Stopping FSSM processes when ruby exits

Question

I'm working on a piece of code which monitors a directory and performs certain tasks when a new file is created in that directory. I'm using FSSM and my (simplified) code looks like this:

require 'fssm'

class FileWatcher

def initialize

    FSSM.monitor('./temp/', '**/*', :directories => true) do
        create do |base, relative|
            puts "Create called with #{relative}"
        end
    end
end
end

FileWatcher.new

The file monitoring aspect works well, but my problem is when I halt this script. What happens is the "file_monitor" process remains running. Eg this is after running and halting the script 3 times:

$ ps aux | grep file_watcher
root      3272  1.0  5.3   9760  6596 pts/0    Tl   00:11   0:02 ruby file_watcher.rb
root      3302  1.5  5.2   9760  6564 pts/0    Tl   00:14   0:02 ruby file_watcher.rb
root      3314  2.2  5.2   9764  6564 pts/0    Sl+  00:14   0:02 ruby file_watcher.rb

Ie there are 3 processes still running. So, how to clean up upon exit of the script?

Answer 1

在父进程中安装一个信号处理程序，该信号处理程序将在信号即将被信号杀死（SIGINT，SIGTERM，SIGQUIT，SIGHUP）时触发，然后依次向子进程（FSSM监视器）发送适当的信号。