Hi,

>From: Daniel Berger <djberg96 / gmail.com>
>Reply-To: ruby-talk / ruby-lang.org
>To: ruby-talk / ruby-lang.org (ruby-talk ML)
>Subject: Setting $? manually - possible?
>Date: Sat, 29 Apr 2006 23:41:19 +0900
>
>Hi all,
>
>Ruby 1.8.4
>
>I'm working on a custom Process.waitpid method (for Windows).  It works 
>fine, except that I want to be able to set the Process::Status ($?) 
>manually within the method.  Specifically, the exitstatus and pid.  This is 
>pure Ruby, btw.
>
>The problem is that Process::Status.new has been undef'd within process.c 
>and $? has been set to readonly.
>
>I've tinkered with redefining Process::Status.new, a custom 
>Process::Status#initialize, instance_variable_set, etc - all to no avail.
>
>Is there any way to set $? from within Ruby?
>
Something like this is possible but not recommended.

require 'Win32API'

FIXNUM_FLAG = 0x01
rb_int2inum = Win32API.new('msvcrt-ruby18','rb_int2inum','L','L') # long -> 
VALUE
rb_iv_set  = Win32API.new('msvcrt-ruby18', 'rb_iv_set', 'LPL', 'V')

    system("ver")
p $?    # -> #<Process::Status: pid=920,exited(0)>
    obj = rb_int2inum.call($?.object_id) ^ FIXNUM_FLAG
    rb_iv_set.call(obj,"pid",rb_int2inum.call(1))
    rb_iv_set.call(obj,"status",rb_int2inum.call(0xFF00))
p $?    # -> #<Process::Status: pid=1,exited(255)>


Regards,
Park Heesob