Format and remove 12.3.md spaces

zh/12.3.md

@@ -9,104 +9,104 @@
 
 ```Go
 
-	d := flag.Bool("d", false, "Whether or not to launch in the background(like a daemon)")
-	if *d {
-		cmd := exec.Command(os.Args[0],
-			"-close-fds",
-			"-addr", *addr,
-			"-call", *call,
-		)
-		serr, err := cmd.StderrPipe()
-		if err != nil {
-			log.Fatalln(err)
-		}
-		err = cmd.Start()
-		if err != nil {
-			log.Fatalln(err)
-		}
-		s, err := ioutil.ReadAll(serr)
-		s = bytes.TrimSpace(s)
-		if bytes.HasPrefix(s, []byte("addr: ")) {
-			fmt.Println(string(s))
-			cmd.Process.Release()
-		} else {
-			log.Printf("unexpected response from MarGo: `%s` error: `%v`\n", s, err)
-			cmd.Process.Kill()
-		}
+d := flag.Bool("d", false, "Whether or not to launch in the background(like a daemon)")
+if *d {
+	cmd := exec.Command(os.Args[0],
+		"-close-fds",
+		"-addr", *addr,
+		"-call", *call,
+	)
+	serr, err := cmd.StderrPipe()
+	if err != nil {
+		log.Fatalln(err)
 	}
+	err = cmd.Start()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	s, err := ioutil.ReadAll(serr)
+	s = bytes.TrimSpace(s)
+	if bytes.HasPrefix(s, []byte("addr: ")) {
+		fmt.Println(string(s))
+		cmd.Process.Release()
+	} else {
+		log.Printf("unexpected response from MarGo: `%s` error: `%v`\n", s, err)
+		cmd.Process.Kill()
+	}
+}
 ```
 
 - 另一种是利用syscall的方案，但是这个方案并不完善：
 ```Go
 
-	package main
-	 
-	import (
-		"log"
-		"os"
-		"syscall"
-	)
-	 
-	func daemon(nochdir, noclose int) int {
-		var ret, ret2 uintptr
-		var err uintptr
-	 
-		darwin := syscall.OS == "darwin"
-	 
-		// already a daemon
-		if syscall.Getppid() == 1 {
-			return 0
-		}
-	 
-		// fork off the parent process
-		ret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)
-		if err != 0 {
-			return -1
-		}
-	 
-		// failure
-		if ret2 < 0 {
-			os.Exit(-1)
-		}
-	 
-		// handle exception for darwin
-		if darwin && ret2 == 1 {
-			ret = 0
-		}
-	 
-		// if we got a good PID, then we call exit the parent process.
-		if ret > 0 {
-			os.Exit(0)
-		}
-	 
-		/* Change the file mode mask */
-		_ = syscall.Umask(0)
-	 
-		// create a new SID for the child process
-		s_ret, s_errno := syscall.Setsid()
-		if s_errno != 0 {
-			log.Printf("Error: syscall.Setsid errno: %d", s_errno)
-		}
-		if s_ret < 0 {
-			return -1
-		}
-	 
-		if nochdir == 0 {
-			os.Chdir("/")
-		}
-	 
-		if noclose == 0 {
-			f, e := os.OpenFile("/dev/null", os.O_RDWR, 0)
-			if e == nil {
-				fd := f.Fd()
-				syscall.Dup2(fd, os.Stdin.Fd())
-				syscall.Dup2(fd, os.Stdout.Fd())
-				syscall.Dup2(fd, os.Stderr.Fd())
-			}
-		}
-	 
+package main
+ 
+import (
+	"log"
+	"os"
+	"syscall"
+)
+ 
+func daemon(nochdir, noclose int) int {
+	var ret, ret2 uintptr
+	var err uintptr
+ 
+	darwin := syscall.OS == "darwin"
+ 
+	// already a daemon
+	if syscall.Getppid() == 1 {
 		return 0
-	}	
+	}
+ 
+	// fork off the parent process
+	ret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)
+	if err != 0 {
+		return -1
+	}
+ 
+	// failure
+	if ret2 < 0 {
+		os.Exit(-1)
+	}
+ 
+	// handle exception for darwin
+	if darwin && ret2 == 1 {
+		ret = 0
+	}
+ 
+	// if we got a good PID, then we call exit the parent process.
+	if ret > 0 {
+		os.Exit(0)
+	}
+ 
+	/* Change the file mode mask */
+	_ = syscall.Umask(0)
+ 
+	// create a new SID for the child process
+	s_ret, s_errno := syscall.Setsid()
+	if s_errno != 0 {
+		log.Printf("Error: syscall.Setsid errno: %d", s_errno)
+	}
+	if s_ret < 0 {
+		return -1
+	}
+ 
+	if nochdir == 0 {
+		os.Chdir("/")
+	}
+ 
+	if noclose == 0 {
+		f, e := os.OpenFile("/dev/null", os.O_RDWR, 0)
+		if e == nil {
+			fd := f.Fd()
+			syscall.Dup2(fd, os.Stdin.Fd())
+			syscall.Dup2(fd, os.Stdout.Fd())
+			syscall.Dup2(fd, os.Stderr.Fd())
+		}
+	}
+ 
+	return 0
+}	
 ```
 
 上面提出了两种实现Go的daemon方案，但是我还是不推荐大家这样去实现，因为官方还没有正式的宣布支持daemon，当然第一种方案目前来看是比较可行的，而且目前开源库skynet也在采用这个方案做daemon。