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让 Ruby 程序成为守护进程？

发布于 2024-09-18 20:15:19 字数 72 浏览 6 评论 0原文

我想编写一个始终在我的 Mac 后台（守护进程）运行的 Ruby 程序。

有人能指出我如何做到这一点的正确方向吗？

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红衣飘飘貌似仙 2024-09-25 20:15:19

Ruby 1.9.x 现在具有以下功能：

Process.daemon

将其放入您的代码中即可。

摘自“Ruby 中的守护进程”。

Ruby 1.9.x has now the following:

Process.daemon

Put it in your code and that's it.

Taken from "Daemon Processes in Ruby."

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离笑几人歌 2024-09-25 20:15:19

使用 Daemonize.rb

require 'daemons'
Daemons.daemonize

非常简单的示例： http://github.com/utkarsh2012/backitup /blob/master/backitup.rb

如何安装守护进程 gem：

gem install daemons

Use Daemonize.rb

require 'daemons'
Daemons.daemonize

Very simple sample: http://github.com/utkarsh2012/backitup/blob/master/backitup.rb

How to install daemons gem:

gem install daemons

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东风软 2024-09-25 20:15:19

啊，谷歌来救援了！查看

http:// /fitzgeraldsteele.wordpress.com/2009/05/04/launchd-example-start-web-server-at-boot-time/

其中一位有用的博主提供了编写 launchd plist 来启动 ruby Web 的示例应用服务器。

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锦欢 2024-09-25 20:15:19

这是一个用于守护代码的模块。这是一个包装现有脚本的分支。

本质上它可以归结为这一点（来自 Travis Whitton 的 Daemonize.rb，上面的第一个链接，针对我多年前编写的一些程序进行了修改）：

private
# This method causes the current running process to become a daemon
# If closefd is true, all existing file descriptors are closed
def daemonize(pathStdErr, oldmode=0, closefd=false)
    srand # Split rand streams between spawning and daemonized process
    safefork and exit# Fork and exit from the parent

    # Detach from the controlling terminal
    unless sess_id = Process.setsid
        raise 'Cannot detach from controlled terminal'
    end

    # Prevent the possibility of acquiring a controlling terminal
    if oldmode.zero?
        trap 'SIGHUP', 'IGNORE'
        exit if pid = safefork
    end

    Dir.chdir "/"   # Release old working directory
    File.umask 0000 # Insure sensible umask

    if closefd
        # Make sure all file descriptors are closed
        ObjectSpace.each_object(IO) do |io|
            unless [STDIN, STDOUT, STDERR].include?(io)
                io.close rescue nil
            end
        end
    end

    STDIN.reopen "/dev/null"       # Free file descriptors and
    STDOUT.reopen "/dev/null"   # point them somewhere sensible
    STDERR.reopen pathStdErr, "w"           # STDOUT/STDERR should go to a logfile
    return oldmode ? sess_id : 0   # Return value is mostly irrelevant
end

# Try to fork if at all possible retrying every 5 sec if the
# maximum process limit for the system has been reached
def safefork
    tryagain = true
    while tryagain
        tryagain = false
        begin
            if pid = fork
                return pid
            end
        rescue Errno::EWOULDBLOCK
            sleep 5
            tryagain = true
        end
    end
end

This is a module to daemonize your code. Here's an offshoot that wraps an existing script.

Essentially it boils down to this (from Travis Whitton's Daemonize.rb, the first link above, modified for some program I wrote ages ago):

private
# This method causes the current running process to become a daemon
# If closefd is true, all existing file descriptors are closed
def daemonize(pathStdErr, oldmode=0, closefd=false)
    srand # Split rand streams between spawning and daemonized process
    safefork and exit# Fork and exit from the parent

    # Detach from the controlling terminal
    unless sess_id = Process.setsid
        raise 'Cannot detach from controlled terminal'
    end

    # Prevent the possibility of acquiring a controlling terminal
    if oldmode.zero?
        trap 'SIGHUP', 'IGNORE'
        exit if pid = safefork
    end

    Dir.chdir "/"   # Release old working directory
    File.umask 0000 # Insure sensible umask

    if closefd
        # Make sure all file descriptors are closed
        ObjectSpace.each_object(IO) do |io|
            unless [STDIN, STDOUT, STDERR].include?(io)
                io.close rescue nil
            end
        end
    end

    STDIN.reopen "/dev/null"       # Free file descriptors and
    STDOUT.reopen "/dev/null"   # point them somewhere sensible
    STDERR.reopen pathStdErr, "w"           # STDOUT/STDERR should go to a logfile
    return oldmode ? sess_id : 0   # Return value is mostly irrelevant
end

# Try to fork if at all possible retrying every 5 sec if the
# maximum process limit for the system has been reached
def safefork
    tryagain = true
    while tryagain
        tryagain = false
        begin
            if pid = fork
                return pid
            end
        rescue Errno::EWOULDBLOCK
            sleep 5
            tryagain = true
        end
    end
end

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