fmt.Println("Child process detached successfully")
}

In this example, the os/exec package is used to create a new process using the exec.Command function. The SysProcAttr field is used to set the HideWindow flag to true for Windows operating systems, making the child process run in the background.

After starting the process using the cmd.Start() method, the cmd.Process.Release() method is called to detach the child process from the parent process. This allows the parent process to continue executing while the child process runs in the background.

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