From: Park Heesob <phasis68@...>
Date: 2006-06-13T15:39:23+09:00
Subject: Re: win32-open3 module: giving a name to a Process


Hi,

>From: "Jatinder Singh" <jatinder.saundh@gmail.com>
>Reply-To: ruby-talk@ruby-lang.org
>To: ruby-talk@ruby-lang.org (ruby-talk ML)
>Subject: Re: win32-open3 module: giving a name to a Process
>Date: Tue, 13 Jun 2006 13:39:38 +0900
>
>Hi,
>
>Now I need to create a process with a name(the process is an instance of
>webrick server).
>I can create a webrick instance using following command,(this is not a
>blocking call, it returns immediately..thats what I want)
>input, out, err, @pid = Open4.popen4('D:\ruby\bin\ruby
>C:\InstantRails\rails_apps\app1\script\server -p 3002')
>
>Now at later point of time I would like to kill this process which I can
>ofcourse do using
>Process.kill(9, @pid)
>
>It may very well happen that process was killed externally, hence in that
>case I am first finding out if process with @pid is still alive by calling
>Process.kill(0,@pid) (it gives an error it the process is not alive, which 
>I
>am catching)
>
>My assumption in above case is that the webrick instance I had created
>earlier using popen4 method is still running with @pid; it may very well
>happen that webrick instance was killed externally and @pid was taken up by
>some other process; this will result in killing of a innocent process.
>I was thinking if I could assign a name to a process and then later on 
>while
>killing, verify the name, then that would solve the problem.
>But how do I assign a name to a process while creating a process using
>popen4 method and then how do I find the pid of a process by name.
>
>
>Help is appreciated!
>
How about this:

def get_cmd(pid)
  require 'win32ole'
  procs = WIN32OLE.connect("winmgmts:\\\\.")
  procs.ExecQuery(
"SELECT CommandLine FROM Win32_Process WHERE ProcessId = #{pid} 
","WQL").each { |p|
    return p.CommandLine
  }
end

cmd = 'D:\ruby\bin\ruby C:\InstantRails\rails_apps\app1\script\server -p 
3002'
input, out, err, @pid = Open4.popen4(cmd)

if cmd == get_cmd(@pid)
  puts "Valid Process"
  Process.kill(0,@pid)
else
  puts "Invalid Process"
end



Regards,
Park Heesob