From: "Christian Höltje" <redmine@...>
Date: 2010-04-28T22:47:38+09:00
Subject: [ruby-core:29845] [Bug #3215] Windows: IO.popen returns "handle is invalid"

Bug #3215: Windows: IO.popen returns "handle is invalid"
http://redmine.ruby-lang.org/issues/show/3215

Author: Christian H��ltje
Status: Open, Priority: Normal
ruby -v: ruby 1.9.1p376 (2009-12-07) [x64-mswin64_80]

This is with a VS8 compiled version of ruby.

Given this simple program (foo.rb):
----------->8---------cut--------8<------------
puts "*" * 20
p IO.popen('echo HI') {|f| f.readlines}
puts "*" * 20
----------->8---------cut--------8<------------


I get this:
----------->8---------cut--------8<------------
E:\test>bin\ruby.exe foo.rb
********************
The handle is invalid.
[]
********************

E:\test>
----------->8---------cut--------8<------------

Interestingly, if I redirect to a file, it works:
----------->8---------cut--------8<------------
E:\test>bin\ruby.exe foo.rb > q

E:\test>type q
********************
["HI\n"]
********************

E:\test>
----------->8---------cut--------8<------------

I'm not sure what is going on, but I know that the python group had similar problems in python < 2.6.... maybe we can crib their solution?

Ciao!

Python URLs:
  http://bytes.com/topic/python/answers/634409-subprocess-handle-invalid-error
  http://bugs.python.org/issue1124861 -- The patch is interesting.


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