[GHC] #4363: openFile sharing permissions are inconsistent across platforms

[GHC]

#4363: openFile sharing permissions are inconsistent across platforms
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    Reporter:  jystic            |        Owner:                             
        Type:  bug               |       Status:  new                        
    Priority:  normal            |    Milestone:                             
   Component:  libraries/base    |      Version:  6.12.3                     
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Windows           |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Comment(by simonmar):

 Replying to [comment:5 NeilMitchell]:
 > I've been bitten by this in practice several times, as has Max
 Bolingbroke. We have things where Haskell writes out a file which we than
 cat in to the file we really wanted to write to avoid this problem. It's
 even more annoying that it's done to satisfy the standard, but that on
 Linux you don't satisfy the standard and it's far more convenient. Windows
 is perfectly capable of doing what Linux does - I'd love it to be changed.

 I understand the inconvenience, but just wanted to point out that we do
 comply with the standard on Linux.  The difference is that on Linux we
 implement the locking ourselves, locally to the Haskell process.  We could
 have used `flock()` on Linux, and conversely, we could probably implement
 our own in-process locking on Windows (not that I think we should do
 this).

 Anyway, the current situation is both inconsistent and inconvenient, and I
 agree we should do something about it.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4363#comment:6>
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