[GHC] #3128: hClose leaves file descriptor open if it fails

[GHC]

#3128: hClose leaves file descriptor open if it fails
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    Reporter:  Baughn            |        Owner:  simonmar        
        Type:  bug               |       Status:  new             
    Priority:  normal            |    Milestone:  6.12.1          
   Component:  libraries/base    |      Version:  6.10.1          
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by Baughn):

 I would like to add that Handles *should* contain an MVar (Maybe FD) or
 some such instead of just an FD. Or, rather, after a handle is hClosed -
 and the socket goes away - it ought to be impossible to use that handle
 for anything whatsoever.

 As it is now, it's possible for the FD to be reused, and for code that
 reuses the closed Handle to touch someone else's FD.

 This may not violate the haskell spec, but neither would code where you
 can't do that, and the cost would be trivial.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3128#comment:4>
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