From: Chris Morris <chrismo@...>
Date: 2003-02-06T23:19:59+09:00
Subject: Re: win32 + ctrl-c of child processes

> Ruby under Unix allows me to see if a child process died of a signal.
> E.g. ruby 1.8.0 I can check $?.signaled?.
>
> Unlike Unix, under Win32, $?.signaled? is not true when the child dies
> of Ctrl-C.
>
> Is this a known, fixable bug or a limitation of Windows?

I wrote this routine for my clutil win.rb lib[1], that calls spawnvp
asynchronously. The async call returns the process handle. "The return value
from a synchronous _spawnv or _wspawnv (_P_WAIT specified for mode) is the
exit status of the new process. ... The exit status is 0 if the process
terminated normally. ... If the new process did not explicitly set a
positive exit status, a positive exit status indicates an abnormal exit with
an abort or an interrupt."

So, maybe tweaking what I've done below for a sync call will give you a
suitable workraround for what you need -- though notice my comment about
segfaults -- I haven't tinkered with this on any newer versions
(1.6.8/1.8.0-preview)

P_WAIT        = 0
P_NOWAIT      = 1
OLD_P_OVERLAY = 2
P_NOWAITO     = 3
P_DETACH      = 4

def async_system(command)
  #
http://msdn.microsoft.com/library/en-us/vccore98/html/_crt__spawnv.2c_._wspa
wnv.asp
  # this is working -- but frequently Segfaults ruby 1.6.6 mswin32

  spawn = Win32API.new("crtdll", "_spawnvp", ['I', 'P', 'P'] ,'L')
  res = spawn.Call(P_NOWAIT, command, '')
  if res == -1
    Win32API.new("crtdll", "perror", ['P'], 'V').call('async_system')
  end
  res
end

[1] http://clabs.org/dl/clutil/clutil.2003.027.0.zip

Chris