[GHC] #7714: The type of the second argument of poll() in GHC/Event/Poll.hsc is invalid

[GHC]

#7714: The type of the second argument of poll() in GHC/Event/Poll.hsc is invalid
-----------------------------+----------------------------------------------
Reporter:  kazu-yamamoto     |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  7.7               |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
-----------------------------+----------------------------------------------
 poll() is used in GHC/Event/Poll.hsc. The type of its second argument is
 nfds_t. nfds_t is defined unsigned long on Linux and unsigned int on
 Mac/FreeBSD. FFI in Poll.hsc uses CULong instead of (#type nfds_t).
 So, this may cause a problem on Mac/FreeBSD.

 Actually, a web server compiled by GHC head on FreeBSD sometime causes the
 following error:

 {{{
 mighty-head: c_poll: invalid argument (Invalid argument)
 mighty-head: sendWakeup: invalid argument (Bad file descriptor)
 mighty-head: sendWakeup: invalid argument (Bad file descriptor)
 mighty-head: sendWakeup: invalid argument (Bad file descriptor)
 }}}

 poll() on FreeBSD returns EINVAL when the specified time limit is
 negative.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7714>
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