[GHC] #5946: getAnyProcessStatus signals an exception

[GHC]

#5946: getAnyProcessStatus signals an exception
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    Reporter:  toc             |       Owner:                  
        Type:  bug             |      Status:  new             
    Priority:  normal          |   Milestone:                  
   Component:  libraries/unix  |     Version:  7.0.4           
    Keywords:                  |          Os:  Unknown/Multiple
Architecture:  x86_64 (amd64)  |     Failure:  Runtime crash   
  Difficulty:  Unknown         |    Testcase:                  
   Blockedby:                  |    Blocking:                  
     Related:                  |  
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Changes (by simonmar):

  * difficulty:  => Unknown


Comment:

 `Nothing` means "there are children but none of them have completed" (i.e.
 `waitpid()` returned 0), whereas the exception corresponds to `waitpid()`
 returning -1 and `ECHILD`.  So the behaviour closely models `waitpid()`.

 I think we should fix the docs.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5946#comment:1>
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