golang 消息忽略 signal.Ignore(syscall.SIGHUP) 示例

短命女 2021-09-09 00:24 209阅读 0赞

**目录**

示例1： exec.Command 子进程调用 忽略消息 防止僵尸进程

示例2：管道调用中的 消息忽略

示例3：多个消息忽略

示例4：消息忽略 与 消息处理 同存

--------------------

消息具体含义参考：

《golang signal 信号处理》 [https://blog.csdn.net/whatday/article/details/118650161][https_blog.csdn.net_whatday_article_details_118650161]

### 示例1： exec.Command 子进程调用 忽略消息 防止僵尸进程 ###

func main() {
    	flag.Usage = usage
    	flag.Parse()
    	if flag.NArg() < 1 {
    		usage()
    	}
    
    	if isatty(1) {
    		dofile()
    	}
    
    	if isatty(2) {
    		os.Stderr = os.Stdout
    	}
    
    	signal.Ignore(syscall.SIGHUP)
    
    	args := flag.Args()
    	cmd := exec.Command(args[0], args[1:]...)
    	cmd.Stdin = os.Stdin
    	cmd.Stderr = os.Stderr
    	cmd.Stdout = os.Stdout
    
    	err := cmd.Run()
    	if err != nil {
    		fmt.Fprintln(os.Stderr, err)
    		if _, ok := err.(*exec.ExitError); ok {
    			os.Exit(126)
    		}
    		os.Exit(127)
    	}
    }

### 示例2：管道调用中的 消息忽略 ###

func childMain() error {
    	var err error
    
    	pipe := os.NewFile(uintptr(3), "pipe")
    	if pipe != nil {
    		defer pipe.Close()
    		if err == nil {
    			pipe.Write([]byte{DaemonSuccess})
    		} else {
    			pipe.Write([]byte{DaemonFailure})
    		}
    	}
    
    	signal.Ignore(syscall.SIGCHLD)
    
    	syscall.Close(0)
    	syscall.Close(1)
    	syscall.Close(2)
    
    	syscall.Setsid()
    	syscall.Umask(022)
    
    	// syscall.Chdir("/")
    
    	return nil
    }

### 示例3：多个消息忽略 ###

func InitSignalHandling() {
    	signal.Ignore(syscall.SIGTTOU, syscall.SIGTTIN)
    
    	signals := []os.Signal{syscall.SIGINT, syscall.SIGTSTP}
    	incoming = make(chan os.Signal, len(signals))
    
    	signal.Notify(incoming, signals...)
    
    	go broker()
    }

### 示例4：消息忽略 与 消息处理 同存 ###

func OnInterrupt(fn func(), onExitFunc func()) {
    	// deal with control+c,etc
    	signalChan := make(chan os.Signal, 1)
    	// controlling terminal close, daemon not exit
    	signal.Ignore(syscall.SIGHUP)
    	signal.Notify(signalChan,
    		os.Interrupt,
    		os.Kill,
    		syscall.SIGALRM,
    		// syscall.SIGHUP,
    		// syscall.SIGINFO, this causes windows to fail
    		syscall.SIGINT,
    		syscall.SIGTERM,
    		// syscall.SIGQUIT, // Quit from keyboard, "kill -3"
    	)
    	go func() {
    		for _ = range signalChan {
    			fn()
    			if onExitFunc != nil {
    				onExitFunc()
    			}
    			os.Exit(0)
    		}
    	}()
    }

[https_blog.csdn.net_whatday_article_details_118650161]: https://blog.csdn.net/whatday/article/details/118650161