Bug #2560: IO.read not always closes the file
http://redmine.ruby-lang.org/issues/show/2560

Author: Vladimir Sizikov
Status: Open, Priority: Normal
ruby -v: ruby 1.9.2dev (2009-11-12 trunk 25723) [i386-mingw32]

Consider the following:

File.open('test_file', 'wb') { |f| f.write 'abc' }
IO.read('test_file', 0, -1) rescue nil
File.unlink('test_file')

On Windows the unlink call fails with:
`unlink': Permission denied - test_file (Errno::EACCES)

This is due to fact that IO.read, invoked with invalid offset parameter does not close the opened file. But the documentation clearly states that:
"read ensures the file is closed before returning."

This causes two RubySpec failures for IO.read:

mspec -t r core\io\read_spec.rb
ruby 1.9.2dev (2009-11-12 trunk 25723) [i386-mingw32]
..........E..E..................E.

1)
An exception occurred during: after :each
IO.read raises an Errno::EINVAL when not passed a valid offset ERROR
Errno::EACCES: Permission denied - D:/work/jruby-dev/rubyspec.git/rubyspec_temp/io_read.txt
D:/work/jruby-dev/rubyspec.git/core/io/read_spec.rb:13:in `block (2 levels) in <top (required)>'
D:/work/jruby-dev/rubyspec.git/core/io/read_spec.rb:5:in `<top (required)>'
D:/work/jruby-dev/mspec.git/bin/mspec-run:8:in `<main>'

2)
An exception occurred during: after :each
IO#read can be read from consecutively ERROR
Errno::EACCES: Permission denied - D:/work/jruby-dev/rubyspec.git/rubyspec_temp/io_read.txt
D:/work/jruby-dev/rubyspec.git/core/io/read_spec.rb:100:in `block (2 levels) in <top (required)>'
D:/work/jruby-dev/rubyspec.git/core/io/read_spec.rb:88:in `<top (required)>'
D:/work/jruby-dev/mspec.git/bin/mspec-run:8:in `<main>'


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