From: Saynatkari <ruby-ml@...>
Date: 2005-03-31T09:20:27+09:00
Subject: Re: Getting process id of started process


In data 3/31/2005, "Joe Van Dyk" <joevandyk@gmail.com> ha scritto:
>I've attatched code and test code at
>http://rafb.net/paste/results/2Rj4rb87.html , if someone wants to take
>a look.  Hopefully it's clear about what I want to do.
>
>
>On Wed, 30 Mar 2005 14:57:51 -0800, Joe Van Dyk <joevandyk@gmail.com> wrote:
>> Say I want to start a long running shell process (and monitor that process).
>>
>>     def start_process
>>         @process_id = fork do
>>             Kernel.system "cat /dev/zero > /dev/null"
>>         end
>>     end
>>
>> However, @process_id doesn't contain the pid of the cat process.  How
>> can I capture the pid of that process?

Kernel#fork returns twice, once in the child (return value of
nil), once in the parent (returns the pid). Try a if/else block
and see if it works?

Re: $?, I think that is the only way to get the Process::Status
object. I do not think Process#wait(pid) returns immediately
though I may be wrong.

>> Thanks,
>> Joe

E