package main

import (

"fmt"

"log"

"net/http"

"os"

"os/signal"

"syscall"

)

func main() {

File,err := os.Create("log")

if err != nil {

fmt.Println("创建日志文件错误",err)

return

}

log.SetOutput(File)

ce("pid")

}

func ce(pid string) {

File,err := os.OpenFile(pid,os.O_RDWR|os.O_CREATE,0644)

if err != nil {

log.Println(err)

return

}

info,_ := File.Stat()

if info.Size() != 0 {

log.Println("pid file is exist")

return

}

if os.Getppid() != 1 {

args := append([]string{os.Args[0]},os.Args[1:]...)

os.StartProcess(os.Args[0],args,&os.ProcAttr{Files: []*os.File{os.Stdin,os.Stdout,os.Stderr}})

return

}

File.WriteString(fmt.Sprint(os.Getpid()))

c := make(chan os.Signal,1)

signal.Notify(c,os.Interrupt,syscall.SIGUSR2)

go HttpServer()

for {

s := <-c

switch s {

case syscall.SIGUSR2:

fmt.Println("自定义型号.")

case os.Interrupt:

fmt.Println("安全退出")

Exit(File)

}

}

}

func HttpServer() {

http.HandleFunc("/",route)

http.ListenAndServe(":1789",nil)

}

func route(w http.ResponseWriter,r *http.Request) {

log.Println(r.URL.Path)

fmt.Fprint(w,"Hello World\n")

}

func Exit(F *os.File) {

F.Close()

os.Remove(F.Name())

fmt.Println("bye")

}