What is the method for implementing a daemon process in Golang?

In Golang, you can implement a daemon process using the following methods:

1. Start a new process using the Start method in the os/exec package, and exit in the parent process:

package main

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

func main() {
	cmd := exec.Command("/path/to/your/program")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	err := cmd.Start()
	if err != nil {
		log.Fatal(err)
	}

	os.Exit(0)
}

1. Start a new process using the os.StartProcess method and exit the parent process.

package main

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

func main() {
	attr := &os.ProcAttr{
		Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
	}

	pid, err := os.StartProcess("/path/to/your/program", nil, attr)
	if err != nil {
		log.Fatal(err)
	}

	os.Exit(0)
}

Both of these methods will execute the program you want to guard in a new process, and exit in the parent process. It is important to note that the stdin, stdout, and stderr of the new process need to be correctly redirected in the parent process so that the output can be properly recorded when running in the background.

There are also other details related to the supervisor process, such as handling signals, restarting processes, etc., which can be implemented based on specific needs.