From 18033415c26d32299dacd79d312216f6d9f8369c Mon Sep 17 00:00:00 2001
From: fantasticbin <fantasticbin@vip.qq.com>
Date: Sun, 15 Jun 2025 21:13:40 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E5=A4=9A=E8=BF=9B=E7=A8=8B?=
 =?UTF-8?q?=E6=A8=A1=E5=BC=8F=E7=9A=84=E7=A4=BA=E4=BE=8B?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 prefork/prefork.go | 152 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 prefork/prefork.go

diff --git a/prefork/prefork.go b/prefork/prefork.go
new file mode 100644
index 0000000..98a67f4
--- /dev/null
+++ b/prefork/prefork.go
@@ -0,0 +1,152 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"io"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
+)
+
+var (
+	c       = flag.Int("c", 10, "concurrency level, default 10")
+	prefork = flag.Bool("prefork", false, "use prefork mode")
+	child   = flag.Bool("child", false, "is child process")
+)
+
+func main() {
+	flag.Parse()
+
+	var ln net.Listener
+	var err error
+
+	if *prefork { // 如果要启动子进程模式
+		ln = doPrefork(*c)
+	} else {
+		ln, err = net.Listen("tcp", ":8972")
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	start(ln) // 处理 net.Listener
+}
+
+func start(ln net.Listener) {
+	log.Println("started")
+	for {
+		conn, e := ln.Accept()
+		if e != nil {
+			var ne net.Error
+			if errors.As(e, &ne) && ne.Temporary() {
+				log.Printf("accept temp err: %v", ne)
+				continue
+			}
+
+			log.Printf("accept err: %v", e)
+			return
+		}
+
+		go func() {
+			_, err := io.Copy(conn, conn) // 实现 echo 协议，将收到的东西原样返回
+			if err != nil {
+				log.Printf("copy err: %v", err)
+			}
+		}()
+	}
+}
+
+func doPrefork(c int) net.Listener {
+	if *child {
+		// 子进程：从文件描述符恢复监听器
+		listener, err := net.FileListener(os.NewFile(3, ""))
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		// 优雅关闭处理
+		sigCh := make(chan os.Signal, 1)
+		signal.Notify(sigCh, syscall.SIGTERM)
+		go func() {
+			<-sigCh
+			err := listener.Close()
+			if err != nil {
+				return
+			}
+		}()
+
+		return listener
+	}
+
+	// 主进程：创建监听器并将其传递给子进程
+	addr, err := net.ResolveTCPAddr("tcp", ":8972")
+	if err != nil {
+		log.Fatal(err)
+	}
+	tcpListener, err := net.ListenTCP("tcp", addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fl, err := tcpListener.File()
+	if err != nil {
+		log.Fatal(err)
+	}
+	// 主进程不需要保持监听
+	if err := tcpListener.Close(); err != nil {
+		log.Fatal(err)
+	}
+
+	// 启动子进程并持续监控
+	children := make([]*exec.Cmd, c)
+
+	// 处理信号以优雅关闭
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	// 启动子进程管理协程
+	go func() {
+		<-sigCh
+		// 收到信号后通知所有子进程优雅关闭
+		for _, child := range children {
+			if child.Process != nil {
+				if err := child.Process.Signal(syscall.SIGTERM); err != nil {
+					log.Fatal(err)
+				}
+			}
+		}
+		os.Exit(0)
+	}()
+
+	// 声明子进程启动函数以便递归调用
+	var startChildProcess func(int)
+	startChildProcess = func(i int) {
+		cmd := exec.Command(os.Args[0], "-prefork", "-child")
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		cmd.ExtraFiles = []*os.File{fl}
+		children[i] = cmd
+
+		if err := cmd.Start(); err != nil {
+			log.Fatalf("启动子进程 %d 失败: %v", i, err)
+		}
+
+		// 在单独的协程中等待子进程结束并重启
+		go func() {
+			if err := cmd.Wait(); err != nil {
+				log.Printf("子进程 %d 异常退出: %v，正在重启...", i, err)
+				startChildProcess(i) // 递归重启
+			}
+		}()
+	}
+	// 启动和监控子进程
+	for i := range children {
+		startChildProcess(i)
+	}
+
+	// 主进程保持运行，但不处理连接
+	select {} // 阻塞主进程
+}