Bug #1052: When using File.open with seek and readpartial, pos isn't updated.
http://redmine.ruby-lang.org/issues/show/1052

Author: Kent Dahl
Status: Open, Priority: Normal
Reproducible Version: 1.8.7-p72

When using File.open in ruby 1.8.7 with seek and readpartial, pos doesn't work. 

If I seek and use readpartial on a file opened for reading, pos is not updated properly. Sample code:

File.open(filename){|f|
  f.seek 0  # Comment out this, and it works.
  f.readpartial(10)
  p f.pos # Expect 10, not 0.
}


Output:
ruby1.8 file_seek_pos_issue.rb => 0
ruby1.9 file_seek_pos_issue.rb => 10

System:
- ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
- ruby 1.9.0 (2008-06-20 revision 17482) [i486-linux]
- Ubuntu 8.10 (Linux wintermute 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 GNU/Linux)


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