[GHC] #11997: hSetFileSize zeroes file

[GHC]

#11997: hSetFileSize zeroes file
-------------------------------------+-------------------------------------
           Reporter:  jacereda       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  7.10.3
  libraries/base                     |
           Keywords:                 |  Operating System:  MacOS X
       Architecture:  x86_64         |   Type of failure:  Incorrect result
  (amd64)                            |  at runtime
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The following sequence:


 {{{
 cp /bin/echo /tmp/echo && ghc -e 'import System.IO' -e 'withFile
 "/tmp/echo" WriteMode (`hSetFileSize` 1000)'
 }}}

 results in /tmp/echo containing 1000 zeros. I would expect the truncated
 content as if truncate() was called.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11997>
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