[ ruby-Bugs-1190 ] error using IO.popen on ruby19 (mingw)

Bugs item #1190, was opened at 11-12-2004 14:59
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=1190&group_id=426

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: gabriele renzi (riffraff)
Assigned to: Nobody (None)
Summary: error using IO.popen on  ruby19 (mingw)

Initial Comment:
calling #read on the IO object resulting from IO.popen always raise ERRNO::Einval:

>irb19 -r rbconfig
irb(main):001:0> io=IO.popen(Config::CONFIG["ruby_install_name"],'r+')
=> #<IO:0x29b58f8>
irb(main):002:0> io.close_write
=> nil
irb(main):003:0> io.read 1
Errno::EINVAL: Invalid argument
        from (irb):3:in `read'
        from (irb):3
irb(main):004:0> io.read
Errno::EINVAL: Invalid argument
        from (irb):4:in `read'
        from (irb):4

In 1.8.it returns an empty string ( "" ). 

Running:
ruby 1.9.0 (2004-12-11) [i386-mingw32]
compiled with:
gcc version 3.4.2 (mingw-special)
on windows xp pro SP2 
on athlon xp 2000+



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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=1190&group_id=426