IO#stat doesn't work in some cases on Windows
---------------------------------------------

                 Key: JRUBY-2665
                 URL: http://jira.codehaus.org/browse/JRUBY-2665
             Project: JRuby
          Issue Type: Bug
          Components: Core Classes/Modules
    Affects Versions: JRuby 1.1.2
         Environment: Latest JRuby 1.1.2+ on Windows
            Reporter: Vladimir Sizikov


Consider the two following cases:

1. jruby -e "rd, rw = IO.pipe; p rd.stat" # ==> -e:1: No such file or directory 
- No such file or directory - -1 (Errno::ENOENT)

2. jruby -e "p IO.new($stdin.fileno).stat" # ===> -e:1: No such file or 
directory - No such file or directory - -1 (Errno::ENOENT)

Both cases work fine under MRI:

1. ruby -e "p IO.new($stdin.fileno).stat"

#<File::Stat dev=0x0, ino=0, mode=020000, nlink=1, uid=0, gid=0, rdev=0x0, 
size=0, blksize=nil, blocks=nil, at
ime=Thu Jan 01 01:00:00 +0100 1970, mtime=Thu Jan 01 01:00:00 +0100 1970, 
ctime=Thu Jan 01 01:00:00 +0100 1970>

2. ruby -e "rd, rw = IO.pipe; p rd.stat"
#<File::Stat dev=0x3, ino=0, mode=010000, nlink=1, uid=0, gid=0, rdev=0x3, 
size=0, blksize=nil, blocks=nil, at
ime=Thu Jan 01 01:00:00 +0100 1970, mtime=Thu Jan 01 01:00:00 +0100 1970, 
ctime=Thu Jan 01 01:00:00 +0100 1970
>

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