[GHC] #13519: hWaitForInput does not work on linux.

[GHC]

#13519: hWaitForInput does not work on linux.
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           Reporter:                 |             Owner:  (none)
  junji.hashimoto                    |
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 hWaitForInput does not work on linux.
 When hWaitForInput has non-zero waiting time, it always fails.
 The code is following ghci-code.
 This is because inputReady.c
 (https://github.com/ghc/ghc/blob/ghc-8.0/libraries/base/cbits/inputReady.c#L27)
 does not allow 'msecs != 0'.

 {{{
 $ ghci
 GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
 Prelude> :m + System.IO
 Prelude System.IO> f <-openFile "stack.yaml" ReadMode
 Prelude System.IO> hWaitForInput f 10
 fdReady: msecs != 0, this shouldn't happenAborted (core dumped)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13519>
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