[GHC] #9168: reading/writing blocking FDs over FD_SETSIZE is broken

[GHC]

#9168: reading/writing blocking FDs over FD_SETSIZE is broken
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        Reporter:  rwbarton          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  libraries/base    |          Version:  7.8.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by slyfox):

 Simplest "fix" (as done in non-threaded IOmanager):
 {{{
 --- a/libraries/base/cbits/inputReady.c
 +++ b/libraries/base/cbits/inputReady.c
 @@ -25,7 +25,9 @@ fdReady(int fd, int write, int msecs, int isSock)
         int maxfd, ready;
         fd_set rfd, wfd;
         struct timeval tv;
 -
 +       if ((fd >= (int)FD_SETSIZE) || (fd < 0)) {
 +           return -1;
 +       }
         FD_ZERO(&rfd);
         FD_ZERO(&wfd);
          if (write) {
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9168#comment:5>
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