[GHC] #13497: GHC does not use select()/poll() correctly on non-Linux platforms

[GHC]

#13497: GHC does not use select()/poll() correctly on non-Linux platforms
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8684, #12912     |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by nh2):

 Using `git grep "select("`, I've found uses of `select()` in:

 * `libraries/base/cbits/inputReady.c`
 * `rts/posix/Select.c`

 The first one I already knew about, the other one has 3 uses. 2 of those
 are with a 0-timeout (in which case there is no problem), and the one in
 `awaitEvent()` aims to block as long as possible, so that's not a problem
 either.

 The only occurrence of `poll(` is in the new code that carries the problem
 I mentioned (https://ghc.haskell.org/trac/ghc/ticket/12912#comment:4);
 this probably has to be fixed (both to not crash and to handle the fact
 that `poll()` may not update the timeout.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13497#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler